To promote a service affiliate to spontaneously input data and to compute data useful for management according to the input data for offering the computed data to the service affiliate.

This institution management support system 1 inputting business data of a user and computing management support information by using the business data to offer it to the user is provided with a disclosure destination selection means 124 allowing individual users to disclose information about the business data, a computing object selection means 125 grouping a plurality of users, who are allowed to disclose the business data by the disclosure destination selection means 124, into one or more groups, a data input means 123 inputting the business data for a predetermined period, a computing means 126 computing the management support information by using the business data of each group, and an output means 128 outputting the management support information.