To provide a print ordering system including an image upload program and an image upload method including capable of executing print ordering through online in a general system configuration without making it necessary to sharply remake image processing software.

The image upload program is provided to make a computer function as a means for reading image data by referring to an upload list file preliminarily set as arguments, a means for connecting to a print service server designated by address information by using the communicating function of a computer, a means for transmitting image data to the print service server, a means for informing image processing software of the transmission result of the image data and a means for erasing the transmitted image data by referring to an erasure flag set as arguments. Thus, it is possible to realize online print ordering in a general system configuration.