At least one processor is configured to control transmission of infrared rays from an infrared transmitter. A signal reception unit is configured to receive waveform signals of the infrared rays received by an infrared receiver. The at least one processor is configured to measure pulses of a user who wears an earphone based on the waveform signals and to control a transmission pattern of the infrared rays from the infrared transmitter based on which of accuracy in measurement of pulses and power saving is prioritized.
