A writing control system includes a display holding medium, a reading unit, an identifying unit, a control unit and a writing unit. The display holding medium includes a display section capable of displaying and holding an image in a no-power state and a storage section having a storage area for storing information that identifies an electronic document associated with it. The reading unit reads the information from the storage section when the display holding medium is located in a predetermined position. The identifying unit identifies the electronic document associated with the display holding medium, based on the information read from the display holding medium. When the electronic document associated with the display holding medium is not identified, the control unit performs control so that a page image, which has not been written, of an electronic document, which is used in last image writing, is set as a writing target.