A mechanism which can avoid, as much as possible, a difference of picture quality that is caused by restricting color printing according to an authority and forcedly performing monochromatic printing is provided. A mechanism which restricts the color printing according to the authority without deteriorating performance is also provided. The processing refers to a color restricting mode in user information or a color restricting mode in setting information. When the referred color restricting mode indicates “force”, if the user does not have the authority in which a color job can be printed, the job is forcedly converted into monochrome. In case of “analyze”, if the user does not have the authority in which a color job can be printed, the job is analyzed. If it is the color job, a forced monochromatic printing or print inhibition is performed.