A method for supporting communication among avatars representing users in a virtual world shared by a plurality of users' client terminals and a server connected with each other through a network. The method includes the steps of: accumulating statistical information, which includes (i) a combination of a component of a message transmitted by one or more avatars and avatar motion matching the component, and (ii) a degree of usage of the combination; generating a keyword group from the components of a message transmitted by the one or more avatars in response to the transmission of the message; searching through the statistical information; obtaining one or more avatar motion candidates; and presenting the candidates to the user of the avatar. A system for supporting communication among avatars and a communication support server device in a virtual world are also provided.