10. A knowledge structure as claimed in claim 9 , wherein at least one of the elements is a word.
10. A knowledge structure as claimed in claim 9 , wherein at least one of the elements is a word. 12. A knowledge structure as claimed in claim 10 , wherein at least one of the element file includes a first link information file including at least a word tree, wherein at least one of the element file includes a second link information file including at least one word of the same meaning with the element.