A device for biorhythm detection, includes: a memory; and a processor coupled to the memory and configured to perform operations of: acquiring activity amount data indicating an amount of activity of a test subject which is measured by an activity amount meter configured to measure the amount of activity of the test subject; and detecting, as a frequency derived from a biorhythm of the test subject, a frequency that indicates peak power in a result which is obtained through frequency analysis of a first time waveform of the activity amount data.
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