| 摘要 |
PURPOSE:To return to an optional previous condition without using a large capacity storage device by providing a history storage part to store the history of an instruction input and a control part to re-execute an instruction up to the midway of the history. CONSTITUTION:The condition at the time of starting an editing work by an operator is stored into an initial condition duplicating storage part 5, at the time of an input instruction, this is received, and the input instruction is stored into a history storage part 4. The input instruction is executed and the result is informed to the operator with display, etc. After the processing completion, the condition before a certain instruction is executed is returned. An 'undo' processing request is monitored. When the 'undo' processing request is executed, the contents of the history storage part 4 are referred to, based on the contents of the initial condition duplicating storage part 5, a necessary processing is re-executed, and after the 'undo' processing is completed, the processing step to process a next input is returned.
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