A data processing device includes an acquisition unit configured to acquire first biometric data related to a first subject, a retrieval unit configured to retrieve second biometric data that is related to a second subject and has a degree of similarity to temporal change of the first biometric data that satisfies a first condition, and a prediction unit configured to predict onset of a particular disease in the first subject based on information indicating onset of the particular disease in the second subject associated with the second biometric data.
