A method is provided for transmitting, by a User Equipment (UE), a Device-to-Device (D2D) signal in a Long Term Evolution (LTE) Time Division Duplex (TDD) system. The UE receives, from a Base Station (BS), information on a Timing Advance (TA). The UE acquires a timing of an uplink (UL) subframe by applying the TA and a predetermined timing offset to a timing of a downlink (DL) subframe. The UE transmits a D2D discovery signal in a first D2D subframe configured for a D2D link. A transmission timing of the first D2D subframe is determined by applying only the predetermined timing offset to the timing of the DL subframe.