The present invention relates to an investment management service system and method, and an investment management service system according to the present invention comprises: a user's terminal (120); a security provider's terminal (130); a financial institution terminal (140) for extracting an appraised value of a guarantee matched one-to-one with unique information of the guarantee; and an operating server (110) for storing and registering the user's information, the security provider's information, and information of the guarantee, generating multiple pieces of warranty condition adjustment information on the basis of pieces of warranty condition information received from the user's terminal (120), the security provider's terminal (130), and the financial institution terminal (140), and publicly announcing the multiple pieces of warranty condition adjustment information, in a list form on a web site, whereby stable investment can be induced and investment with a small amount of money can be revitalized.