1. A communication apparatus comprising: an interface unit that reads out identification information regarding a communication carrier from a storage medium in which the identification information is stored; a communicating unit decides the communication carrier based on the identification information read out by the interface unit and making communication by using the decided communication carrier; an authenticating unit that makes an authentication by using the identification information read out by the interface unit; a control unit that enables a communicating operation by the communicating means according to a success in the authentication by the authenticating unit; and a display control unit that allows an authenticating display screen for making the authentication to be displayed onto a display apparatus, wherein the display control unit decides a display language based on the identification information read out by the interface unit and changes a display language of the authenticating display screen according to the decided language.