| 摘要 |
<p>A selection device (200) whereby an item is selected from a tree structure in which items are associated with a plurality of nodes. A storage unit (201) stores said tree structure, the item associated with each node in the tree structure, and one of the nodes (the "focused node") in the tree structure. On the basis of instructions from a user, a movement unit (202) updates the storage unit (201) so as to move the focus, starting from the root node of the tree structure, until one of the leaf nodes of the tree structure is reached. An output unit (203) outputs that item as the selection result. If the frequency with which a given leaf node is reached satisfies a prescribed criterion, the update unit (204) updates the storage unit (201) so as to make a new leaf node a child of the root node of the tree structure, said new leaf node being associated with the following: the item associated with the aforementioned given leaf node; and the items associated with all of the nodes traversed on the way to said leaf node.</p> |
