Patent ID: 8392967

Claim:
An image forming system, comprising: an image forming apparatus configured to connect to a network; a directory server device configured to connect to the network and to include registration information data on at least one of a domain group and a domain user; an authorization information registration device configured to (i) acquire list data based on the registration information data on the at least one domain group and domain user from the directory server device, (ii) determine authorization information on the at least one domain group and domain user within the list data, and (iii) register the determined authorization information to a user-manager server device in association with at least one of the domain group and domain user as authorization information data; and the user-manager server device configured to connect to the network and to transmit, to the image forming apparatus, user-authorization information corresponding to a logged-in user to the image forming apparatus based on the authorization information data on the at least one of the domain group and the domain user, wherein the image forming apparatus is further configured to transmit authentication information corresponding to the logged-in user to the user-manager server device; the user-manager server device is further configured to transmit the received authentication information to the directory server device; and the directory server device is further configured to perform authentication of the logged-in user based on the authentication information and the registration information data on the domain user, and transmit an authentication result and user information corresponding to the logged-in user to the user-manager server device as the list data.