The arbitration apparatus is generally a function program/module or a software algorithm running on a processor, and may alternatively be used as an independent hardware apparatus. The arbitration apparatus manages and allocates service resources based on input radio frequency usage information and service information of the modem. When the apparatus in this embodiment is in a DSDS mode, the two MODEMs need to request service resources from the arbitration apparatus in a preemption manner, and then the arbitration apparatus manages and allocates a same set of shared service resources for the two MODEMs. Only one MODEM can obtain a right to use the service resources at a time, the other modem needs to wait. When the apparatus in this embodiment is in the DSDA mode, the two MODEMs can operate concurrently, and the arbitration apparatus allocates different service resources to the two MODEMs. The service resource in this embodiment is also referred to as a radio frequency resource, namely, the radio frequency device mentioned above. The radio frequency device includes but is not limited to at least one of a radio frequency chip circuit, a radio frequency front end, or an antenna. The arbitration apparatus manages operating modes of the two MODEMs by allocating and managing the right to use the radio frequency device for the two MODEMs, so that the DSDS mode and the DSDA mode can be switched from each other for the two MODEMs.