A system provided in accordance with the present invention comprises a sever unit (100), which serves as an apparatus for processing information concerning a biological condition information, and a client unit (200), which serves as an information terminal of a provider of the information on the biological condition communicably connected to the server unit (100) via a network (300). The server unit (100) determines a composite index reflecting a plurality of metabolites indicative of the biological condition based on the information on the biological condition acquired from the client unit (200).