Each transmitter transmits temperature/pressure data of an associated tire together
with an ID assigned to each transmitter. A pneumatic tire pressure monitoring apparatus
receives the temperature/pressure data, and inputs traveling condition specifying
data which specifies traveling conditions of the vehicle. Then, the pneumatic tire
pressure monitoring apparatus identifies IDs assigned to the transmitters of respective
tires actually installed on vehicle wheels of its own vehicle based on the temperature/pressure
data and the traveling condition specifying data, and registers the identified
IDs into a memory of the pneumatic tire pressure monitoring apparatus.