A conversion unit converts output data detected by an input device based on any one type of conversion table among a plurality of types of conversion tables. An output unit transmits the output data thus converted to a main processor via an interface. A switching unit receives, from the main processor via the interface, a mode switching signal for switching detection sensitivity. The conversion unit switches the conversion table for reference based on the mode switching signal. The conversion table is a bit conversion table for reducing the number of bits of the output data.