A communication apparatus is provided. The communication apparatus includes an image read unit which reads image data from a transmission document; a tag read unit which wirelessly reads tag data stored in a wireless tag corresponding to the transmission document; an image data generation unit, if the tag data includes mark data indicating that a mark is to be added to the image data, generates composite image data by combining the image data and mark image data based on the mark data; and a transmission unit which transmits the composite image data as transmission document data to an external apparatus.