A heartbeat index determination apparatus may include a pulse wave acquirer configured to acquire a plurality of pulse wave signals that are measured using light of different wavelengths； and a processor configured to measure wavelength-specific heartbeat index values from the plurality of pulse wave signals and determine that a wavelength-specific heartbeat index value that is obtained from the plurality of pulse wave signals a most number of times among the wavelength-specific heartbeat index values is a heartbeat index value of a user.
