| 摘要 |
<p>In an information processor which manages operational history data or status data to revert an application back to any desired point in the past or make use of the past operations, an interface screen 1 has thereon cards 2 as an object which is manipulated by the user to make use of the history, and the contents of the history are represented, while the order of said cards 2 being put one upon another is associated with the time series of the history. A card representation is provided on the screen presented by the application to the user at any point in the past, or the screen to provide a card representation is defined by images which display alternately screen representations before and after a change in the application screen by the operation performed by the user at any point in the past, while the before- and after-change representations are displayed for different periods of time. A tag 5 to be provided to the card is incorporated in the interface screen, and objects of stacks 3 and 4, which are a location where a bundle of cards arranged according to the time series of the card history is placed and to which instructions as to an user's operation performed on said card bundle are inputted, are incorporated on the user's interface screen. The stack 3 cooperates with the application, letting the application execute an operational history corresponding to a card sequence on said stack and the results be represented on said cards, and the card sequence is inserted into the stack cooperative with the application, thereby letting the application execute the operational history. <IMAGE></p> |
