Patent ID: 8116251

Claim:
A mobile phone connected to a telephone network which uses a telecommunication line by way of a communication terminal comprising: a communication unit configured to transmit and receive data by wireless; a sound input unit and a sound output unit which are configured to input and output sound data respectively; a transmission interface unit connected to said communication terminal through a transmission medium and configured to transmit and receive data; a user information memory unit configured to store user information and constituted by being built-in or attached detachably; a memory unit configured to store a phone call program for utilizing a telephone service which is provided by said telephone network, the phone call program being an application for the communication terminal for connecting the mobile phone to the telephone network through the communication terminal; a detection unit configured to detect that an own apparatus and said communication terminal are connected mutually; and a control unit configured to transfer user information stored in said user information memory unit and the phone call program stored in said memory unit to said communication terminal through said transmission medium respectively and also configured to change over a sound data output destination of said sound input unit and a sound data input source of said sound output unit from said communication unit to said transmission interface unit respectively in a case when it is detected by said detection unit that the own apparatus and said communication terminal are connected mutually.