| 摘要 |
This object aims to provide a technology for solving a problem so that the following link relations can be made clear even when a part of a region of a hierarchy structure is limited to display and nodes are arranged in the form in which unknown upper and lower relations of the hierarchy are entered in the displayed region. A tree display unit (203) reads out a tree structure of data from a hierarchy structure information recording unit (201) and displays a part of the tree structure in a tree display region of an output unit (202). A display parent determination unit (206) determines a parent node for a child node with an unknown parent and child relation from the display and displays a text of the parent node in a tree bar adjacent to the tree display region. Further, it is also possible to shift contents of the display contents shift to the tree display region and display the same, so as to render the parent and child relation recognizable.
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