A communication apparatus includes: an interface for reading out identification information regarding a communication carrier from a storage medium in which the identification information is stored; a communication unit for deciding the communication carrier based on the identification information read out by the interface and making communication by using the decided communication carrier; an authentication unit for making an authentication by using the identification information read out by the interface; a control unit for enabling a communicating operation by the communication unit according to a success in the authentication by the authentication unit; and a display control unit for allowing an authenticating display screen for making the authentication to be displayed onto a display apparatus. The display control unit decides a display language based on the identification information read out by the interface and changes a display language on the authenticating display screen according to the decided language.