Electronic apparatus and method

An electronic apparatus comprising:

• a first detection electrode group;
• a second detection electrode group including electrodes which are arranged adjacent to electrodes included in the first detection electrode group;
• a third detection electrode group including electrodes which are arranged adjacent to the electrodes included in the second detection electrode group;
• a rotating member configured to move among positions in which the rotating member faces the first to third detection electrode groups;
• a detection unit that detects electrostatic capacitances of the first to third detection electrode groups;
• a determination unit that determines a rotation direction, a rotation amount, or a rotation angle of the rotating member in accordance with the electrostatic capacitances of the first to third detection electrode groups and threshold values for the first to third detection electrode groups;
• a selecting unit that selects a smallest one of the electrostatic capacitances of the first to third detection electrode groups;
• and
• an updating unit that updates a reference value of one of the first to third detection electrode groups corresponding to the selected smallest one of the electrostatic capacitances using the selected smallest one of the electrostatic capacitances.