A data collection apparatus in a traffic transfer system collects and transfers low-bit-rate traffic data from an IoT device, and transfers high-bit-rate traffic data in an identified area. A traffic transfer apparatus performs determination as to whether or not a service-supported event occurs, by inputting the low-bit-rate traffic data into a learner and, when occurrence is determined, acquires and transfers the high-bit-rate traffic data in the identified area. The traffic transfer apparatus causes the learner to relearn a result of analysis of the transferred high-bit-rate traffic data and the low-bit-rate traffic data used in the determination.