The main purpose of the study is to find out the differences of 'opinion expression online' through two countries, Korea and China. This paper is to focus especially on their behavior which is use of Twitter. This study predicts three factors, 'demographic factor', 'Twitter use time' and 'Internet use pattern' as the Influence factors to affect their opinion expression online. A review of existing relative researches have showed that first, to test the researches based on offline; secondly, based on the ratio scale; thirdly, only few studies have conducted a comparative study between countries.
The results of this study shows that Chinese people who use Twitter more tend to express their opinions online compare with Korean people. This study found that Chinese men group is showed the most strongest willingness to express their own opinions. It also confirms that Twitter use time have a positive influence on the behavior of opinion expression online. There is also correlation between the Internet use pattern and the opinion expression online. The people who are habitually use Internet more tend to express their opinions online. It is especially for Chinese people compare to Korean people.
As the results of this study, once again we found out that Chinese people are not hostile to express their own opinions online compare with Korean people. We need to collect and analyze the written language material online made by chinese people who have been adapted to express their opinions online. The study also covers that people who use Twitter long and use it habitually are more express their opinions online. That is to say that the length of Internet use time and the purpose of Internet use have an effect on the behavior of opinion expression online. It will be the research with a follow-up study over this.