Introduction service is supported, in order to activate and facilitate community activities. A community management center 1 searches for offered-service information that matches at least partly with an application designated by a coordinator terminal 2, and selects participants specified by detected offered-service information, as introduction candidates. Then, an introduction candidate list that describes private information, desired terms, and possessed value of ticket for each of the selected introduction candidates is displayed on a coordinator terminal 2. When the coordinator terminal 2 selects a participant to be introduced to the applicant, out of the introduction candidates described in the introduction candidate list, then, the private information and the desired terms of selected participant is displayed on a participant terminal 3 of the applicant.