A mobile communication system includes a base station that configures a plurality of cells. The plurality of cells include D2D supporting cell that supports D2D communication in which data communication is directly performed between terminals and D2D non-supporting cell that does not support the D2D communication. The base station transmits D2D information indicating that the D2D communication is permitted in the base station. Based on a measurement report received from a user equipment, the base station is further configured to perform handover of the user equipment from the D2D non-supporting cell to the D2D supporting cell, after receiving notification information from the user equipment indicating an interest in performing the D2D communication by the user terminal.