Patent ID: 7430544

Claim:
A method of executing an output image generating operation job that is requested from a client device in an output operation execution system that is connected with the client device via a network, the method comprises the steps of: (a) providing within the output operation execution system a paid operation queue for registering orders of paid operation jobs and a trial operation queue for entering an order of charge-free trial operation jobs; (b) receiving from the client device a request for execution of either a paid operation job or a trial operation job; (c) entering the requested operation job into either the paid operation queue or the trial operation queue; (d) selecting an operation job to be executed while giving priority to the paid operation jobs into the paid operation queue over the trial operation jobs into the trial operation queue; (e) generating image output data by executing the selected operation job, and storing the image output data into a storage device of the output operation execution system; (f) if the executed operation job is a paid operation job, the output operation execution system transferring the image output data to the client device without undesired modification; and (g) if the executed operation job is a trial operation job, the output operation execution system adds to the image output data a trial-job mark indicating that the image output data has been made by trial operation, and transferring the image output data to the client device.