A television receiver transmits channel information obtained based on a remote control signal from a television remote controller to an image processing device through an HDMI interface section. The image processing device receives the channel information through the HDMI interface section, subjects an image signal obtained from a television broadcasting radio wave corresponding to the channel information to high-quality image processing performed in a high-quality image processing section, and transmits the processed image signal to the television receiver through the HDMI interface section. The television receiver receives high-quality image data through the HDMI interface section, and displays a high-quality image expressed by the high-quality image data on an image display section.