In this embodiment of this application, a non-millimeter-wave frequency band radio frequency front end and a millimeter-wave frequency band radio frequency front end are independent of each other. The MODEM 1 supports a global system for mobile communications (GSM), a universal mobile telecommunications system (UMTS), long term evolution (LTE), and a NR access standard that used for a millimeter-wave frequency band. The MODEM 2 supports the GSM, the UMTS, and the LTE access standard, but does not support the millimeter-wave frequency band.

Optionally, types of access standards supported by each MODEM may be extended or lessened. The MODEM 1 supports the NR, and the MODEM 2 does not support the NR. In other words, in this embodiment, the NR access standard is supported only by one MODEM, and the other MODEM operates only in a non-millimeter-wave operating band. The NR access standard may support operating in a non-millimeter-wave operating band and a millimeter-wave frequency band.

The following may further describe the technical solutions of this application by using embodiments. An example in which a concurrent operating mode is the DSDA mode and a non-concurrent operating mode is the DSDS mode is used for description. The concurrent operating mode means that services of a plurality of MODEMs can be performed at the same time. The non-concurrent operating mode means that the services of the plurality of MODEMs are performed by preempting a service resource, that is, the services of the plurality of MODEMs cannot be performed at the same time.

1. A DSDA mode is switched to a DSDS mode for services on two SIMs.