Abstract: A function updating system and function updating method enabling a user to recognize what functions are installed in a mobile terminal of a communicating party, by automatically notifying the functions in the mobile terminal and updating the address book with the functions. When a mobile terminal (1A) makes a call to another mobile terminal (1B), the mobile terminal (1A) transmits information of functions available in the mobile terminal (1A) to a function notifying server (31), the function notifying server (31) generates icon information based on the function information, and transmits the icon information to the mobile terminal (1B), and the mobile terminal (1B) updates the address book with the icon information. When the mobile terminal (1B) does not have an icon corresponding to the updated function, the mobile terminal (1B) downloads the icon from an icon server (32).

Abstract: A function updating system and function updating method enabling a user to recognize what functions are installed in a mobile terminal of a communicating party, by automatically notifying the functions in the mobile terminal and updating the address book with the functions. When a mobile terminal (1A) makes a call to another mobile terminal (1B), the mobile terminal (1A) transmits information of functions available in the mobile terminal (1A) to a function notifying server (31), the function notifying server (31) generates icon information based on the function information, and transmits the icon information to the mobile terminal (1B), and the mobile terminal (1B) updates the address book with the icon information. When the mobile terminal (1B) does not have an icon corresponding to the updated function, the mobile terminal (1B) downloads the icon from an icon server (32).

Abstract: Information updating system and information updating method for transmitting updated information of information about a mobile terminal apparatus and/or user to a receiving-side terminal apparatus to enable the information of a calling-side terminal apparatus to be automatically updated.

Abstract: In a communication system having a plurality of cellular telephones connected on a communication network, and a switching apparatus that manages communication functions usable in the plurality of cellular telephones, when the switching apparatus receives a communication request from a cellular telephone on the calling side, the switching apparatus determines communication functions usable in the cellular telephone to notify a cellular telephone on the receiving side, while determining communication functions usable in the cellular telephone to notify the cellular telephone, and the cellular telephones and on the calling side and receiving side display the communication functions usable in the cellular telephone as the communicating party notified from the switching apparatus, while registering the communication functions usable in the cellular telephone as the communicating party after finishing communication, respectively.