In this study, we constructed and evaluated a place of group discussion in the lecture using Table Top Interface. First, we constructed some sets of system for supporting group discussions. Then, we researched which sets of system are useful for supporting group discussion when we tried to use these systems in our laboratory’s seminar. Finally, we evaluated a value of supporting group discussion in classes with evaluation forms and interviews for students and a lecturer. In addition, we analyzed conversations in some lectures quantitatively and qualitatively.