Text information monitoring dictionary creation device, text information monitoring dictionary creation method, and text information monitoring dictionary creation program

摘要

An object of the present invention is to create a text information monitoring dictionary that enables highly accurate detection compared to the prior art. The feature degree calculation unit 3 compares the statistics of the positive example set and the negative example set, and calculates the degree of occurrence of the focused phrase in the positive example set as the feature degree. The usefulness calculation unit 21 calculates the usefulness of each phrase extracted by the phrase extraction unit 1 using an index related to the length of the phrase, the frequency in the positive phrase set, and the inclusion relation between phrases. . For each phrase, the detection condition determination unit 22 uses the usefulness calculated by the usefulness calculation unit 21 and the feature degree calculated by the feature degree calculation unit 3 to detect the detection condition based on the product of the usefulness and the feature degree. As a detection condition, it is determined that the detection condition is appropriate.