1. An access control enforcing system, comprising an access control enforcing part enforcing an access control for subject information based on access control information indicating a control concerning an access to the subject information in accordance with a security policy, wherein said access control enforcing part further includes a requirement capability determining part determining whether or not a requirement to execute the access can be executed, the requirement indicated by the access control information, and wherein the access control is enforced for the subject information based on a determination result by the requirement capability determining part so as to satisfy the requirement.