It should be noted that, that the MODEM 1 performs a first communication service on the millimeter-wave frequency band may be understood as that the MODEM 1 camps on the millimeter-wave frequency band, and may be in two statuses: waiting to process the voice service (waiting to send or receive a voice signal) and transmitting the voice service (sending or receiving a voice signal). Execution of the communication service in operation 501 is performing transmission and reception, namely, voice sending and receiving. Optionally, when the arbitration apparatus receives the voice service resource request, if the arbitration apparatus determines that there is no communication service being performed, the arbitration apparatus may also return a first acknowledgment response to the MODEM 1. The preset correspondence table is used to indicate a frequency band conflict status between the MODEM 1 and a MODEM 2. The frequency band conflict status includes: at least one of conflict frequency band information or non-conflict frequency band information of the MODEM 1 and the MODEM 2.