A black stripe detector is configured to detect a black stripe region of an input video signal in which a part of an effective region is a black stripe region, and to generate black stripe information. A keystone correction processor is configured to implement keystone correction processing for the input video signal, and to generate a keystone-corrected video signal. A black stripe information corrector is configured to correct the black stripe information which indicates a corrected black stripe region owned by the keystone correction video signal, to corrected black stripe information based on keystone correction parameters when the keystone correction processor performs keystone correction processing for the input video signal. A video signal processor is configured to implement predetermined video signal processing for the keystone-corrected video signal by using the keystone-corrected video signal and the corrected black stripe information.