1. A display apparatus comprising: a display unit; an image receiving unit which receives an image signal from an image source; and an image processing unit which processes the image signal, controls the display unit to display a three-dimensional (3D) image based on the processed image signal, controls the display unit to display a plurality of selectable sub-images which are respectively based on different preset 3D information values, and corrects the 3D image displayed on the display unit based on a 3D information value of a selected sub-image.