A sensor evaluation system communicating to a plurality of sensors and an analysis system providing analysis service using time series sensor data obtained from at least one of the plurality of sensors includes a time series data recorder recording a time series data showing changes with time of events having predetermined relations with the analysis service associating with the analysis system, a sensor relevance ratio calculator calculating sensor relevance ratios indicating relevance ratios of sensor data to the time series data by comparing changes with time of events indicated by the time series data and time series records of the sensor data used by the service execution part to provide analysis service in the same period, and a sensor importance calculator calculating sensor importance using the sensor relevance ratio calculated by the sensor relevance ratio calculator as a guide before recording the calculated sensor importance in a sensor importance recorder.