A network facsimile apparatus, including a LAN interface unit, a facsimile interface unit, a memory unit, and a control unit, transmits image information received as e-mail through a computer network to another facsimile apparatus through a public channel, stores an e-mail address of a backup transmission destination with respect to the facsimile transmission in a memory unit for storing e-mail addresses beforehand. When the facsimile transmission is completed, the network facsimile apparatus generates communication control information and prepares an e-mail message that indicates the communication control information therein to transmit the e-mail message to the backup transmission address stored in the memory unit. Accordingly, a user can easily and readily ensure the result of the facsimile transmission by receiving the e-mail from the network facsimile apparatus.