Image forming apparatus with controller for controlling use of different print media

An image forming apparatus used for displaying print media information according to print data and selecting designated print media to print from kinds of print media, comprises a receiving section for receiving print data, a judging section for judging whether first print media has been designated by the print media information, a print media setting input section for being inputted print media setup information so as to set second print media when getting a judging result that first print media having being designated, a controller for forming image on the second print media indicated by the setup information of the print media according to the above print data when the described print media setting input section is inputted the print media setup information, and an informing section for urging to supply the second print media once detecting lack of the second print media during image forming of the controller.