Patent ID: 8808146

Claim:
An activity meter comprising: an activity amount acquisition unit arranged and programmed to acquire an activity amount indicating an amount of physical activity of a user; an activity age acquiring unit arranged and programmed to acquire an activity age representing a standard age of a person who does a same amount of activity as the activity amount acquired in a unit period, using body information and a basal metabolic rate of the user; and an output unit arranged and programmed to output information relating to the activity age; wherein the activity amount acquisition unit includes at least one of an accelerometer, a pedometer, and a heart rate monitoring device; the activity age acquiring unit is arranged and programmed to compute the activity age in accordance with an arithmetic equation that uses the body information and the basal metabolic rate of the user; the arithmetic equation includes a coefficient; and the activity age acquiring unit is arranged and programmed to variably determine the coefficient such that a ratio between an amount of fluctuation in the basal metabolic rate and an amount of fluctuation in the activity age computed in response to the amount of fluctuation in the basal metabolic rate is a value in a predetermined range.