Abstract: A system includes oscillator carried by a worker to output an oscillator identifier by a radio wave; receivers each detecting the oscillator by the oscillator identifier and generating oscillator detection information by associating the oscillator identifier with a receiver identifier and timing information of receiving the radio wave, the receivers being arranged in places in a workplace for the worker; and an analysis device configured to manage an operation performance of the worker in the workplace on the basis of detection period information based on the oscillator detection information. The analysis device includes a noise removal processing unit configured to determine whether the worker has actually performed an operation in a workplace associated with the receiver on the basis of a length of the period, and remove, when determining that the worker has not actually performed the operation, the worker from an operation performance in the workplace.