CONTENT USE SYSTEM

PROBLEM TO BE SOLVED: To solve the problem of a conventional communication terminal device in which specification of only one user to one communication terminal is considered. SOLUTION: The content user system comprises a management gateway server and a terminal device. The management gateway server receives a request of authentication using equipment identification information from the terminal device to perform authentication of the terminal device, the equipment identification information being retained in association with user identification information of two or more users, returns an authentication result to the terminal device, and acquires a group of user identification information associated with the equipment identification information, when the authentication result using the equipment identification information of the terminal device is affirmative, to perform user authentication. The terminal device transmits the request of authentication using the own equipment identification information, receives the authentication results, and inputs the user identification information to request authentication using the user identification information. COPYRIGHT: (C)2009,JPO&INPIT