To enable it to shorten a time duration which requires data for an image formation based on common intelligence for transmission in the simulcast transmission case as opposed to a plurality of image forming devices connected through a network.

A FAX machine 2A comprises an EEPROM 7 which memorizes throughput intelligence on at least one FAX machine 2 of other FAX machines 2B, 2C, and 2D, a receiver 4a which receives the designation of the FAX machine 2 of a sending end, a retriever 4c which retrieves throughput intelligence on the EEPROM 7 to the FAX machine 2 about each of the FAX machine 2 of the sending end, and a functional controller 4d which transmits facsimile data of a mode based on a retrieved throughput intelligence and throughput of a self-FAX machine 2A.

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