When the fact that the display mode of motion picture data is a full screen mode is detected, the display control mode for sending a video signal generated by a graphics controller to an LCD is switched from a normal mode for sending the video signal to the LCD without interposition of a high quality video engine to a high quality mode for sending the video signal to the LCD with interposition of the high quality video engine. The high quality video engine enlarges the screen size of the video signal in either linear scaling mode or nonlinear scaling mode designated by a user. Scaling is validated only in the case were motion picture data are displayed in the full screen mode.