One mode of the present invention is configured to acquire sensor-side metadata including a first label corresponding to a label showing a name given in order to identify event data, to acquire app-side metadata including a second label that is an event condition showing a condition of an event and corresponds to the label, to determine, in a case where sensing data satisfies a requirement of an application, whether the first label and the second label are identical, and to transmit, in the case where these labels are identical, a dataflow control command including information specifying a sensor, information specifying the application and the event condition included in the app-side metadata.