To perform the intensive stapling easy to be understand by a user.

Printing condition of the printing data is designated, and a printing command and data are generated on the basis of the document information and the setting information with an instruction to start the printing. A host device and an image forming device transmit and receive the printing command and the data. A control unit interprets the command, and judges right or wrong of the stapling in the printing condition, and in the case of YES, the control unit gives priority to a tray for stapling in search and designation. After a series of setting is done, the printing data accumulated in an image forming unit is converted, and a plotter unit forms a recording paper with an image on the basis of the image data. The recording paper formed with the image is carried to a finisher unit by a delivery unit. After confirming the image formation of the printing data over the whole pages and confirming the setting of the stapling, the recording papers on the tray are stapled at a stapling position, and conclusion of the processing over the whole number of copies is confirmed to conclude the processing.