Disclosed is a display device including a display unit to display at least 3D object having different depths, a touch sensor unit to sense a touch input on the display unit, a tactile feedback unit to generate a tactile feedback corresponding to the 3D object, and a processor to control these units. The processor enables a tactile feedback function. If the touch input is sensed, the processor determines whether or not a first touch position as a position of the sensed touch input is within a first display area of a first 3D object having a first depth. If the first touch position is within the first display area, the processor regulates the first depth to make a first surface of the 3D object coincide with a surface of the display unit, and generates a first tactile feedback corresponding to the 3D object.