Patent ID: 8266675

Claim:
An image processing apparatus capable of connecting, via a communication line, to an authentication server that memorizes first user account information and performs user authentication based on the memorized first user account information, the image processing apparatus comprising: a user information memorizing portion for memorizing access privilege information indicating authorization to use a function of the image processing apparatus for each user who has ever used the image processing apparatus; a user information deleting portion for automatically deleting at least one of the memorized access privilege information when the user information memorizing portion memorizes the access privilege information in excess of a predetermined value; an authentication request portion for requesting the authentication server to authenticate a user who desires to use the image processing apparatus; an access privilege information generating portion, when access privilege information of the user who is authenticated by the authentication server is not memorized in the user information memorizing portion, for automatically generating the access privilege information of the authenticated user to let the user information memorizing portion memorize the generated access privilege information; and a job control portion determining whether the function specified by the authenticated user is permitted or not based on the access privilege information corresponding to the authenticated user.