A display device which performs a video telephony is provided. The display device includes a photographing unit which photographs an image, a video telephony unit which performs a video telephony using an image photographed by the photographing unit, and a control unit which controls at least one of an operation of the photographing unit and an operation of the video telephony unit if a status of the photographed image meets a preset condition. Accordingly, power efficiency of a display device may be improved.