A selector selects a video signal from video signals input via any of a plurality of video input terminals, and outputs the thus-selected video signal. A plurality of video signal detection sections determine whether or not video signals are being supplied from the plurality of video input terminals. When a video signal is newly detected, a plurality of video signal determination sections determine a format of the video signal. A signal processing section performs, on the video signal output from the selector, signal processing in accordance with a result of the determination output from the signal determination sections. When the video signal is newly detected during a period in which no video signal is being supplied to the plurality of video input terminals, control means causes the selector to select the thus-detected video signal.