Abstract: A negligence term score storage stores, for each of a plurality of words, a negligence term score that is an index representing the likelihood of appearance in a report indicating that an event has occurred due to negligence of an organization. A severity term score storage stores, for each of a plurality of words, a seriousness term score that is an index representing the likelihood of appearance in a report indicating that a serious event has occurred. A score deriver extracts the plurality of words described in the report to be analyzed, and derives a risk score that is an index representing the magnitude of the risk of the organization on the basis of the negligence term score of each of the extracted words, the seriousness term score of each of the extracted words, and a weight in risk evaluation determined in advance.