A display system includes a display device and an input device. The display device includes a display for displaying images, an image signal processor for displaying images on the display, and a receiver for receiving signals from the input device. The input device includes a detector that detects a target color at a partial area of the display so as to acquire target color information, a storage unit for storing registered color information, a color determination processor that carries out a color determination process for determining whether or not the target color information matches the registered color information so as to generate a color determination signal, and a transmitter for transmitting the color determination signal. The image signal processor carries out a color change process of sequentially changing target colors but suspends the color change process when the receiver receives the color determination signal.