8. The voice data analyzing device according to claim 1 , further comprising a speaker recognition unit which recognizes which speaker is the speaker of each utterance included in a specified piece of voice data by calculating consistency with the speaker models and consistency of the co-occurrence relationship in the whole voice data in regard to each utterance included in the specified voice data by use of the speaker models derived by the speaker model deriving unit and the speaker co-occurrence model derived by the speaker co-occurrence model deriving unit.
8. The voice data analyzing device according to claim 1 , further comprising a speaker recognition unit which recognizes which speaker is the speaker of each utterance included in a specified piece of voice data by calculating consistency with the speaker models and consistency of the co-occurrence relationship in the whole voice data in regard to each utterance included in the specified voice data by use of the speaker models derived by the speaker model deriving unit and the speaker co-occurrence model derived by the speaker co-occurrence model deriving unit. 9. The voice data analyzing device according to claim 8 , wherein the speaker recognition unit calculates the probability that an utterance corresponds to each speaker and selects a speaker maximizing the probability as the result of the speaker recognition in regard to each utterance.