| 摘要 |
A CAD apparatus includes a layer displaying unit and an editing unit. The layer displaying unit displays elements included in each of layers that form graphic data onto a display unit in a superposed manner. The editing unit creates a data structure of associating between elements displayed on the display unit. If an element to be deleted is provided with a data structure of associating elements with each other, the editing unit also deletes another element associated via the data structure.
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