An object of the present disclosure is to provide a communication path switching method for improving a throughput of TCP communication at the time of switching a communication path between a first communication path that is at least one of a low latency or high speed and a second communication path that is at least one of a high latency or low speed.
The communication path switching method according to the present disclosure is a communication path switching method for switching a communication path to a first communication path or a second communication path by using operation of a TCP accelerator in a communication path switching system including a terminal that performs TCP communication by switching a communication path between the first communication path that is at least one of a low latency or high speed and the second communication path that is at least one of a high latency or low speed, the communication path switching method including: receiving data from the terminal; and when the data is first received after the communication path is switched from the first communication path to the second communication path, transmitting again to the terminal, an acknowledgement signal transmitted last before the communication path is switched.