COMMUNICATION SYSTEM AND COMMUNICATION METHOD

There is provided a communication system and a communication method of making available both a shared telephone number shared by multiple communication terminals and an individual telephone number dedicated to a user's own terminal in a single communication terminal. A shared managing unit 11 of a communication system 1 manages terminal identifiers 1 and 3 identifying each of a plurality of communication terminals 30a and 30b to which a shared telephone number is assigned in correlation with the shared telephone number. An individual managing unit 12 manages a terminal identifier 2 identifying a communication terminal 30b to which an individual telephone number is assigned is correlation with the individual telephone number. A user information managing unit 13 manages user information including base station information of communication terminals identified by the identifier every terminal identifiers 1, 2, and 3. A call control device 20 carries out call control of communication terminals 30b, to which the shared telephone number and an individual telephone number are assigned, using this information.