To provide a digital copying machine which stores a binary image and a multi-values image in one image storage part by switching them at need.

This digital copying machine is provided with at least one function of an image read part 101, an image recording part 103, and a facsimile part 105 and an image storage part 104 where inputted image data is stored, and an inputted image is outputted as an visual image in accordance with each part and each function. When binary image data is stored in the image storage part 104, data is stored in the preliminarily set unit of picture element blocks as it is; but when multi-values image data is stored, data is encoded to a fixed length code in the same unit of picture element blocks as binary image data and is stored.