An acquisition unit receives a result of user's selection of an exercise. A time-available-for-operation calculation unit calculates a time available for operation for which an operation on an amount of remaining power of a secondary battery is possibly continued. The determination unit compares a measurement prediction time for which the selected exercise is measured and the time available for operation. When it is determined that the measurement prediction time is longer than the time available for operation, the notification unit notifies a user before the exercise is started.