In the integrated public affairs management framework, except information communication, mass communication media also have economic industrial characteristics. Issues from mass communication media must make people have clinical and neutral cognition to avoided influences on people¡¦s judgements about facts. According to the study of the third-person effect, we proved that people mentually exist cognitive biases against communication information. Thus they always become operated subjects of elections. In order to understand subjects¡¦ cognitive and judge models, we employed three major factors, two situations of negative and positive news about THSR (Taiwan High-Speed Railway) to design our Information Integration Theory research. We also compared with the south and north people in Taiwan to show unbalances of the regional development about mass media and population quality. Findings of the research are as follow¡G 1. The north people with different issue involvements, have more movements in the the third-person effect in the negative news situation. 2. In the negative news situation, the north people¡¦s third-person effect and information reliability were represented by a negative correlation. 3. Media expose and people¡¦s third-person effect were represented by a positive correlation. 4. People¡¦s information integration models were following the adding rule. 5. The north people have more intention to support media regulation with the public opinion and actions. At last, we concluded several suggestions: 1. Unbalances of the regional development in Taiwan not only between the south and north, we must invest more resources to study and record. 2. Our study was a tiny subsection of public affairs management framework, researchers could study deeper and wider in the future. 3. The statistic tool of Information Integration Theory need to be updated to simplify importing data.