CONSTITUTION: A wearable device 10 detects a patient's active mass and an environmental value showing patient's surrounding environment every one minute, and transfers minute data containing the detected active mass and environmental value to a cloud server 60. The cloud server 60 stores this transferred minute data in a database. Upon receiving a report creation request from a client PC70, the cloud server 60 defines multiple time zones on the basis of onset time of a patient-holding disease, and evaluates the minute data stored in the database every time zone. Also, the cloud server 60 infers the onset factor of the patient-holding disease based on evaluation results, and transfers the onset factor report describing the inferred onset factor to the client PC70.EFFECT: The inference accuracy of the onset factor can be increased concerning a patient-holding disease.SELECTED DRAWING: Figure 1
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