A health condition determination system includes a measurement device that measures a vital value of a subject person, a first hardware processor that generates model information indicating daily circadian rhythm of the subject person from the vital value measured by the measurement device for one day or more, and a second hardware processor that compares a vital value measured by the measurement device after generation of the model information with the model information to determine the presence of a disturbance occurrence in the circadian rhythm of the subject person based on the comparison result.
