1. A writing apparatus to which a predetermined writer is connected, comprising: a writer configured to write, to a write object provided to a conveyed item conveyed in a conveying direction, at least identification information that identifies the write object based on stored identification information; a first reader provided downstream in the conveying direction from the writer and configured to read the identification information from the write object; a determiner configured to determine whether or not the identification information written to the write object and read by the first reader is consistent with the stored identification information to be written to the write object; a notifier configured to, when the determiner determines that the identification information written to the write object and read by the first reader is inconsistent with the stored identification information to be written to the write object, notify the predetermined writer of recovery information including at least one of the stored identification information to be written to the write object or a write content corresponding to the stored identification information to be written to the write object; a memory configured to store the stored identification information and the write content corresponding to the stored identification information so that a predetermined writing order can be identified; and a storage controller configured to, when consistency is determined by the determiner, store completion information indicating a normal write in the memory and associating it with the identification information read by the first reader that was determined to be inconsistent, wherein the writer writes at least the identification information based on the stored identification information in the predetermined writing order to a corresponding write object provided to each of a plurality of conveyed items conveyed in the conveying direction, and wherein, when the determiner determines that the identification information written to the write object and read by the first reader is inconsistent with the stored identification information to be written to the write object, the notifier notifies the predetermined writer of recovery information containing at least one of the stored identification information that is not associated with the completion information in the memory and has an earlier writing order or the write content corresponding to the stored identification information, as the stored identification information and the write content to be written to the write object.