We have developed a table game named Innovation Game that supports users for thinking up ideas with social creativity. There are two types of players in the Innovation Game, innovators and consumers. While the innovators think up ideas and propose them, the consumers criticize the ideas and make decisions whether they buy the ideas or not. In the Innovation Game, the innovators do not only propose ideas to the consumers, but also improve the ideas using comments of consumer that represent negative impression. Therefore, it is considered that ideas with social creativity are related to the negative comments from the consumers. However, the relation has not been cleared. In this paper, we analyze texts of discourse for communication generating social creativity. The analysis method focuses on the negative comments. We analyzed the Innovation Games using the method, and it was verified that the more negative comments the innovators accept, the more ideas with social creativity are obtained.