1. An image forming device comprising: a transporting unit for transporting a document sheet by sheet to a specified reading position; a document judgment unit for judging whether the document transported by said transporting unit is an electronically tagged printed matter that includes an electronic tag storing original image data; a printing paper judgment unit for judging whether there is an instruction for printing the original image data on an electronically tagged printing paper equipped with an electronic tag; a reading unit for reading the original image data from the electronic tag of the document which is judged as said electronically tagged printing matter by said document judgment unit, when said printing paper judgment unit judges that there is an instruction for printing on an electronically tagged printing paper equipped with a electronic tag; and a printing unit for printing the original image data on an electronically tagged printing paper equipped with an electronic tag, wherein the original image data is read by said reading unit, wherein said printing unit issues a blank paper as an output, when a document is judged not as an electronically tagged matter by said document judgment unit while said printing paper judgment unit judges that there is an instruction for printing on a printing paper equipped with a electronic tag.