To determine a posture of a person from captured images.SOLUTION: The posture determination program is configured to cause a computer to execute a series of processing including: detecting feature points of identical or similar movement pattern in an image area corresponding to a person's body detected from each of multiple pick-up images; identifying a center of arc each drawing a traveling locus on the basis of the traveling locus of the detected feature points between pick-up images; and determining a posture of the person on the basis of the position of the identified center.SELECTED DRAWING: Figure 8
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