An information-processing apparatus comprises a graphics controller which generates a video signal, a video processing controller which improves an image quality with respect to the video signal generated by the graphics controller, a detecting unit which detects whether or not a display mode of a display device is a full screen mode, and a control unit which sets a display control mode to a high image quality mode when it is detected that the display mode is the full screen mode, and wherein the video signal from the graphics controller is transmitted to the display device via the video processing controller in the high image quality mode.