A controller is provided that is configured to perform: obtaining information about shoes worn by a user when the user goes out; obtaining a moving distance on foot when the user goes out; managing the moving distance on foot in association with the shoes worn by the user when the user goes out; and proposing, to the user, replacement of the shoes worn by the user when an integrated value of the moving distance on foot associated with the shoes worn by the user when the user goes out is equal to or greater than a threshold value.