A trained model establishment method to be implemented by a computer according to one aspect of the present invention comprises processes of acquiring a plurality of data sets each composed of a combination of first performance data of a first performance by a performer, second performance data of a second performance given with the first performance, and a satisfaction level label indicating the satisfaction level of the performer, and performing machine learning on a satisfaction level estimation model using the plurality of data sets. In the machine learning, the satisfaction level estimation model is trained such that regarding each data set, a result obtained by estimating the satisfaction level of the performer from the first performance data and the second performance data matches the satisfaction level label.
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