A display device for providing a virtual reality service is provided. The display device includes: a display configured to display a stereoscopic image; a user interface configured to receive a user command for enlarging or shrinking the stereoscopic image; and a processor configured to adjust a three-dimensional effect for the stereoscopic image to correspond to the user command when the user command is input, and control the display to display an enlarged image or a shrunk image in which the three-dimensional effect is adjusted.