Input device for controlling multiple computers and the controlling method thereof

An input device for controlling multiple computers, with each computer being connected to a monitor, comprising:

• a storing unit, recording identification of each one of the multiple computers;
• a sensing unit, detecting a displacement of the input device;
• a controlling unit, calculating a horizontal moving direction, a vertical moving direction, a horizontal displacement value of the horizontal moving direction, and a vertical displacement value of the vertical moving direction according to the displacement detected by the sensing unit, so as to determine a first computer of the multiple computers of which the input device is in control, and generating an input command for controlling the first computer, in which the input command comprises the identification of the first computer;
• and
• a transmitting unit, electronically connected to the controlling unit, transmitting the input command to the multiple computers to have the first computer corresponding to the identification executing the input command;
• wherein the horizontal moving direction corresponds to a latitudinal pointer direction of a first monitor connected to the first computer and the vertical moving direction corresponds to a longitudinal pointer direction of a first monitor connected to the first computer, in which the latitudinal pointer direction comprises a first latitudinal direction and a second latitudinal direction, the longitudinal pointer direction comprises a first longitudinal direction and a second longitudinal direction, wherein the controlling unit accumulates the horizontal displacement value to be a horizontal accumulated displacement value when the input device moves successively toward the first latitudinal direction and accumulates the vertical displacement value to be a vertical accumulated displacement value when the input device moves successively toward the first longitudinal direction, once the horizontal accumulated displacement value is larger than a horizontal threshold value and the vertical accumulated displacement value is larger than a vertical threshold value, the controlling unit switches the input device to control a second computer of the multiple computers, in which a second monitor connected to the second computer and the first monitor are not in the same horizontal axle or in the same vertical axle.