1. A display apparatus comprising: a receiver configured to receive a first image set; a storage configured to store a second image set having a size corresponding to the first image set; an image processor configured to receive the first image set and the second image set in units of frames and to use the first image set and the second image set to generate a final image set by receiving an entire portion of the second image set of one frame, detecting a region of the second image set, to be synthesized with the first image set, by using the received entire portion, after detecting the region, receiving only partial data, corresponding to the detected region, of the second image set of a next frame, and synthesizing the received partial data and the first image set to generate a final image set; and a display configured to display the generated final image set.