Remote communication via avatars in the metaverse has attracted much attention. However, in a PC environment that doesn’t have the motion tracking of a VR headset, it is difficult to determine whether the user's avatar has been continuously participating in a conversation. In this paper, we propose a communication system that represents whether avatars have been continuously participating in a conversation by reflecting users’ nods in avatars and changing the transparency of avatars according to how often they nod in a PC-based metaverse environment. In this study, a prototype was actually developed and evaluated through an evaluation experiment. As a result, it was shown that by changing the avatar's transparency according to how often it nods, it becomes clearer compared to using only the nodding function whether the avatar is listening or not, and whether it has been continuously participating in the conversation or not. The feedback method, reflected in the avatar's transparency change, is expected to be one future way to support communication in the metaverse using avatars.