To provide communication equipment, a method and system capable of performing data transmission in an appropriate format in accordance with the receiving capability of an external terminal device without needing a troublesome operation, and a storage medium.

The facsimile equipment 105 retrieves the communication capabilities of the opposite side terminal devices being immediate destination from a terminal capability storing part 210, and transmits facsimile data to the devices when the devices retrieved this time are not PCs but facsimile equipment (step S608 and S609). Meanwhile, when the devices retrieved this time are PCs (PC 103, etc.), the opposite transmission destination is attached to the transmission destination address, etc., of an e-mail header. After finishing retrieving the communication capabilities of all of the opposite side terminal devices, an e-mail is transmitted with multi-addresses to the opposite side terminal devices being the PCs (step S612 to S616).