2. The information processing device according to claim 1 , wherein if the differential document filled in by a user is read in, the one or more processors merge filled-in content on the differential document with the filled-in content on the read-in document stored in the memory, and the one or more processors replace already-stored content with the content merged for storage.
2. The information processing device according to claim 1 , wherein if the differential document filled in by a user is read in, the one or more processors merge filled-in content on the differential document with the filled-in content on the read-in document stored in the memory, and the one or more processors replace already-stored content with the content merged for storage. 3. The information processing device according to claim 2 , wherein if a document filled in by a user and a differential document filled in by the user are read in, the one or more processors merge the filled-in content on the document filled in by the user with the filled-in content on the differential document filled in by the user.