This paper describes impacts of speech content, verbal behavior and non-verbal behavior in the evaluation of utterances of speakers in group discussions of job hunting. After creating stimuli different modal: "brief text", "voice" and "video" of speaking trimmed from simulated group discussions, evaluation tests of impression were performed by the third party evaluators who did not participate in the discussions. The evaluation result suggests “video” stimulus with rich non-verbal behavior gets higher score in terms of “soundness of logic” rather than “video” and “brief text” with increase of observable information regardless of whether utterances are logically sound or not