| 摘要 |
PURPOSE:To quickly control a picture for page switching of document information by providing a page designation table and holding document information, which is edited once up to the current page, and head position information of each page in the table. CONSTITUTION:A page designation table 20 is provided with a two-byte area for a head page number A and a three-byte register area for every page, and a two-byte pointer B1... to the text head position in the document information storage part 21 of each page and the one-byte settled frame number C1... of the page are stored in each register area. A frame provided in document information is discriminated by the frame number. The head page number A is the head page number of the pointer held in the table 20. If a changed page is already registered in the table 20, the position of the changed page is read out from the table 20 to directly determine a text position by a text position determining part 17, and virtual editing is unnecessary. If the changed page cannot be obtained from the table, page position information is set and registered in the table simultaneously with virtual editing. Thus, the overhead related to the setting processing of the table 20 is scarcely generated to keep the processing speed approximating conventional that.
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