An apparatus for displaying a double screen in a wide screen display device, the apparatus including a video interface to receive a first and a second video signal from a plurality of video signals according to a selection control signal, wherein each of the first and the second video signals have a general screen aspect ratio; a scaler to scale the first video signal to a resolution of a main screen and to scale the second video signal to a resolution of a subscreen with the general screen aspect ratio; and a control unit to output the selection control signal to display the double screen, control scaling of the first video signal and second video signal, and to simultaneously display the scaled first video signal on an area of a screen and the scaled second video signal on a portion of a remaining area of the screen.