In a printer network system including a client device and a server device connected to the client device via a network, the server device includes a virtual print processor unit which receives a request of a print job from an application unit of the client device and generates image data as intermediate data and job definition data that define print settings of the print job, and an exclusive access control unit which controls exclusively writing and reading of the image data and the job definition data. The client device includes an output condition control unit which determines one of output destinations meeting conditional information in accordance with predetermined rules. A delivering unit acquires the job definition data and the image data by communicating with the exclusive access control unit, selects a printer driver corresponding to the output destination, and transmits a print command to the printer driver.