A display device with playback functionality includes: an image information extracting module for extracting image information from a storage medium, and processing the image information so as to generate and output a first setting image signal conforming with a specific format; an image processor for receiving the first setting image signal and performing picture quality processing so as to generate and output a second setting image signal conforming with the specific format; a display unit capable of receiving and displaying one of the first and second setting image signals conforming with the specific format; and a control unit for performing control such that the display unit receives one of the first and second setting image signals when a command is received, and the other of the first and second setting image signals when the command is not received.