| 摘要 |
A thumbnail creating section creates a thumbnail of a specified object to be read. A linear information computing section computes an internal coordinate used as linear information from attribute information on each content. An order-of-priority determining section determines the order of priority of each content. A thumbnail line-forming section forms a line of thumbnails according to the scale specified by the user. A superposition thumbnail nondisplay section does not display a thumbnail having the lower order of priority than that of the other of the superposed thumbnails.
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