1. A character input method for adding a visual effect to a character when the character is input to a mobile station, the method comprising the steps of: selecting a visual character theme for adding a visual effect to the character and displaying a background image according to the selected visual character theme on a screen of the mobile station; receiving a request for displaying the character; adding the visual effect corresponding to the selected visual character theme to the character; and displaying the visual character to which the visual effect is added on the displayed background image.