Abstract: Provided are an apparatus and method for enhancing computer system security by applying a security polity to mobile user equipment. The apparatus includes a security policy monitor unit for switching a job environment of a user equipment to a secure job environment corresponding to a security policy so as to apply the security policy to the user equipment loaded into a system to which the security policy is applied; and a secure job environment providing unit for providing an execution environment based on the secure job environment via the user equipment. Accordingly, the security policy may be guaranteed to be continuously and securely applied while a job is performed in the system.