PURPOSE:To extract context structure from the sentences of wide range. CONSTITUTION:A morpheme analysis part 11 analyzes a morpheme for the inputted sentence. A connection relation for a previous sentence is recognized in a connection relation extraction part 13 or a connection relation estimation part 15 based on an analyzed result in the morpheme analysis part 11. A sentence merging part 16 puts together the sentences that do not have the development of a point and that continue and merges them with a part having the flow of the point into one sentence. A structure analysis part 17 analyzes structure based on the connection relation of the sentence having the flow of the point from the merged result.
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