A communication device includes a communication interfacing unit, a display unit, and a processor. The processor operable to perform operations includes controlling the display unit to display a user interface; controlling the display unit to display a first icon on the user interface, in which the first icon indicates a first strength of a first signal of a radio access technology (RAT) received by the communication interfacing unit; and controlling the display unit to display a second icon on the user interface corresponding to a second strength of a second signal of the RAT received by the communication interfacing unit, in which the first signal and the second signal are transmitted by different devices.