This information processing device (100) acquires pulse wave waveforms of each of a plurality of regions of a subject, said pulse wave waveforms being obtained by analyzing images of each region of the subject which are included in each of a plurality of captured images of the subject. The information processing device (100) calculates a first index value which indicates at least the degree of coincidence between any of the acquired pulse wave waveforms of each region of the subject. The information processing device (100) calculates a second index value which indicates at least the degree of coincidence between partial waveforms in the pulse wave waveform of any region of the subject, among the acquired pulse wave waveforms of each region of the subject. The information processing device (100) determines whether the pulse wave waveform of any region of the subject indicates arrhythmia, on the basis of the calculated first and second index values.
