1. An input device comprising: a keyboard having a large number of input keys; a touch pad provided in front of the keyboard; key input monitoring means for monitoring the key input from the keyboard; timer means for clocking a set time; display means for displaying the input state from the keyboard and touch pad; and control means for controlling the operation of the respective parts, wherein when the key input monitoring means detects the key input from the keyboard, the input from the touch pad is brought into an inhibit state and the timer means is driven, when there is another key input within the set time of the timer means, the set time is updated to start clocking again while the input inhibit state from the touch pad is maintained, and when there is no key input within the set time, the input inhibit state from the touch pad is released.