| 摘要 |
PURPOSE: To cancel restoration processing even when the restoration processing is erroneously operated by storing the information of object editing processing when an editing file is restored into a state before the editing processing. CONSTITUTION: An UNDO buffer 5 successively stores series of editing processing information such as erasure or insertion in a first-in after-out stack system for each unit of editing processing, and when the restoration processing (UNDO) of the editing file to the state before the editing processing is performed, it is extracted. Besides, an UNDO-UNDO buffer 6 successively stores the editing processing information extracted from the UNDO buffer 5 in a first-in last-out stack system and when the editing processing of the editing file is performed, it is extracted. When the editing file is restored into the state before the editing processing, the information of object editing processing is stored in the buffer 6. Thus, even after the restoration processing is performed, based on this information, the editing file can be returned into the state before the restoration processing. |
