A user equipment (UE) is provided. The UE supports D2D wireless communication and includes a communication module configured to communicate with at least one different UE, a non-transitory computer readable memory storage configured to store instructions, and at least one processor electrically connected to the communication module and the memory storage. The instructions, when executed by the UE, cause the processor to check whether an available first synchronization signal is detected, determine whether to operate as a first synchronization reference UE based on whether the first synchronization signal is detected, and transmit first system information comprising an intensity of transmission power and a second synchronization signal comprising a first synchronization identifier if the UE is determined to operate as the first synchronization reference UE.