A method and an apparatus for mirroring a frame are provided. The method is suitable for a display device having a first storage unit and a second storage unit. In the present method, pixel values of a pixel row of the frame are read from the first storage unit and written into the second storage unit. Then, the pixel values of the pixel row of the frame are read from the second storage unit and written back to the first storage unit. When performing one of foregoing reading and writing steps, the pixel values of the pixel row are read or written in a reverse direction to mirror the pixel row. Finally, foregoing steps are repeated to mirror each pixel row of the frame, so as to mirror the entire frame.