| 摘要 |
PROBLEM TO BE SOLVED: To provide an undo function or redo function which can be executed by designer units at the time of executing design of a team type. SOLUTION: A database server 20 is provided with a part DB21 and a history DB23 commonly provided in the same team, and a history DB managing part 24 for collecting the history information of an operation executed by a designer, and recording it in the history DB23. The history information includes the date of the operation, the objective element of the operation, the classification of the operation, the designer of the operation, and the valid flag of the history information. When a designer executes an undo function in an operator reference mode, the history information of the operation executed by the designer is retrieved, and only the operation just previously executed by the designer is canceled, and any operation executed by the other designer in the same team is not canceled. Also, when a designer executes a redo function, the operation canceled when the designer just previously executes the undo function is restored, and the operation executed by the other designer in the same team is not restored.
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