3. The document processing apparatus according to claim 1 , further comprising: a display that displays the electronic document; and a display control unit that controls the display to display the modification at the second position distinguishably.
7. The document processing apparatus according to claim 3 , wherein if the annotation is removed from the electronic document, the storage unit retains the modified place information and the comment in the database and, wherein the display control unit controls the display to display the removed modification at the second position in response to a user input to display annotations that have been removed from the electronic document on the electronic document.