A device (10) that is mounted and used at one location on the body of a user, that has a detection unit (1) that detects information that corresponds to the movement of the user, and that measures the amount of the activity of the user on the basis of the information detected by the detection unit (1). When a plurality of devices (10) are mounted on the body of the user, information that is detected by the detection unit (1) of a self-device and that is associated with information that indicates an identified mounting site is transmitted to a movement identification unit (25) that identifies the movements of the user on the basis of the information that is detected by the respective detection device (1) of each of the plurality of mounted devices (10) and on the basis of information that indicates mounting site, and activity amount is corrected on the basis of the identified movements.
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