In case of forming images of a job, which includes color pages and black/white
pages, in order to constitute a system which can obtain pages of individually formed
images with a state in original page order by selectively using both a color image
formation apparatus and a monochrome image formation apparatus with a simple operation,
job contents are transferred to each of the color image formation apparatus and
the monochrome image formation apparatus when the job, which includes the color
pages and the black/white pages, is outputted from a computer. The color image
formation apparatus forms only images of color pages, and then an user sets the
color pages in an inserter. The monochrome image formation apparatus forms monochrome
images when pages are black/white and feeds sheets from the inserter when pages
are color.
