By using multiple channels at the same time to realize broadbanding of the frequency channels and suppressing increase in the waiting time before starting transmission of wireless signals, improvement of the practical throughput can be realized. A wireless communication apparatus API is a wireless communication apparatus provided with a space division processing unit 40 for identifying which space area a radio wave has come from; a frequency division processing unit 30 for identifying which channel the radio wave has been carried through; a carrier sense unit 50 for judging the busy/idle state of the identified channel in the identified space area; a storage unit 60 for storing the judged busy/idle state in association with the space area and the channel; a determining unit 70 for, when a radio wave is transmitted to a first wireless communication apparatus, determining a channel to be used at the time of transmission according to the busy/idle state of each channel in the space area in which the first wireless terminal is located.