INPUT PAD SYSTEM

PROBLEM TO BE SOLVED: To widen the area of plotting of a key operation by respectively connecting plural contacts to 1st and 2nd sheet resistors respectively provided with a pair of terminals and selectively connecting these contacts and terminals when the resistors are depressed. SOLUTION: When a contact P2 of a resistor 11 is depressed by a pen and a voltage is supplied between terminals 13A and 13B, for example, the voltage corresponding to the X-coordinate of the node of contacts P2 and P7 corresponding to the resistor 11 is outputted and it is recognized that the contact P2 or P7 is depressed. When the contact P2 is depressed and a voltage is supplied between terminals 23A and 23B, the voltage corresponding to the Y-coordinate of the node of contacts Q1 to Q5 corresponding to a resistor 21 is outputted to the terminals 13A and 13B and it is recognized that any one of contacts Q1 to 5 is depressed. Therefore, by measuring the voltages at the terminals 13A and 13B and at the terminals 23A and 23B, it can be detected that the contact P2 is depressed. When other contacts P1 and P3 to P10 are depressed, it can be similarly detected as well.