Optionally, in some embodiments of this application, the first operating mode is the non-concurrent operating mode, the second operating mode is the concurrent operating mode, and that the arbitration apparatus performs one of the following operations may include: when the determining result is that the third frequency band does not conflict with the second frequency band, the arbitration apparatus switches the first operating mode to the second operating mode for the MODEM 1 and the MODEM 2. For example, when the third frequency band does not conflict with the second frequency band, the arbitration apparatus may switch from the dual SIM dual standby mode to the dual SIM dual active mode. In this embodiment of this application, if the arbitration apparatus switches to the dual SIM dual active mode, it indicates that the first communication service on the MODEM 1 and the communication service on the MODEM 2 may be concurrently performed. This ensures normal execution of services on a plurality of SIMs on the terminal and therefore improves user experience.