A display device includes a display unit configured to display an image; a sensor unit configured to sense an input to the display device and to generate an input signal according to a sensed result; and a processor, wherein the processor is further configured to: provide a user interface for editing the displayed image, divide the image into a first area and a second area if a first input signal is detected, determine any one of the first area and the second area as a variable area having variable visibility if a second input signal is detected, switch the variable area to an invisible state and display an indicator indicating the invisible state of the variable area if a third input signal is detected, and switch the variable area in the invisible state to a visible state if a fourth input signal is detected.