A distributed ledger node of an organization management support system includes a request unit configured to request a determination on participation to a business network from a node of another organization on a distributed ledger system when receiving a request for new participation to a business network from a node of a specific organization, and a management unit configured to collect a determination result of at least the node of the other organization, finally determine the participation on the basis of the collected result, and reply to the node of the specific organization with a result of the final determination.