An electronic device, comprising: a display unit; and a controller capable of: displaying, via the display unit, an image being reproduced a letterbox and subtitles wherein the letterbox is displayed when the aspect ratio of the image is different from the aspect ratio of the display, and wherein the subtitles are positioned at the letterbox; displaying, via the display unit, a pointer image that moves in response to a motion of a remote control on the display unit in a state where that the letterbox and the image are displayed on the display unit; displaying a guide image at between the letterbox and the image when the pointer image is located at a boundary portion between the letterbox and the image above a preset period of time; moving the guide image on the display unit according to the motion of the remote control; remove the letterbox from the display unit and enlarge the image to fill a region at which the letterbox has been displayed according to a moving distance of the guide image, wherein the subtitles is positioned at the enlarged image when the letterbox is removed from the display unit, wherein the controller is further capable of: moving the subtitles to a preset region according to a user request received from the remote control, wherein the preset region is a region where the letterbox has existed prior to removing the letterbox; redisplay the letterbox on the display unit when the subtitles is moved to the preset region, wherein the subtitles is positioned at the redisplayed letterbox when the letterbox is redisplayed again. a display unit; and a controller capable of: displaying, via the display unit, an image being reproduced a letterbox and subtitles wherein the letterbox is displayed when the aspect ratio of the image is different from the aspect ratio of the display, and wherein the subtitles are positioned at the letterbox; displaying, via the display unit, a pointer image that moves in response to a motion of a remote control on the display unit in a state where that the letterbox and the image are displayed on the display unit; displaying a guide image at between the letterbox and the image when the pointer image is located at a boundary portion between the letterbox and the image above a preset period of time; moving the guide image on the display unit according to the motion of the remote control; remove the letterbox from the display unit and enlarge the image to fill a region at which the letterbox has been displayed according to a moving distance of the guide image, wherein the subtitles is positioned at the enlarged image when the letterbox is removed from the display unit, wherein the controller is further capable of: moving the subtitles to a preset region according to a user request received from the remote control, wherein the preset region is a region where the letterbox has existed prior to removing the letterbox; redisplay the letterbox on the display unit when the subtitles is moved to the preset region, wherein the subtitles is positioned at the redisplayed letterbox when the letterbox is redisplayed again. displaying, via the display unit, an image being reproduced a letterbox and subtitles wherein the letterbox is displayed when the aspect ratio of the image is different from the aspect ratio of the display, and wherein the subtitles are positioned at the letterbox; displaying, via the display unit, a pointer image that moves in response to a motion of a remote control on the display unit in a state where that the letterbox and the image are displayed on the display unit; displaying a guide image at between the letterbox and the image when the pointer image is located at a boundary portion between the letterbox and the image above a preset period of time; moving the guide image on the display unit according to the motion of the remote control; remove the letterbox from the display unit and enlarge the image to fill a region at which the letterbox has been displayed according to a moving distance of the guide image, wherein the subtitles is positioned at the enlarged image when the letterbox is removed from the display unit, wherein the controller is further capable of: moving the subtitles to a preset region according to a user request received from the remote control, wherein the preset region is a region where the letterbox has existed prior to removing the letterbox; redisplay the letterbox on the display unit when the subtitles is moved to the preset region, wherein the subtitles is positioned at the redisplayed letterbox when the letterbox is redisplayed again. moving the subtitles to a preset region according to a user request received from the remote control, wherein the preset region is a region where the letterbox has existed prior to removing the letterbox; redisplay the letterbox on the display unit when the subtitles is moved to the preset region, wherein the subtitles is positioned at the redisplayed letterbox when the letterbox is redisplayed again.