PROBLEM TO BE SOLVED: To provide a call control unit for efficiently eliminating the sender of an unwanted telephone call, and a call control system and a call control method.;SOLUTION: Whether a disconnection signal received from a receiving terminal side at the time of call disconnection processing is a first disconnection signal and a second disconnection signal is determined, and the type of the disconnection signal is stored as call history information together with the identifier of a transmitting terminal. When a call setting signal is received from a terminal, the call history information that defines the identifier of the terminal that has transmitted the call setting signal as a transmitting terminal identifier is read and it is determined whether to perform call setting on the basis of the number of calls in which a connection signal is a second connection signal in the read call history information.;COPYRIGHT: (C)2006,JPO&NCIPI
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