An apparatus for transmitting a video signal includes a signal detector, a multiplexer and a transmitter. The signal detector detects the video signal from the source to determine whether the horizontal sync signal and the vertical sync signal of the video signal are independent or composite. The multiplexer generates a composite sync signal by combining the horizontal sync signal and the vertical sync signal with reference to timing characteristics of the horizontal sync signal and the vertical sync signal while the horizontal sync signal and the vertical sync signal are detected as independent signals, and passes the composite sync signal while the horizontal sync signal and the vertical sync signal are detected as the composite sync signal. The transmitter transmits the video signal with the composite sync signal to the destination via a media. A method for transmitting the video signal is also disclosed.