A complementary method to determine semantic orientations of words based on WordNet

Semantic orientations of words is an important part in the sentiment analysis. Several methods for polarity detection of words were briefly introduced in this paper. We focused on WordNet-based methods and analyzed a classic one. In order to overcome shortage of this method, we proposed a complementary method with the help of “second level synonym”. The evaluation in the end of this paper showed that our complementary method was effective.