A communication control method is used in a mobile communication system that supports cellular communication in which a data path passes through a core network, and D2D communication that is direct device-to-device communication in which a data path does not pass through the core network. The communication control method comprises: a transmission step of transmitting, by a first user terminal that camps on a cell of a first base station, a discovery-use signal related to the discovery of a proximal terminal be capable of a communication partner of the D2D communication; and a notification step of notifying, by a communication device, the first base station of interference information related to the received discovery-use signal in response to the communication device receiving the discovery-use signal.