A meter system comprising: a meter (100; 400) including a flow path through which a fluid to be measured flows, an abnormality detector that detects an abnormality, a flow rate measurer that measures a flow rate of the fluid to be measured that flows through the flow path, a calculator that integrates the flow rate measured by the flow rate measurer, a communicator that transmits an integrated value integrated by the calculator as data in a predetermined cycle, and a vibration detector that detects a vibration; and a host equipment (200, 300) that receives the data from the meter (100; 400), wherein, when a magnitude of the vibration detected by the vibration detector is equal to or greater than a predetermined value, the abnormality detector determines that there is an abnormality, characterised in that, when the abnormality detector detects the abnormality, the meter (100; 400) transmits data indicating that the abnormality is detected, to the host equipment (200, 300) by the communicator in the predetermined cycle, when the host equipment (200, 300) receives the data indicating that the abnormality is detected, the host equipment (200, 300) transmits, to the meter (100; 400), data for setting the predetermined cycle to be shorter, and the meter (100; 400) shortens the predetermined cycle based on the data received from the host equipment (200, 300), or when the abnormality detector detects the abnormality, the meter (100; 400) transmits the data indicating that the abnormality is detected, to the host equipment (200, 300) by the communicator in an optional timing, and then the meter (100; 400) shortens the predetermined cycle. a meter (100; 400) including a flow path through which a fluid to be measured flows, an abnormality detector that detects an abnormality, a flow rate measurer that measures a flow rate of the fluid to be measured that flows through the flow path, a calculator that integrates the flow rate measured by the flow rate measurer, a communicator that transmits an integrated value integrated by the calculator as data in a predetermined cycle, and a vibration detector that detects a vibration; and a host equipment (200, 300) that receives the data from the meter (100; 400), wherein, when a magnitude of the vibration detected by the vibration detector is equal to or greater than a predetermined value, the abnormality detector determines that there is an abnormality, characterised in that, when the abnormality detector detects the abnormality, the meter (100; 400) transmits data indicating that the abnormality is detected, to the host equipment (200, 300) by the communicator in the predetermined cycle, when the host equipment (200, 300) receives the data indicating that the abnormality is detected, the host equipment (200, 300) transmits, to the meter (100; 400), data for setting the predetermined cycle to be shorter, and the meter (100; 400) shortens the predetermined cycle based on the data received from the host equipment (200, 300), or when the abnormality detector detects the abnormality, the meter (100; 400) transmits the data indicating that the abnormality is detected, to the host equipment (200, 300) by the communicator in an optional timing, and then the meter (100; 400) shortens the predetermined cycle.