PURPOSE: To set the outside shape and the arrangement of each key and an input code in accordance with each key arbitrarily by an operator by holding the correspondence of the group of a depression detecting point with the input code as a correspondence table in advance, and selecting and outputting the code in accordance with a key pad depressed in an input operation by using the correspondence table.

CONSTITUTION: The code can be allocated to the key pad 2 by fitting a dial 4d in a numeric value in accordance with the code to be set at the key pad 2 and depressing a code allocation button 4b as depressing the key pad 2. After that, when the group of a switch 1a turned on by depressing the key pad 2 by the operator is detected by a detector 3, an interpreter 4 selects a corresponding code from a detection result by referring to the correspondence table, and the code is inputted to a computer 5. Thereby, it is possible to set the outside shape and the arrangement of the key pad 2 and the correspondence with the input code arbitrarily by the operator oneself, and to perform a comfortable input operation in accordance with applications..