Body shape management system, its control method, and control program

A method for controlling a body shape management system according to the present disclosure comprising:

• posting an avatar representing a future body shape of a first user in a chat room in association with a message posted by the first user in the chat room, the future body shape of the first user being his/her body shape expected after a lapse of a set period;
• extracting a message containing a predetermined content from a message posted for the first user by a second user different from the first user;
• and
• changing the future body shape of the avatar of the first user according to the content of the extracted message.

A non-transitory computer readable storage medium storing a control program for causing a computer to perform:

• a process for posting an avatar representing a future body shape of a first user in a chat room in association with a message posted by the first user in the chat room, the future body shape of the first user being his/her body shape expected after a lapse of a set period;
• a process for extracting a message containing a predetermined content from a message posted for the first user by a second user different from the first user;
• and
• a process for changing the future body shape of the avatar of the first user according to the content of the extracted message.