In facsimile-communicating an original when the Internet selection state in an operation unit is set to "automatic selection", the original is communicated by selecting the e-mail-based Internet for an A4 original size, and the session-based Internet for a B4 or A3 original size. At the same time, the original information is transmitted in accordance with the transmission mode of its own apparatus, the encoding method determined based on the reception capability of a facsimile apparatus at a reception destination, and the receiving-side output original size and resolution.