An image processing device includes a plurality of printers (Pr1, Pr2, Pr3, Pr4, . . . ) and a plurality of client machines (PC1, PC2, PC3, PC4, PC5, . . . ). When requesting an image data processing to a printer other than the printer to which an image data processing has been requested firstly, the client machine checks the security level of the other printer to which the image data processing is to be requested before requesting the image data distribution processing to the other printer. When selecting another printer to which the image data distribution processing is to be requested, the security level in each printer is sufficiently considered.