Abstract
In these days, people can easily disseminate the information including their personal evaluative opinions for some products and services on the Internet.The massive amount of their information is beneficial for both product companies and users who are planning to purchase and use them.Because their information is mainly presented as textual form, in the research field of natural language processing, many researchers have devoted themselves to developing techniques for exploring, extracting, mining, and aggregating the opinions and sentiments.This sort of techniques are commonly called sentiment analysis.In this paper, we survey and present the research efforts of sentiment analysis from its fundamentals to the state-of-the-art methods.
