Communication apparatus, data rewrite method and data download method

A communication apparatus for receiving electronic data is connected via a network to a server that stores a conversion table that contains electronic data processing information. The communication apparatus includes a mail receiver that receives electronic data via the network, a determiner that determines whether or not the received electronic data is processible by the communication apparatus, and a controller that downloads the conversion table from the server and utilizes the conversion table to process the received electronic data when the determiner determines that the received electronic data is not processible by the communication apparatus. The processor further processes the received electronic data when the determiner determines that the received electronic data is processible by the communication apparatus.