A method of receiving a synchronization signal for device-to-device (D2D) communication by a user equipment (UE) in a wireless communication system is provided. A synchronization signal is received from a base station (BS) to acquire synchronization. Information on capability of the UE related with a synchronization mode is transmitted to the BS. Information on the synchronization mode indicating a first synchronization mode or a second synchronization mode is received from the BS. A reference synchronization of transmitting a D2D signal is determined based on the synchronization mode. When the information on the synchronization mode indicates the second synchronization mode, a synchronization signal is received from a device except for the BS to acquire synchronization for D2D communication.