An image forming apparatus for a first purpose forms an image on a sheet, according to a sheet type. The image forming apparatus for the first purpose includes a conversion device and an image forming device. The conversion device converts second information for defining the sheet type in association with another image forming apparatus for a second purpose different from the first purpose, into third information of a same format as the first information for defining the sheet type in association with the image forming apparatus for the first purpose. The image forming device forms an image on the sheet P according to the third information, when the sheet P, the sheet type of which has been defined by the second information, is designated. The first information and the third information each define the sheet type more detailedly than the second information.