| 摘要 |
PROBLEM TO BE SOLVED: To reproduce a presentation performed by a user by describing a line or the like on a screen on which images are displayed one after the other.SOLUTION: A screen image storage section (48) stores, when an image depicted on a document display layer is changed, the image after the change in association with the change timing in an image storage section. A locus image depiction section (50) depicts a locus image indicating a locus in a position on a display screen input by a user in a locus display layer. The locus image is updated every time a position on the display screen is input according to the position coordinate of the position. The image in the document display layer and the image in the locus display layer are superimposed and displayed on the display screen. A position storage section (52) stores, every time a position is input on the display screen, the position information of the position in association with the input timing in a position storage section. |
