A storage unit previously stores a value indicating a change in a value for a body related to an activity by type or size, and uses the stored therein value indicating the change to predict a value indicating a change in a value for the Displays a user's body for each activity of the user (steps S161 to S171), and presents the value indicating the change as predicted (step S174). A value indicating a change that occurs when a prescribed activity is performed and a value that indicates a change that occurs when a prescribed activity is not performed are predicted. The storage unit previously stores a value indicating how the value for the user's body changes in type or size with respect to the user's activity. The storage unit stores values indicating how values for multiple people's bodies change in type or size with respect to activities of the multiple people. How the value for the user's body will change for each activity of the user can be predicted.
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