A mobile communication system includes a plurality of call-processing servers, a call processing management database that holds data necessary for call processing, and a network manager. The network manager comprises a node state recognition unit that recognizes states of the call-processing servers, and a control unit that determines the call-processing node that processes a call processing request based on the states. The call-processing server comprises a call processing request accepting unit that accepts a call processing request, an acquisition unit that acquires information of a mobile communication terminal related to the call processing request from the database, a call processing unit that performs call processing using the acquired information; and a call processing result storage unit that stores information of a result of the call processing in the database.