supplied by the input unit into the image data every dot and a generating unit to generate the image data obtained by the converter to a recording device when print requests from a plurality of data output devices are simultaneously received the image based on the data from each of the data output devices is switched every predetermined unit and generated application_number US 72194596 A description embodiments of the invention will be described hereinbelow with reference to the drawings in fig1 reference numeral 100 denotes a scanner section as an image input apparatus for converting an original image into image data 101 a printer section which has cassettes of a plurality of kinds of recording papers and is used to print out the image data onto a paper by a print out command in each function hereinafter a construction including the scanner section 100 and the printer section 101 is called an image forming apparatus copying machine 1000 102 a display unit to electrically display the image data and 103 an image output control apparatus for switching an image output signal from each function to the printer section 101 or display unit 102 reference numeral 104 denotes a filing unit for recording the image data read by the scanner section 100 onto a storage medium 105 and for sending the image data stored in the storage medium 105 to the image output control apparatus 103 reference numeral 106 denotes a facsimile unit for compressing the image data obtained from the scanner section 100 to the data based on the standard mh mr mmr of the facsimile and transmitting the compressed data by using a telephone circuit 107 and for expanding the facsimile data transmitted through the telephone circuit 107 and.