For reducing human errors in navigating ships, crews on a bridge must cooperate. To understand how the cooperation is conducted is necessary for improving trainings and manuals. We apply three types of discourse analysis, quantitative analysis, qualitative analysis and sequence analysis. We developed information systems, named CORAS (COoperation Record and Analyze System.), to support these analyses. CORAS manages several types of time-series data, which includes video, audio, environment data and trainers' evaluations. By using CORAS, we analyze two simulator trainings and reveal a dynamic mechanism of team cooperation.