Abstract: A digital image forming system includes a digital copying machine and a portable telephone which can be carried independently of the digital copying machine and can communicate with the digital copying machine and other communication device. The digital copying machine includes a scanner section for converting document image as read into image data, image memory for storing the image data obtained from the scanner section and a main CPU for storing image data obtained from the scanner section into the image memory and reading the image data from the image memory to be transferred to the portable telephone. The portable telephone includes a memory for storing image data and a CPU for storing the image data as transmitted from the digital copying machine in the memory and transmitting the image data as read from the memory to other communication device.