[Task] When data is printed to a printing device from a computer, the printing is approved or not approved according to the data contents.[Solution] A first control filter 23, which detects printing data output from a spooler 10, halts the printing task temporarily, and replicates the printing data, and a viewable image driver 20 which uses replicated printing data to create an image file, are provided. The image file is transmitted over a network 2 to a manager, and the manager views the image file and decides whether to perform printing on the printing device 4, and transmits a notification signal to this effect to the first control filter 23. The first control filter 23 performs printing control according to the notification signal from the manager.