A display system including a display apparatus for displaying a first image and a second image, two first lenses and two second lenses is provided. When a viewer sees the display apparatus via one first lenses and one second lenses, and the first image as well as the second image are parallax images, the first and second images are respectively saw by different eyes of the viewer. When the viewer sees the display apparatus through the two first lenses, and the first image as well as the second image are not parallax images, the first image irrelevant to the second image is saw by the viewer. When the viewer sees the display apparatus through the two second lenses, and the first image as well as the second image are not parallax images, the second image irrelevant to the first image is saw by the viewer.