To uniformly control use authorization in a plurality of systems and to lessen maintenance works and further to prevent registration of error information.

A client 10 tries binding to a directory server 11 via a directory access portion 101. At this point, systems 12 and 13 recognize that identification of each system is cleared when succeeded binding to the directory server 11. The directory server 11 returns retrieved results at the basis of access controlling information 112 stored therein. The client 10 analyzes the retrieved results in an authorization decision unit 102 and decides that the only information indicating the function of a corresponding system properly read out and be utilizable for users, and the system 12 or the function D, which are decided to be utilizable, can be given to the users.