A display apparatus and method for processing an image in a display apparatus are provided. The display apparatus includes a display unit, a receiving unit which receives a frame image including a first image and a second image and sync information of the frame image, a determination unit which determines whether the frame image is consistent with a reference pattern using the sync information, and an image processing unit which, if the frame image is inconsistent with the reference pattern, adjusts the frame image based on a level of inconsistency, and a controlling unit which controls the display unit to display the adjusted frame image.