A body shape management system includes: a predicted body shape calculation unit configured to calculate, for each set period, a predicted body shape of a first user according to a first schedule of the first user stored in a database, the predicted body shape being a body shape estimated by predicting a change from a reference body shape of the first user; and a display control unit configured to display an avatar of the first user along with the first schedule on a monitor, the avatar representing the predicted body shape of the first user calculated for each set period by the predicted body shape calculation unit.