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; 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; and when 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, display a thumbnail image representing the predetermined gesture on the area, move a position of the thumbnail image being displayed based on a drag touch input, move the area to the moved position of the thumbnail image, and display an additional image representing the additional gesture on the partial area, set an additional gesture for at least a partial area in the image received from the rear side camera based on the touch input inputted on the image received from the rear side camera, when the gesture substantially identical to the predetermined gesture is recognized on the area and a gesture substantially identical to the additional gesture is recognized on the partial area in the image received from the rear side camera, capture an image using the rear side camera. 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; 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; and when 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, display a thumbnail image representing the predetermined gesture on the area, move a position of the thumbnail image being displayed based on a drag touch input, move the area to the moved position of the thumbnail image, and display an additional image representing the additional gesture on the partial area, control the rear side camera and the touch sensitive display unit; 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; and when 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, display a thumbnail image representing the predetermined gesture on the area, move a position of the thumbnail image being displayed based on a drag touch input, move the area to the moved position of the thumbnail image, and display an additional image representing the additional gesture on the partial area, set an additional gesture for at least a partial area in the image received from the rear side camera based on the touch input inputted on the image received from the rear side camera, when the gesture substantially identical to the predetermined gesture is recognized on the area and a gesture substantially identical to the additional gesture is recognized on the partial area in the image received from the rear side camera, capture an image using the rear side camera.