In a display device, an image may be three-dimensionally output by modifying a display area corresponding to an area selected based on a visual attribute of the image to be output on a display unit of the display device. The display device may include a display unit configured such that at least one portion of the display unit is modified, and a controller configured to display an output target image on the display unit and control to modify the display unit based on a visual attribute of a portion of the output target image. The controller may be configured to determine a modification target area in the output target image based on the visual attribute of components included in the output target image, and modify a display area of the display unit corresponding to the determined modification target area.