A section in which a motion for adjusting the posture of a living body or an object is identified accurately. An information processing device (101) extracts a main motion section (111) and an adjustment motion section candidate (112) from an acquiring sensor (102) as illustrated in (1) to (3) ofFIG. 1. Next, the information processing device (101) calculates a relationship likelihood value that the adjustment motion section candidate (112) is an adjustment motion section for the main motion section (111) based on the feature amount of the main motion section (111) and the feature amount of the adjustment motion section candidate (112) as illustrated in (4) ofFIG. 1. Then, the information processing device (101) determines whether the adjustment motion section candidate (112) is an adjustment motion section for the main motion section (111) based on the calculated relationship likelihood value as illustrated in (5) ofFIG. 1.
