| 摘要 |
PROBLEM TO BE SOLVED: To make no expense for advertisement activity required, make member registration free from anxiety, and accumulate data for grasping mutual personal relations between members to be utilized. SOLUTION: In this system for receiving an introduction for membership accompanied with an electronic mail address of the third party from the member, the sponser has an electronic mail address, and introduction chain information in the every member the electronic mail address of the third party is collated with the accumulated electronic mail addresses when the third party is introduced, the mail address and the introduction chain information are registered as a new member when no consistent address exists, the presence of the corresponding third party in the chain information of an introducer is further collated when consistent, a loop of a chain is recognized when consistent, and rerecognition information is stored. |
