Display system and program

The present invention provides a display system configured to control a plurality of display devices by combining a plurality of information processing devices and the display devices, even if the display system includes a display device incapable of communicating a switch signal with all of the information processing devices.The present invention provides a display system comprising: first and second information processing devices; and first and second display devices, wherein the first and second display devices are configured to perform extended display with respect to one of an image output from the first information processing device and an image output from the second information processing device, the second information processing device is configured to output a second switch signal for switching an image displayed on the first display device to the first display device, and the first information processing device is configured to, when the second switch signal is output from the second information processing device to the first display device and the image displayed on the first display device is switched, output a first switch signal for switching an image displayed on the second display device to the second display device.