PURPOSE: A system for providing investment information of unlisted companies by using a social network and a method thereof are provided to use a business model, state information, and a milestone of a company as investment determination information by registering them and easily searching for them in a social network service type. CONSTITUTION: An investment information providing platform of unlisted companies using a social network includes a server system (10), a startup registration unit (100) storing state information, a milestone management unit (200) displaying an achievement degree, an SNS registration unit (300), an SNS display unit (400), and a category search unit (500). The server system is composed of a web server receiving personal information of investors and state information of a company by using wired/wireless communication network. The startup registration unit inputs the state information and stores it in a DE as a member company confirming the state information through a sub homepage accesses the server system. [Reference numerals] (10) Server system; (110) Item management unit; (120) Weight setting unit; (130) Renewal storing unit; (210) Milestone setting unit; (220) Milestone display unit; (300) SNS registration unit; (400) SNS display unit; (500) Category search unit; (600) Open trade management unit
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