The causal sentence analysis apparatus includes a causal sentence extraction unit that extracts a cause expression and a result expression including a result expression from a sentence, and an acquisition unit that acquires information indicating a reference expression that is a reference for analyzing the degree of similarity And the causal sentence extracted by the causal sentence extraction unit, the cause similarity included in the causal sentence and the reference expression, and the cause expression included in the causal sentence and the reference expression One of the similarity analysis unit for calculating the result similarity that is the similarity of the result, the cause expression included in the causal sentence, and the result expression is similar to the reference expression, and the other is dissimilar to the reference expression And a desired causal sentence extraction unit that extracts the causal sentence that is.
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