Abstract: Disclosed is a funding management and post-management system using an open platform, including: an investor terminal which accesses an open platform server system over a communication network, checks histories and current achievement statuses of milestones of companies, and inputs investment intentions; a company terminal which accesses the open platform server system over a communication network, registers company information and current achievement status of a milestone, and inputs whether funding is in progress; and the open platform server system which operates a homepage for providing the company information to the investor terminal and the company terminal accessed over a communication network, displays the current achievement status of the milestone of each company, makes public a funding situation of a company which has requested funding, extracts a potential investor who has registered a company which has started funding as an interest company, and performs crowdfunding while individually providing n