A communication control method is applied to a mobile communication system that includes a base station, a user terminal configured to establish a connection with the base station, and a network including the base station and a network device configured to be an upper device of the base station, and that supports D2D communication that is direct device-to-device communication. The communication control method comprises: a step of acquiring, by the network, a load level of the base station; and a step of determining, by the network, whether to permit the D2D communication of the user terminal on a basis of the load level.