The proliferation of online video conferencing systems has given people the freedom to choose between online or face-to-face meetings. However, one of the challenges of online video conferences is that when participants (passive speakers) lack enthusiasm or initiative in discussions, it often becomes difficult to reach a consensus. To address this, we analyzed the nonverbal characteristics and processes that lead to consensus formation, focusing on the gaze information of passive speakers in three-party video conferences. Furthermore, based on the insights obtained from these survey results, we propose a method to externalize the thoughts of passive speakers in three-party video conferences equipped with gaze tracking functionality. The experimental results demonstrate that the proposed method could externalize the thoughts of passive speakers and facilitate consensus building.