A communication terminal including a terminal interface for communicating with a first facsimile terminal dedicated to using analog facsimile communications, an analog communication part for controlling the analog facsimile communications of the terminal interface, a storage part for storing image data received from the first facsimile terminal, and a network interface part for connecting to an IP network and transmitting the image data stored in the storage part to a second facsimile terminal at a transmission rate greater than the transmission rate of the analog facsimile communication.