PROBLEM TO BE SOLVED: To provide a user of a communication service with a supplementary service (option) for automatically reviewing a contract content.;SOLUTION: Use history of a user of a communication service is recorded in advance, and, at a predetermined interval, an assumed fee by a currently-applied contract content for the next charging object period is compared with an assumed fee in the case where a call destination or communication destination callable/communicable at no fee or cut-rate fee as a contract content based on the use history of the user of the communication service is changed. If the likelihood that the assumed fee becomes less expensive is increased, the call destination, communication destination or contract content is automatically changed.;COPYRIGHT: (C)2011,JPO&INPIT
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