The rasterizing speed for the print job #12 is the lowest at 50 meters/minute, among those for the print jobs #11 to #13. A speed of 50 meters/minute is lower than the maximum transport speed of the image forming apparatus 10, which is 80 meters/minute. Therefore, the print speed of the print jobs #11 to #13 is determined as 50 meters/minute.

FIG. 16 illustrates the result of management performed in units of print jobs to be printed on the same roll of rolled paper. In FIG. 16, the print speed of the print jobs #11 to #13 is determined as 50 meters/minute, and the total sum of the job execution times is 3 hours and 10 minutes (=03:10:00). Therefore, in the case of FIG. 15, the print end time of the print jobs #11 to #13 is ten minutes past twelve. Since it takes 30 minutes to replace the rolled paper #11, the print start time of the print job #14 in FIG. 15 is twelve forty.

While uncoated paper is designated as printing paper for the print job #14, coated paper is designated as paper for printing for the next print job #15. Therefore, only the print job #14 is allocated to a new roll of rolled paper #12.

The rasterizing speed for the print job #14 is 150 meters/minute. However, a speed of 150 meters/minute is higher than the maximum transport speed of the image forming apparatus 10, which is 80 meters/minute. Therefore, the print speed of the print job #14 is determined as 80 meters/minute. As a result, the job execution time of the print job #14 is 18 minutes and 45 seconds.