A digital copier is provided with mechanism for reading images of both sides of an original, and mechanism for storing image data read by the reading mechanism in an area of an image memory in order, and when a predetermined signal is applied thereto, for storing image data in the next area by one area. The predetermined signal may be generated when a skip key is depressed. Therefore, since it is not necessary to read images which needs not to be recorded, the appearance of the recorded images on a record sheet is improved and the processing time is shortened. The digital copier may be also provided with mechanism for storing blank data in remaining areas in the image memory when a predetermined signal is applied thereto. The predetermined signal may be generated when an end key is depressed.