A portable electronic device is provided. The portable electronic device includes a memory configured to store instructions, and a screen configured to display data. The portable electronic device also includes a keyboard including a plurality of physical keys configured to receive key inputs. Each of the physical keys is associated with inputting a primary character and a secondary character. The portable electronic device further includes a processor configured to execute the instructions to detect an input of a physical key, determine whether the input is a press input or a tap input, the press input being associated with inputting the primary character, and the tap input being associated with inputting the secondary character. The processor is further configured to execute the instructions to enable display on the screen of the secondary character associated with the physical key based on the determination that the input is a tap input.