A monitoring system at least includes a measuring device that measures a temperature distribution based on infrared light and a monitoring device that measures image information based on visible light, in which the monitoring device includes an acquisition unit that acquires attribute information of a monitored target extracted based on the image information and fever information of the monitored target from the temperature distribution in a time series and an analysis unit that analyzes the attribute information and a change of the fever information and predicts a transition of the fever information based on the analysis result.
