This paper describes a method of exchanging tacit community knowledge using talking-virtualized-egos. We aim at sharing tacit knowledge in a community, for this purpose, we propose two ideas. The first idea is an exchange of narrative-mode messages with voices and gestures among community members; the members share tacit knowledge each other by telling narrativemode messages. Oral communication enables us to converse casually. The other idea is a talking-virtualizedegos metaphor; this metaphor mimics a theater where virtualized-egos talk and exchange narrative-mode message with voices and gestures on behalf of community members. Each community member can gain the tacit community knowledge from the other members’ point of view by observing the exchange objectively. To investigate these ideas, we have developed a system called EgoChat that supports tacit community knowledge sharing by exchanging narrative-mode messages orally based on the talking-virtualized-egos metaphor. Effectivi...