A device can be used for a long period of time without increasing the size and weight, and a biological signal is surely measured. An aspect of the present invention includes acquiring, from a first sensor, a first biological signal related to a heartbeat of a subject, acquiring, from a second sensor, a second biological signal related to the heartbeat of the subject, detecting a first feature from the first biological signal acquired, setting a light emission control pattern based on a detection timing of the first feature and information indicating time correlation between the first biological signal and the second biological signal, and driving a light emitting element of the second sensor to perform intermittent light emission based on the light emission control pattern set.