1. An entailment evaluation device comprising: a generation unit configured to generate first information indicating at least an order of occurrence of events of first and second simple sentences included in a hypothesis text and generates second information indicating at least an order of occurrence of events of third and fourth simple sentences included in a target text, the third simple sentence being related to the first simple sentence, the fourth simple sentence being related to the second simple sentence; a calculation unit configured to obtain a calculation result by comparing, based on the first and second information, the order of occurrence of events of first and second simple sentences and the order of occurrence of events of third and fourth simple sentences; and a determination unit configured to determine, based on at least the calculation result, whether or not the target text entails the hypothesis text.
3. The entailment evaluation device according to claim 1 , further comprising a division unit configured to obtain, by dividing the hypothesis text, a plurality of simple sentences, including the first and second simple sentences, each having one predicate and obtain, by dividing the target text, a plurality of simple sentences, including the third and fourth simple sentences, each having one predicate.