Patent ID: 8260355

Claim:
A portable communication terminal that functions as a communication instrument by installing an identification recording medium having subscriber information recorded therein, comprising: an interface unit operative to communicate with an installed identification recording medium; an application acquiring unit operative to connect to a server designated by a first identification recording medium in response to the first identification recording medium being installed for the first time, and to acquire an application program to which a first identification information regarding the first identification recording medium is embedded by the server; a checking unit operative to check, when a second identification recording medium is installed after the first identification recording medium is removed from the interface unit, the first identification information embedded in the application program that was acquired before the second identification recording medium is installed against a second identification information embedded in the second identification recording medium; and a function restricting unit operative to restrict the use of at least a part of the functions of the application program that was acquired before the second identification recording medium is installed when the first identification information of the application program does not match the second identification information of the second identification recording medium.