The present invention relates to a SSO service method, and more particularly, requesting a target resource from an input module to a service providing module, requesting user authentication from the service providing module to the input module, and authenticating from the input module. Requesting a single sign on (SSO) service to the user; performing authentication by the authentication module; transmitting user authentication permission information from the authentication module to the input module; from the input module to the service providing module Requesting an Assertion Consumer Service (ACS), transmitting redirect information of a target resource from the service providing module to the input module, requesting a target resource from the input module to the service providing module, and the service providing module Transmitting the requested resource to the input module It involves the SSO service method. According to the present invention as described above, the security performance can be strengthened through more accurate information processing by subdividing and efficiently performing the authentication step, and the risk management function can be strengthened by linking the risk management system.
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