| 摘要 |
PURPOSE:To immediately restore an input error by means of a user by holding a document file before update, a document file after update and an inputted key code, reproducing the document at arbitrary time and storing the document files at plural times from pre-update time to post-update time. CONSTITUTION:Pre-update document file data 200 consists of a cursor position 201 and document data 202. Post-update document file data 300 consists of a cursor position 301, the input number of key codes 302 and document data 303. Input key code storage data 400 consists of the maximum stored number of data 401 and a key code 402. Postreproduction is reproduction which is to return a system to the pre-update document from the post-update document, and pre-production is reproduction which advances the system to the post-update document from the pre-update document. Thus, arbitrary time from the pre- update document to the post-update document can be reproduced by using post- reproduction and pre-production. |
