A terminal device has: a sensor unit which perform a measurement; a position detection unit which acquires information for specifying a position; a timing unit which acquires time information; a communication unit which communicates via a communication network; and a control unit. The control unit generates position information for indicating a position of the terminal device by the position detection unit. Besides, the control unit changes accuracy of the position information within a predetermined range, and generates information for transmission related with the changed position information, the time information gotten by the timing unit, and measurement information indicating a measurement result of the sensor unit. In addition, the control unit controls the communication unit so as to transmit the information for the transmission to an information processing device via a communication network.