A moving-object-mounted terminal (20, 90) for use in a measurement system configured to measure time required for a moving object within a wireless area formed by a wireless relay device to move a predetermined distance, and mounted on the moving object, comprising: a Global Positioning System unit configured to acquire positional data of the moving object and time data indicating the time when the positional data has been acquired by GPS; and a wireless unit (22, 91) configured to convert the positional data and the time data into a wireless signal and to transmit the wireless signal to the wireless relay device, wherein the wireless unit (22, 91) comprises: an interface (222, 912) configured to receive the positional data and the time data from the GPS unit; a communication processor (223, 914) configured to convert the received positional data and time data into a modulated signal in accordance with a predetermined communication format; and a communication module (224, 915) configured to transmit the modulated signal to the wireless relay device as the wireless signal, characterized in that the GPS unit comprises: a memory configured to pre-store a first acquisition frequency and a second acquisition frequency which is higher than the first acquisition frequency; a GPS measurement module configured to select one of the first and second acquisition frequencies and to acquire the positional data and the time data at the selected acquisition frequency, wherein the wireless unit further comprises: a frequency controller configured to instruct the GPS unit to select the second acquisition frequency when precise measurement of the moving velocity of the moving object is to start and to instruct the GPS unit to select the first acquisition frequency when precise measurement of the moving velocity of the moving object is to end. a Global Positioning System unit configured to acquire positional data of the moving object and time data indicating the time when the positional data has been acquired by GPS; and a wireless unit (22, 91) configured to convert the positional data and the time data into a wireless signal and to transmit the wireless signal to the wireless relay device, wherein the wireless unit (22, 91) comprises: an interface (222, 912) configured to receive the positional data and the time data from the GPS unit; a communication processor (223, 914) configured to convert the received positional data and time data into a modulated signal in accordance with a predetermined communication format; and a communication module (224, 915) configured to transmit the modulated signal to the wireless relay device as the wireless signal, characterized in that the GPS unit comprises: a memory configured to pre-store a first acquisition frequency and a second acquisition frequency which is higher than the first acquisition frequency; a GPS measurement module configured to select one of the first and second acquisition frequencies and to acquire the positional data and the time data at the selected acquisition frequency, an interface (222, 912) configured to receive the positional data and the time data from the GPS unit; a communication processor (223, 914) configured to convert the received positional data and time data into a modulated signal in accordance with a predetermined communication format; and a communication module (224, 915) configured to transmit the modulated signal to the wireless relay device as the wireless signal, characterized in that the GPS unit comprises: a memory configured to pre-store a first acquisition frequency and a second acquisition frequency which is higher than the first acquisition frequency; a GPS measurement module configured to select one of the first and second acquisition frequencies and to acquire the positional data and the time data at the selected acquisition frequency, a memory configured to pre-store a first acquisition frequency and a second acquisition frequency which is higher than the first acquisition frequency; a GPS measurement module configured to select one of the first and second acquisition frequencies and to acquire the positional data and the time data at the selected acquisition frequency, wherein the wireless unit further comprises: a frequency controller configured to instruct the GPS unit to select the second acquisition frequency when precise measurement of the moving velocity of the moving object is to start and to instruct the GPS unit to select the first acquisition frequency when precise measurement of the moving velocity of the moving object is to end. a frequency controller configured to instruct the GPS unit to select the second acquisition frequency when precise measurement of the moving velocity of the moving object is to start and to instruct the GPS unit to select the first acquisition frequency when precise measurement of the moving velocity of the moving object is to end.