Computer system using Multi-dimensional input device

An input device recognized by a camera and inputted as a control input of a computer system includes a grip part which a user can grip and a marker part which is coupled to the grip part and has a marker on the surface so that the rotation and position change of the input device can be calculated by extracting the position of the marker in an image collected through the camera. The computer system includes the input device; the camera which collects the image of the input device; a calculation device which processes various pieces of data; and an output device which outputs the data processed by the calculation device. The rotation and position change of the input device is calculated by extracting the position of the marker in the image of the input device, collected from the camera. The calculation device processes the data by using the rotation and position change of the input device as the control input.