A multiple-TV display channel setting method for synchronously a setting mapping relation between display channels and transmission channels to a first TV and a second TV is disclosed. The method includes setting the mapping relation between the display channels and the transmission channels to the first TV, allowing the first TV to display audio/video (A/V) signals transmitted over one of the transmission channels according to one of the display channels, wherein the display channel is mapped by the mapping relation onto the transmission channel; and transmitting the mapping relation to the second TV so that the second TV displays the A/V signals transmitted over the transmission channel according to the mapped display channels.