An image processing apparatus comprises a connector to connect the apparatus to a network to which plural client terminals are connectable, an acceptor to accept a request from one client terminal, a processor to perform a process regarding the image data according to the accepted request, a registering unit to register the content of the performed process, a discriminator to discriminate, when the request is accepted, whether or not the content of the process according to the request has been registered, and a determinator to determine the process content when the request is accepted according to a discriminator's request. Thus, when the respective functions of the image processing apparatus are used from the client terminals, it is possible to increase operability and simplify user administration by making a display screen different and by limiting the function for each terminal.