PROBLEM TO BE SOLVED: To evaluate whether or not utterance in conversation has been performed at an appropriate timing.SOLUTION: A voice input device 2 of a communication skill evaluation system 1 inputs voice data of a participant in conversion, and a measurement device 3 measures a nonverbal behavior in conversation of the participant. An utterance section detection part 53 of the communication skill evaluation device 5 detects start time and end time of each utterance and the participant who has uttered on the basis of the voice data. A next speaker estimation part 54 estimates next speaker probability as probability that each participant utters the next after the end of each utterance in conversation on the basis of a measurement result by the measurement device 3. An evaluation part 55 calculates a value of a skill determination parameter quantitatively representing a communication skill of the participant on the basis of the next speaker probability of the participant when the participant utters or the participant does not utter in conversation.SELECTED DRAWING: Figure 1
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