1. A disease analysis apparatus comprising: an image acquisition unit acquiring an analysis image that is an image in which a plurality of cell nuclei in a lesion of a target person are captured; a feature-value calculation unit calculating a feature-value relating to the cell nuclei using the analysis image; an evaluation function acquisition unit acquiring an evaluation function from an evaluation function storage unit storing the evaluation function with which prediction information is calculated based on the feature-value, the prediction information indicating a prediction relating to a prognosis of a disease or a prediction relating to malignancy of a disease; and a prediction information generation unit generating the prediction information relating to the target person, based on the feature-value calculated from the analysis image, and based on the evaluation function.