| 摘要 |
An undo technique with improved ease-of-use is provided. A document processing apparatus executes editing, printing, and storage for a document file. An undo manager records the operation history of the document processing apparatus in an undo stack. Upon reception of a request from a user to record the operation state, the undo manager records the operation state in the undo stack in a manner that allows the operation state to be distinguished from other operation states. When the undo manager indicates the operation history for the user, the undo manager indicates the operation state that the user has requested to be recorded in a manner that allows this operation state to be distinguished from other operation states.
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