When an antenna which is favorable in receiving state is selected from among a plurality of antennas by an antenna selector, white noise is caused in a video signal by AGC characteristics of an AGC circuit in a tuner, and displayed on a display screen. A switching control unit exercises luminance altering control for a luminance altering unit on the basis of an output level difference or the like of the AGC circuit, lowers luminance of a white noise generating region only during a white noise generating interval, and thereby makes the white noise inconspicuous.