PROBLEM TO BE SOLVED: To provide a system capable of disclosing membership information including the number of descendant members who have sequentially joined by chain introduction starting from a member to the member via a computer network.;SOLUTION: An introduction history management system has means for: giving a member ID to create a QR code including the member ID and access information when affiliation access is accepted; creating a standby screen with the QR code to make the member download the screen; adding a member ID of an existing member in the QR code as an introduction parent ID to be stored in a member information table in performing the affiliation access by an input of the QR code; storing all chain parent IDs in an introduction history information table; and retrieving the number of descendant members by the introduction history information table, and retrieving information regarding the descendant members by the member information table to be displayed on a member terminal.;COPYRIGHT: (C)2014,JPO&INPIT
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