In a case where both a division management function which counts the number of pages printed for each division and a color management function which counts the only number of chromatically printed pages for each division are valid, an image forming device executes monochromatic printing even if a division to which a user belongs who has requested the printing is not determined, and executes color printing after the division to which the user belongs who has requested the printing is determined. Furthermore, the image forming device counts the number of monochromatically printed pages by a division undefined counter which is not associated with a specific division, and counts the number of chromatically printed pages by a division counter corresponding to the division to which the user belongs who has requested the printing.