| 摘要 |
A method and apparatus can set validity of the operation for a piece of information to be displayed on a display terminal, such as a displaying, scaling or underwriting operation, and to allow the operation of the displayed information responsive to the information indicating the validity. In the operation of a multi-window controlled screen, a desired screen can be easily displayed closest to the user. Moreover, the information displayed on a screen is divided into a constant unit, and the information indicating validity of the operation is caused to correspond to the divided unit. This information is separately displayed to the user as an icon. Then the overwriting, deleting, moving or scale changing operation, or the like, can be accomplished independently of one another so that a desired document can be easily made. If the invention is applied to an electronic mail system, the document can be easily overwritten.
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