Patent ID: 7349697

Claim:
A mobile communication system comprising a mobile terminal and a subscriber information management apparatus that manages subscriber information, wherein said mobile terminal comprises: detecting means for detecting a simultaneous loading of a plurality of recording media onto the mobile terminal, each of the plurality of recording media storing a subscriber identity to be sent to said subscriber information management apparatus so that a location area information of the subscriber identity information is registered; and transmitting means for transmitting, when said detecting means detects at least two recording media, first subscriber identity information corresponding to a first recording medium which location area information has been already registered by said subscriber information management apparatus along with second subscriber identity information corresponding to a newly detected recording medium which location area information is not yet registered by said subscriber information management apparatus so that the location area information of the second subscriber identity information is associated with the first subscriber identification information and is registered, to said subscriber information management apparatus, and wherein said subscriber information management apparatus comprises: receiving means for receiving said first subscriber identity information along with said second subscriber identity information from said mobile terminal; and registering means for associating location area information of said second subscriber identity information with said first subscriber identity information and registering the location area information of said second subscriber identity information, whereby both of said first subscriber identity information and said second subscriber identity information are activated so that simultaneous communications using said first and second subscriber identity information are allowed to said mobile terminal.