The present invention relates to a display device in which, when a pointer reaches an area change detection zone in which a screen is divided into a first area and a second area, a first device receives a control command from a second device so that a first device and a second device having different Oss installed therein can be controlled by one input device such as a display device, a keyboard, and a mouse, and data can be transmitted or received between the first device and the second device.