3. The intention estimating device according to claim 2 , wherein said intention hierarchical layer graph data have a relationship in which an intention in a lower hierarchical layer gives a concrete form to an intention in a higher hierarchical layer, and said intention co-occurrence weight calculator refers to said intention hierarchical layer graph data to, when a common intention in a higher hierarchical layer exists in two contiguous partial intentions which construct said intention sequence generated by said intention sequence estimator, calculate said intention co-occurrence weight by using a weight defined for said intention in a higher hierarchical layer.
2. The intention estimating device according to claim 1 , wherein said intention co-occurrence weight calculator refers to intention hierarchical layer graph data in which said intentions are hierarchized and defined according to the relationship between said intentions to calculate said intention co-occurrence weight by using a weight which is defined for each of said intentions which constructs each hierarchical layer.