When order processing for printing image data is carried out by recording the image data and an order file in an order processing recording medium, history of orders is managed by the recording medium so that the content of past orders can be confirmed or new ordering information can be generated by using the past order content, for example. A flag showing whether or not an order file describing the content of an order, such as the quantity and the size, should be processed in a laboratory (whether the file is valid or invalid) is recorded in the recording medium together with the order file. By judging this flag by using an image handling apparatus of an image processing system, only valid order files are processed.