When the application processor 210 determines a handover to the second communication network, based on information about the state of charge of the battery, the first communication processor 220 may perform disconnection from the first communication network. The first communication processor 220 may perform disconnection from the first communication network, based on a handover request from the application processor 210, regardless of whether there is data transmitted and received through the first communication network. For example, the first communication processor 220 may transmit a disconnection request message to the first communication network, based on the handover request from the application processor 210. When a communication channel with the first communication network is released based on the disconnection request message, the first communication processor 220 may transmit information about completion of disconnection from the first communication network to the second communication processor 230.