PROBLEM TO BE SOLVED: To accurately calculate individual heartbeat intervals.SOLUTION: Disclosed is a heartbeat interval specification program which causes a computer to execute processing comprising the steps of: acquiring a sensor signal generated based on a reflected wave of a detection wave transmitted toward the heart of a subject; specifying the heartbeat frequency on the basis of the acquired sensor signal; filtering the sensor signal on the basis of the specified heartbeat frequency; on the basis of feature points relating to the heartbeat in a filtering signal, which is obtained by the filtering, specifying the feature point relating to the heartbeat from among the plurality of feature points in the sensor signal; and calculating the heartbeat intervals on the basis of the specified feature point relating to the heartbeat.SELECTED DRAWING: Figure 4
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