Included are an outgoing call detection unit configured to detect an outgoing call from a first communication terminal to a second communication terminal, a connection control unit configured to cause the outgoing call detected by the outgoing call detection unit to arrive at the second communication terminal, a call duration measurement unit configured to measure a time from when a phone call is started, which is a duration of the phone call, between the first communication terminal and the second communication terminal, and a notification unit configured to transmit, when the duration measured by the call duration measurement unit exceeds a predetermined duration before the phone call ends, a predetermined notification to a third communication terminal.