When an editing APP receives a print instruction while designating an image to be printer, a supporting program receives a specific parameter and processes intermediate image data, and a general-use printing program generates print data based on the processed intermediate image data and transmits the print data to a printer. On the other hand, when the editing APP receives a preview instruction while designating an image to be printed, the supporting program receives a specific parameter and processes intermediated image data. Then, the general-use printing program responds to the editing APP without transmitting print data to the printer.