The present invention relates to a computer system. It includes a host machine device, a display and an optical fetch device. Said display is connected with said host machine device to make host machine device output data on the screen of said display, its surface inductive input device also can separate it into several regions, every region has several index points, every index point can represent code correspondent to said region, these index points can use specific optical fetch device to fetch data. Said optical fetch device is connected with the host machine device for fetching the above-mentioned index points, these index points can be processed by sand host machine.