A dementia information output system according to an aspect of the present invention includes: an acquisition unit configured to acquire an amount of body motion of a user； a determining unit configured to determine a likelihood that the user is developing a mild dementia or the like on the basis of a variability degree that is a degree by which an amount of body motion varies over a plurality of days in each of a plurality of time periods； and an outputting unit configured to output dementia information indicating the likelihood determined by the determining unit.
