COMMUNICATION NETWORK, METHOD FOR COMMUNICATION, COMMUNICATION SYSTEM AND METHOD FOR SWITCHING COMMUNICATION SERVICE

摘要

PROBLEM TO BE SOLVED: To enable a provision of a service with the same number in a plurality of moving units or a single moving unit having a plurality of identifications between networks having a plurality of DBs. SOLUTION: A subscriber database (e.g. a home location register 40, a visitor location register 50 or the like) records identification numbers and activation information of communication terminal equipment 60. A plurality of subscriber database synchronize the activation information. Accordingly, services of originating and incoming or the like with the same number can be provided between the networks having the plurality of the subscriber data bases in the nets. Each subscriber data base has the identification number and its activation information. Accordingly, which net the communication terminal equipment (moving unit or the like) exists in can be discriminated. The respective subscriber databases respectively synchronize. Therefore, all communication systems can manage the matched subscriber information.