Display apparatus and method are provided. The display apparatus may include a receiver for receiving an image; a grouper for analyzing the received image and grouping a plurality of frames of the received image based on the analysis; a depth allocator for determining at least two key frames from a plurality of frames grouped into at least one group, and allocating a depth per object in the determined key frames; and an image generator for generating a 3D image corresponding to other frames excluding the key frames based on a depth value allocated to the key frames. Hence, the display apparatus can allocate the depth value of a higher quality to the object in the frames of the received image.