1. An analysis object determination device comprising: a detection unit which detects a plurality of specific utterance sections on the basis of data related to a voice in a conversation, the specific utterance sections representing a plurality of specific events originating from one or a plurality of participants in the conversation, or a specific event originating from one of the conversation participants; and an object determination unit which determines, on the basis of the plurality of specific utterance sections detected by the detection unit, one or more cause analysis sections for the specific event originating from the conversation participant, the number of the cause analysis sections being fewer than the number of the plurality of specific utterance sections.