Communication apparatus providing communication by using stored identification information

A communication apparatus comprising:

• an interface unit constructed to read out communication carrier identification information from a storage medium which stores a plurality of information including the communication carrier identification information;
• a communicating unit constructed to perform communication by using a communication carrier;
• an authenticating unit constructed to perform an authentication;
• a control unit constructed to identify, based on the communication carrier identification information read out from the storage medium by the interface unit, the communication carrier for the communication performed by the communication unit and to control a communicating operation by the communicating unit in accordance with the communication carrier identified by the communication carrier identification information read out by the interface unit;
• and
• a display unit constructed to display an authenticating display screen for making the authentication,
• wherein the control unit decides a display language in accordance with the communication carrier identification information read out by the interface unit and generates a display signal of the authenticating display screen according to the decided display language.