1. A method of allocating radio frequency (RF) resources by a multi-subscriber identification module (SIM) device including at least a first SIM and a second SIM, the method comprising:determining a frequency of performing RF resource allocation to the second SIM based on a data communication state of the first SIM and a received signal state of the second SIM; and
allocating the RF resources to the second SIM based on the frequency of performing the RF resource allocation,
wherein the first SIM is in a connected mode, and
wherein the second SIM is in an idle state.