A device and method process graphics to be overlayed over video for three-dimensional display. The video includes a series of video frames updated at a video rate, including main video frames and additional video frames. A first buffer buffers a first part of the overlay information to be overlayed over the main video frames. A second buffer buffers a second part of the overlay information to be overlayed over the additional video frames. For each video frame, the first part of the overlay information or the second part of the overlay information is copied to a frame-accurate area copier. The first part of the overlay information or the second part of the overlay information is output according to whether a current video frame is a main video frame or an additional video frame. The first part of the overlay information and the second part of the overlay information are updated at an overlay rate. The overlay rate is different than the video rate.