a facsimile apparatus includes a document size detecting unit , a first image data generating unit , a size acquiring unit , a size comparing unit , a second image data generating unit , an image data transmitting unit , and a first transmission result outputting unit . the document size detecting unit detects a first size of a first document . the first image data generating unit generates first image data based on a first image on the first document . the size acquiring unit acquires a second size of a second document that can be received by a reception - side apparatus . the size comparing unit compares the first size with the second size . the second image data generating unit generates second image data for forming a second image on the second document from the first image data based on a comparing result of the size comparing unit . the image data transmitting unit transmits the second image data to the reception - side apparatus . the first transmission result outputting unit outputs exclusively a transmission result indicating a result of transmission of the second image data to the reception - side apparatus .