Call control of a mobile telephone device and so on used for a plurality of carriers (telephone lines) is provided for acquisition of carrier information and notification thereof to improve serviceability, wherein carrier information of a call destination is stored, carrier information is exchanged during the telephone call, and, when notified carrier information is different from stored carrier information, which is notified or a connection is suppressed. In addition, when a carrier of a call destination is not a specific carrier, after which is notified and carrier information of the call destination is also notified to an outgoing call side, a connection with the call destination is initiated at a request from the outgoing call side.