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Access control to resources is one of the most important technologies for supporting human activities in the digital space. To realize control two schemes were proposed: RBAC (role-based access control) and TRBAC (temporal role-based access control) by adding time constraints and role dependencies to RBAC. However, these methods are not effective for temporal activities because of maintenance costs and inadequacy in safeness. In this paper, we focus on a flexible and secure access control in the real space, by using relations with users and situations, and propose a novel access control which is effective for temporal activities.