An image forming apparatus comprises: a receiver which receives facsimile or print data file in a page description language, from an information processing apparatus; a spooler which stores the facsimile or print data file received therefrom, on the spooler itself; a converter which converts the facsimile or print data file stored on the spooler, to an image data format; a job generator which generates a job based on the obtained image data file; a facsimile transmitter; a printer; and a job controller which instructs the facsimile transmitter or the printer to perform facsimile transmission or printing according to the generated job, respectively. And the converter selects the facsimile or print data file among those stored on the spooler, based on the state of the printer and the state of the facsimile transmitter, before converting the facsimile or print data file to an image data format.