To provide a support system for diabetes prevention / diabetes treatment, which imposes no burden on users staying at home.

The support system for diabetes prevention / diabetes treatment has a database on the prevention of diabetes provided on a server of an Internet-connected agent and accessed by an individual who registers for the database in advance, and features information and telecommunication networks (Internet) which connect an individual terminal device and at least one out of a health management database server (provider), a terminal device at a medical institution, and a terminal device at a health service agent mutually.