CAUSAL RELATIONSHIP EVALUATION DEVICE, CAUSAL RELATIONSHIP EVALUATION SYSTEM AND CAUSAL RELATIONSHIP EVALUATION METHOD

摘要

A causal direction evaluation unit (8) calculates, for each direction of causal relationship, a validity index that is a stochastic index indicating the validity of a causal relationship between words in an evaluation candidate. A validity determination unit (9) determines, on the basis of the validity index for each evaluation candidate, the evaluation candidate, causal direction, and validity index that are valid as information indicating the causal relationship.