A spool control device includes image data creation sections, a first measurement section, a spool section, a second measurement section, and a controller. Each of the image data creation sections interprets a page description language and creates a piece of image data acceptable by a printer. The first measurement section measures a creation speed with which the pieces of image data are created. The spool section spools the pieces of image data. The second measurement section measures an output speed with which the pieces of image data are output to the printer. The controller has first and second schemes of controlling an order in which the pieces of image data are written onto the spool section, selectively employs any of the first and second schemes on the basis of the creation speed and the output speed, and controls an order in which the pieces of image data are written.