An evaluation apparatus configured to evaluate quality of a conversation made across a first acoustic area and a second acoustic area in a vehicle in which a plurality of acoustic areas are predetermined, wherein a first speaker and a first microphone are disposed in the first acoustic area, and a second speaker and a second microphone are disposed in the second acoustic area, the second speaker is configured to emit a voice signal collected by the first microphone, wherein the evaluation apparatus comprises: an evaluation value acquisition unit configured to acquire an evaluation value using, as an evaluation target sound, a voice signal obtained by adding a voice signal obtained from a first voice signal emitted from a sound source in the first acoustic area, collected by the first microphone, and emitted from the second speaker to a voice signal obtained from the first voice signal transmitted through a space inside the vehicle and reaching the second acoustic area, the first voice signal being used as a reference sound, the evaluation value being an objective evaluation value relating to the quality of the conversation, the objective evaluation value being calculated from the evaluation target sound and the reference sound; and a conversion unit configured to convert the objective evaluation value to a subjective evaluation value, the conversion unit linearly converting the objective evaluation value to obtain the subjective evaluation value based on a linear relationship obtained from a subjective evaluation value acquired in a conversational test performed across two acoustic areas of the plurality of acoustic areas and an objective evaluation value acquired using an evaluation target sound and a reference sound obtained by recording a voice of the conversational test. wherein a first speaker and a first microphone are disposed in the first acoustic area, and a second speaker and a second microphone are disposed in the second acoustic area, the second speaker is configured to emit a voice signal collected by the first microphone, wherein the evaluation apparatus comprises: an evaluation value acquisition unit configured to acquire an evaluation value using, as an evaluation target sound, a voice signal obtained by adding a voice signal obtained from a first voice signal emitted from a sound source in the first acoustic area, collected by the first microphone, and emitted from the second speaker to a voice signal obtained from the first voice signal transmitted through a space inside the vehicle and reaching the second acoustic area, the first voice signal being used as a reference sound, the evaluation value being an objective evaluation value relating to the quality of the conversation, the objective evaluation value being calculated from the evaluation target sound and the reference sound; and a conversion unit configured to convert the objective evaluation value to a subjective evaluation value, the conversion unit linearly converting the objective evaluation value to obtain the subjective evaluation value based on a linear relationship obtained from a subjective evaluation value acquired in a conversational test performed across two acoustic areas of the plurality of acoustic areas and an objective evaluation value acquired using an evaluation target sound and a reference sound obtained by recording a voice of the conversational test. an evaluation value acquisition unit configured to acquire an evaluation value using, as an evaluation target sound, a voice signal obtained by adding a voice signal obtained from a first voice signal emitted from a sound source in the first acoustic area, collected by the first microphone, and emitted from the second speaker to a voice signal obtained from the first voice signal transmitted through a space inside the vehicle and reaching the second acoustic area, the first voice signal being used as a reference sound, the evaluation value being an objective evaluation value relating to the quality of the conversation, the objective evaluation value being calculated from the evaluation target sound and the reference sound; and a conversion unit configured to convert the objective evaluation value to a subjective evaluation value, the conversion unit linearly converting the objective evaluation value to obtain the subjective evaluation value based on a linear relationship obtained from a subjective evaluation value acquired in a conversational test performed across two acoustic areas of the plurality of acoustic areas and an objective evaluation value acquired using an evaluation target sound and a reference sound obtained by recording a voice of the conversational test.