User device, and control information transmitting method

This user device, used in a mobile communication system supporting D2D communication, is provided with: a broadcast channel information transmitting unit which transmits, using a D2D broadcast channel, configuration information of a resource for reception of D2D control information by another user device, and information indicating that the D2D control information is to be transmitted; and a control information transmitting unit which transmits the D2D control information using the resource.