A display system is provided. The display system includes a virtual reality display apparatus, an autostereoscopic display apparatus, and a host. In response to a processing unit of the host receiving a specific input signal, the processing unit generates a display-mode control signal, executes an image-conversion software development kit of an OpenVR driver to convert a virtual-reality (VR) stereoscopic image, that is generated by a VR application executed by the host, into an autostereoscopic image, and writes the autostereoscopic image to a second image buffer of the host. In response to the display-mode control signal, the autostereoscopic display apparatus is switched to an autostereoscopic display mode, and a multiplexing circuit of the host selects the autostereoscopic image stored in the second image buffer as an output image signal, and sends the output image signal to the autostereoscopic display apparatus for displaying.