Display apparatus and control method therefor

A display apparatus comprising:

• a display;
• a mixer;
• an information processor;
• a main processor configured to provide, to the information processor, area information for a video frame;
• a video processor configured to output the video frame;
• and
• a graphic processor configured to output a graphic frame,
• wherein the information processor is configured to:
• generate first transparency information corresponding to first area information for a video frame output from the video processor, and
• provide the first area information for the video frame and the first transparency information to the mixer,
• wherein the mixer is configured to:
• adjust a transparency of an area of the graphic frame received from the graphic processor based on the first area information and the first transparency information provided by the information processor, and
• output, on the display, an image overlapping the video frame received from the video processor and the graphic frame comprising the area having the adjusted transparency based on the first transparency information corresponding to the first area information of the video frame.