A digital copier being provided with a memory function which enables the operator to set a plurality of copying conditions in a single setting operation before copying operations are initiated so that the copying operations are performed in series or in parallel based on the individual copying conditions being set. Even when the copying operations are ongoing, the digital copier also enables the operator to change the setting of the copying conditions such as the number of copies, magnification for copying, and paper size, along with the sorting mode, so that the copying operations are performed based on the changed conditions thereafter. Accordingly, the setting of the copying modes for every copying mode, which has conventionally been required, is not necessary any more. This improves copying efficiency and also realizes flexible operation even when a plurality of copying modes are set, so that the copying function of the digital copier is significantly improved.