1. A display device, comprising: a rear side camera configured to sense an image positioned at a rear side of the display device; a touch sensitive display unit configured to be positioned at a front side of the display device and display at least one or more images; and a processor configured to control the rear side camera and the touch sensitive display unit, the processor is further configured to: display an image received from the rear side camera on the touch sensitive display unit, set an area on which a predetermined gesture is to be recognized based on a touch input, if a gesture substantially identical to the predetermined gesture is recognized on the area in the image received from the rear side camera, capture an image using the rear side camera.