A portable cellular phone terminal device having a communication function for communicating via a network and at least one accessory function in addition to the communication function, said portable cellular phone terminal device comprising: (a) a reading section for reading user information of a user who has contracted for cellular phone services provided by a cellular phone service provider, from a storage media that stores the user information and is configured to be detachable; (b) a control section for restricting utilization of the at least one accessory function depending on whether the user is under contract with a cellular phone service provider, and in accordance with a type of service as a contract class respectively associated with the read user information; (c) a terminal information storage section for storing self-provided information about the device itself; (d) a notification section for notifying an information transmitting center managed by said cellular phone service provider of the user information stored in said storage media and the self-provided information about the device itself; and (e) a receiving section for receiving utilization restricting information about restricting utilization of the at least one accessory function from said information transmitting center, the utilization restricting information defined depending on whether the user is under contract with a cellular phone service provider, and in accordance with a type of service as the contract class respectively associated with the user information and the self-provided information about the device itself; (f) wherein said control section is adapted to restrict utilization of the at least one accessory function according to the utilization restricting information. (a) a reading section for reading user information of a user who has contracted for cellular phone services provided by a cellular phone service provider, from a storage media that stores the user information and is configured to be detachable; (b) a control section for restricting utilization of the at least one accessory function depending on whether the user is under contract with a cellular phone service provider, and in accordance with a type of service as a contract class respectively associated with the read user information; (c) a terminal information storage section for storing self-provided information about the device itself; (d) a notification section for notifying an information transmitting center managed by said cellular phone service provider of the user information stored in said storage media and the self-provided information about the device itself; and (e) a receiving section for receiving utilization restricting information about restricting utilization of the at least one accessory function from said information transmitting center, the utilization restricting information defined depending on whether the user is under contract with a cellular phone service provider, and in accordance with a type of service as the contract class respectively associated with the user information and the self-provided information about the device itself; (f) wherein said control section is adapted to restrict utilization of the at least one accessory function according to the utilization restricting information.