A pedometer includes an activity amount acquisition unit that acquires an activity amount of a user, an index acquisition unit that acquires an index relating to the activity amount, and an index output unit that outputs the acquired index. The index acquisition unit includes an activity age acquisition unit that acquires an activity age represented by a standard age of a person who does the same amount of activity as the activity amount acquired in a unit period, using body information of the user, and acquires an index enabling the active age to reach a target activity age, based on the acquired activity amount.
