A display system includes a display device with a display section. A display-data providing device provides a display control signal containing display data to the display device. The display-data providing device stores display data to be provided to the display device and information corresponding to the display data in association with each other. The display device holds the corresponding information associated with the display data provided from the display-data providing device. If the display data is lost from the display device, and if the display-data providing device identifies the display content indicated by the corresponding information contained in the display-data identifying signal output by the display device, the display device erases the display content according to a second inverted erase signal sent from the display-data providing device, and the second inverted erase signal includes the display data corresponding to the display content identified by the display-data providing device.