Introduction or a new appliance is definitely detected under a use circumstance of a flow rate measuring apparatus.;In a gas meter 104, an ultrasonic flow meter 104 measures a flow rate of gas flowing in a flow path 102. At the time of introducing the new appliance, a new event detecting unit 108 detects the introduction of the new appliance from unsteady behavior of a flow rate caused by a test operation of the gas appliance. A transmission/reception unit 110 transmits a new event signal representing the introduction of the new gas appliance detected by the new event detecting unit 108 to a center apparatus 20 through a network 30. As the unsteady behavior, there is an air purge of the gas appliance, or the like.
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