Sensor registration method, sensor registration system, and relay device

A sensor registration system, comprising:

• an information processing device configured to process data obtained from a sensor;
• a first communication device comprising at least one connection port to which the sensor is connected;
• a communication terminal configured to:
• receive input of port information of the first communication device and sensor information of the sensor, the port information identifying the at least one connection port to which the sensor is connected, the sensor information including a type of the sensor;
• and
• generates association information by associating the received port information with the received sensor information;
• and
• a second communication device configured to:
• convert association information to have a predetermined format, the association information associating port information identifying the connection port with sensor information including a type of the sensor;
• and
• transmit the converted association information to the information processing device to register the sensor in the information processing device.