A user terminal has a function of device-to-device (D2D) communication, and determines whether it is in a radio resource control (RRC) idle mode, receives a system information block (SIB) broadcasted by the base station in the RRC idle mode, where the SIB includes resource information indicating usable radio resource and power information for controlling transmission power used in transmitting data to other user equipment by the D2D communication, and determines radio resources and power used to transmit the data based on the resource and power information. In another aspect, a base station is configured to broadcast the SIB.