Server apparatus and internet facsimile apparatus and communication terminal capability exchanging method

In a server apparatus, a registration processing section analyzes a capability information transmission mail received by an E-mail communication section, and extracts capability information. Next, a sender's address and capability information are made to correspond to each other so to be stored in a capability information table. When a normal E-mail is received, designation capability information, which has been made to correspond to the recipient address, is obtained from the capability information table, and an image file which is attached to the received E-mail is converted to an image file to be suitable for designation capability information. This makes it possible to control a load applied onto internet facsimile apparatuses and to exchange capability between the internet facsimile apparatuses.