Electrodes of a sensor unit are fewer than segments; and, are arranged so that at least one electrode has an overlapping portion in each segment. An element data configuration part repeats processing of correcting a number m of provisional element data on the basis of predetermined information determined in accordance with an electrode pattern and a segment pattern on an operation surface so that a number n of provisional detection data calculated from the number m of provisional element data on the basis of the predetermined information approach a number n of detection data output from a capacitance detection part.