A multi-screen display control device includes a plurality of graphics processing units (GPUs) and a watchdog chip. The GPUs transform image data that a host transfers to the multi-screen display control device through a universal serial bus (USB) interface into a plurality of high-definition multi-media interface (HDMI) sub-images to be displayed by a plurality of screens. The watchdog chip is coupled to the GPUs and, when any of the GPUs crashes, the watchdog chip outputs a reset signal to reset all of the GPUs.