SCHEDULE 13G  
  
Amendment No. 4  
CMG Information Services Incorporated  
Common Stock  
Cusip # 125750109  
 
 
Cusip # 125750109  
Item 1:	Reporting Person - FMR Corp. - (Tax ID:  04-2507163)  
Item 4:	Commonwealth of Massachusetts  
Item 5:	804,100  
Item 6:	None  
Item 7:	1,171,800  
Item 8:	None  
Item 9:	1,171,800  
Item 11:	12.88%  
Item 12:	HC   
  
  
 
 
Cusip # 125750109  
Item 1:	Reporting Person - Edward C. Johnson 3d   
Item 4:	United States of America  
Item 5:	None  
Item 6:	None  
Item 7:	1,171,800  
Item 8:	None  
Item 9:	1,171,800  
Item 11:	12.88%  
Item 12:	IN   
  
 
 
Cusip # 125750109  
Item 1:	Reporting Person - Abigail P. Johnson   
Item 4:	United States of America  
Item 5:	None  
Item 6:	None  
Item 7:	1,171,800  
Item 8:	None  
Item 9:	1,171,800  
Item 11:	12.88%  
Item 12:	IN   
  
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS  
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)  
  
  
Item 1(a).	Name of Issuer:  
  
		CMG Information Services Incorporated  
  
Item 1(b).	Name of Issuer's Principal Executive Offices:  
  
		187 Ballardvale Street, Suite B110  
		Wilmington, MA  01887-2125  
  
Item 2(a).	Name of Person Filing:   
  
		FMR Corp.  
  
Item 2(b).	Address or Principal Business Office or, if None, Residence:  
  
		82 Devonshire Street, Boston, Massachusetts  02109  
  
Item 2(c).	Citizenship:  
  
		Not applicable  
  
Item 2(d).	Title of Class of Securities:  
  
		Common Stock  
  
Item 2(e).	CUSIP Number:    
  
		125750109  
  
Item 3.	This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) and the
 person filing, FMR Corp., is a parent holding company in accordance with 
 Section 240.13d-1(b)(ii)(G).  (Note:  See Item 7).  
  
Item 4.	Ownership  
  
	(a)	Amount Beneficially Owned:	1,171,800  
  
	(b)	Percent of Class:	12.88%  
  
	(c)	Number of shares as to which such person has:    
  
	(i)	sole power to vote or to direct the vote:	804,100  
  
	(ii)	shared power to vote or to direct the vote:	None  
  
	(iii)	sole power to dispose or to direct the disposition of:	1,171,800  
  
	(iv)	shared power to dispose or to direct the disposition of:	None  
  
  
 
 
Item 5.	Ownership of Five Percent or Less of a Class.  
  
	Not applicable.  
  
Item 6.	Ownership of More than Five Percent on Behalf of Another Person.  
  
	Various persons have the right to receive or the power to direct the receipt 
of dividends from, or the proceeds from the sale of, the common stock of CMG 
Information Services Incorporated.  The interest of one person, Fidelity 
Management Trust Company, a bank as defined in Section 3(a)(6) of the 
Securities Exchange Act of 1934, in the common stock of  CMG Information 
Services Incorporated, amounted to 761,000 shares or 8.36% of the total  
outstanding common stock at December 31, 1996.  
  
Item 7.	Identification and Classification of the Subsidiary Which Acquired 
the Security Being Reported on By the Parent Holding Company.  
  
	See attached Exhibit(s) A, B, and C.  
  
Item 8.	Identification and Classification of Members of the Group.  
  
	Not applicable, see attached Exhibit A.   
  
Item 9.	Notice of Dissolution of Group.  
  
	Not applicable.  
  
Item 10.	Certification.  
  
	By signing below I certify that, to the best of my knowledge and belief, the
 securities referred to above were acquired in the ordinary course of 
business and were not acquired for the purpose of and do not have the effect
 of changing or influencing the control of the issuer of such securities and
 were not acquired in connection with or as a participant in any transaction  
having such purpose or effect.  
  
  
Signature  
  
	After reasonable inquiry and to the best of my knowledge and belief, I 
certify that the information set forth in this Schedule 13G in connection with
 FMR Corp.'s beneficial ownership of the common stock of CMG Information 
Services Incorporated at December 31, 1996 is true, complete and correct.   
  
  
  
	February 14, 1997	  
Date  
  
  
  
	/s/Arthur S. Loring  
Signature  
  
  
  
	Arthur S. Loring, Vice President	  
Name/Title  
  
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS  
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)  
  
	Pursuant to the instructions in Item 7 of Schedule 13G, Fidelity Management
 & Research Company ("Fidelity"), 82 Devonshire Street, Boston, Massachusetts
 02109, a wholly-owned subsidiary of FMR Corp. and an investment adviser 
registered under Section 203 of the Investment Advisers Act of 1940, is the
 beneficial owner of 410,800 shares or 4.51% of the common stock outstanding 
of CMG Information Services Incorporated ("the Company") as a result of acting
 as investment adviser to various investment companies registered under 
Section 8 of the Investment Company Act of 1940, and as a result of acting
 as sub-adviser to Fidelity American Special Situations Trust ("FASST").    
  
	FASST is a unit trust established and authorized by the Department of Trade
 and Industry under the laws of England.  The investment adviser of FASST is 
Fidelity Investment Services Limited, an English company and a  subsidiary of 
Fidelity International Limited ("FIL").  
  
	Edward C. Johnson 3d, FMR Corp., through its control of Fidelity, and the 
funds each has sole power to dispose of the 367,700 shares owned by the Funds.
  
	Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR Corp., has the
sole power to vote or direct the voting of the shares owned directly by the 
Fidelity Funds, which power resides with the Funds' Boards of Trustees.  
Fidelity carries out the voting of the shares under written guidelines 
established by the Funds' Boards of Trustees.  
  
	FIL, FMR Corp., through its control of Fidelity, and FASST each has sole 
power to vote and to dispose of the 43,100 shares held by FASST.  
  
	Fidelity Management Trust Company, 82 Devonshire Street, Boston, 
Massachusetts 02109, a wholly-owned  subsidiary of FMR Corp. and a bank as 
defined in Section 3(a)(6) of the Securities Exchange Act of 1934, is the  
beneficial owner of 761,000 shares or 8.36% of the common stock outstanding 
of the Company as a result of its  serving as investment manager of the 
institutional account(s).    
  
	Edward C. Johnson 3d and FMR Corp., through its control of Fidelity Management
 Trust Company, each  has sole voting and dispositive power over 761,000 shares
 of common stock owned by the institutional account(s) as  reported above.  
  
	Members of the Edward C. Johnson 3d family and trusts for their benefit are 
the predominant owners of  Class B shares of common stock of FMR Corp., 
representing approximately 49% of the voting power of FMR Corp.   Mr. Johnson
 3d owns 12.0% and Abigail Johnson owns 24.5% of the aggregate outstanding 
voting stock of FMR  Corp.  Mr. Johnson 3d is Chairman of FMR Corp. and 
Abigail P. Johnson is a Director of FMR Corp.  The Johnson  family group and
 all other Class B shareholders have entered into a shareholders' voting 
agreement under which all  Class B shares will be voted in accordance with
 the majority vote of Class B shares.  Accordingly, through their  ownership
 of voting common stock and the execution of the shareholders' voting 
agreement, members of the  Johnson family may be deemed, under the Investment
 Company Act of 1940, to form a controlling group with  respect to FMR Corp.    
  
	Fidelity International Limited, Pembroke Hall, 42 Crowlane, Hamilton, 
Bermuda, and various foreign-based  subsidiaries provide investment advisory 
and management services to a number of non-U.S. investment companies  (the 
"International Funds") and certain institutional investors.  Fidelity 
International Limited is also the beneficial  owner of 43,100 shares or 0.47%
 of the common stock outstanding of the Company owned by FASST.  Additional  
information with respect to the beneficial ownership of Fidelity International
 Limited is shown on Exhibit B, page 1.  
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS  
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)  
  
  
	Pursuant to instructions in Item 7 of Schedule 13G, this Exhibit has been
 prepared  to identify Fidelity  International Limited, Pembroke Hall, 42 Crow 
Lane, Hamilton, Bermuda, a Bermudian joint stock company  incorporated for an 
unlimited duration by private act of the Bermuda Legislature (FIL) and an 
investment adviser to  various investment companies (the "International Funds")
 and certain institutional investors, as the beneficial owner  of 43,100 shares
 or 0.47% of the common stock outstanding of CMG Information Services 
Incorporated owned by  FASST.  
  
	Prior to June 30, 1980, FIL was a majority-owned subsidiary of Fidelity 
Management & Research Company  (Fidelity), a wholly-owned subsidiary of FMR 
Corp.  On that date, the shares of FIL held by Fidelity were  distributed, as 
a dividend,  to the shareholders of FMR Corp.  FIL currently operates as an 
entity independent of  FMR Corp. and Fidelity.  The International Funds and 
FIL's other clients, with the exception of Fidelity and an  affiliated company
 of Fidelity, are non-U.S. entities.
  
	A partnership controlled by Edward C. Johnson 3d and members of his 
family owns shares of FIL voting  stock with the right to cast approximately 
47.22% of the total votes which may be cast by all holders of FIL voting  
stock. Mr. Johnson 3d is Chairman of FMR Corp. and FIL.  FMR Corp. and FIL are
 separate and independent  corporate entities, and their Boards of Directors 
are generally composed of different individuals.  Other than when  one serves 
as a sub adviser to the other, their investment decisions are made 
independently, and their clients are  generally different organizations.  
  
	FMR Corp. and FIL are of the view that they are not acting as a "group" 
for purposes of Section 13(d) under  the Securities Exchange Act of 1934 (the 
"1934" Act) and that they are not otherwise required to attribute to each  
other the "beneficial ownership" of securities "beneficially owned" by the 
other corporation within the meaning of  Rule 13d-3 promulgated under the 1934
Act.  Therefore, they are of the view that the shares held by the other  
corporation need not be aggregated for purposes of Section 13(d). However, FMR 
Corp. is making this filing on a  voluntary basis as if all of the shares are 
beneficially owned by FMR Corp. and FIL on a joint basis.  
  
	FIL may continue to have the International Funds or other accounts 
purchase shares subject to a number of  factors, including, among others, the 
availability of shares for sale at what FIL considers to be reasonable prices 
and  other investment opportunities that may be available to the International 
Funds.  
  
	FIL intends to review continuously the equity position of the 
International Funds and other accounts in the  Company.  Depending upon its 
future evaluations of the business and prospects of the Company and upon other
developments, including, but not limited to, general economic and business 
conditions and money market and stock  market conditions, FIL may determine to
 cease making additional purchases of shares or to increase or decrease the  
equity interest in the Company by acquiring additional shares, or by disposing 
of all or a portion of the shares.  
  
	FIL does not have a present plan or proposal which relates to or would
 result in (i) an extraordinary  corporate transaction, such as a merger, 
reorganization, liquidation, or sale or transfer of a material amount of 
assets  involving the Company or any of its subsidiaries, (ii) any change in 
the Company's present Board of Directors or  management, (iii) any material 
changes in the Company's present capitalization or dividend policy or any other
material change in the Company's business or corporate structure, (iv) any 
change in the Company's charter or by- laws, or (v) the Company's common stock
becoming eligible for termination of its registration pursuant to Section  
12(g)(4) of the 1934 Act.  
  
	  FIL, FMR Corp., through its control of Fidelity, and FASST each has 
sole power to vote and to dispose of  the 43,100 shares held by FASST.    
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS  
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)  
RULE 13d-1(f)(1)  AGREEMENT  
  
	The undersigned persons, on February 14, 1997, agree and consent to the 
joint filing on their behalf of this  Schedule 13G in connection with their 
beneficial ownership of the common stock of CMG Information Services 
 Incorporated at December 31, 1996.  
	FMR Corp.  
	By	/s/Arthur S. Loring  
Arthur S. Loring 
Vice President - Legal  
	Edward C. Johnson 3d  
	By	/s/Arthur S. Loring  
Arthur S. Loring 
Under Power of Attorney dated 5/17/89 
On File with Schedule 13G for 
Airborne Freight Corp. 9/10/91   
  
	Abigail P. Johnson  
  
  
	By	/s/Arthur S. Loring  
Arthur S. Loring 
Under Power of Attorney dated 1/5/96 
On File with Schedule 13G for 
Acclaim Entertainment Inc. 1/10/96  
	Fidelity Management & Research Company  
	By	/s/Arthur S. Loring  
Arthur S. Loring 
Sr. V.P. and General Counsel  
	Fidelity Management Trust Company  
	By	/s/Frank V. Knox  
Frank V. Knox 
Vice President and Ethics  
and Compliance Officer  
at FMR Co.  
under Resolution of The  
Board of Directors dated  
July 19, 1995