Abstract: The present invention relates to a method for displaying an advertisement in a mobile communication terminal using a button bar (icon) or an indication bar (icon), and an apparatus thereof, the method comprising the steps of: sensing whether a user operates a call allowance button bar; and inserting and displaying advertisement contents on a predetermined first set screen (or area) within the call allowance button bar when sensing the user operation for the call allowance button bar according to the sensed result. In addition, the present invention can effectively provide the advertisement for the user by using the call allowance/rejection button bar (icon) or the indication bar (icon) such as a character and the like.