A mirror display system and a mirror display method are present. The mirror display system comprises a transporting device and a receiving device. The mirror display method comprises following steps of: establishing a network connection with a receiving device at the transporting device; loading a plurality of contents; transforming the plurality of contents into a plurality of display data; transporting the plurality of display data to the receiving device via network; merging the plurality of display data into an output display data at the receiving device; transporting the output display data to a display unit for displaying. This application allows user to watch current screens of execution of the contents of the transporting device via a single display unit.