A method for providing a Graphic User Interface (GUI) associated with execution of an application in a mobile terminal supporting a multi-tasking function, and an apparatus implementing the same. The method for providing (GUI) in a mobile terminal, preferably includes: displaying an application execution icon region and application execution screen region configured by one or more application execution icons; receiving selection of one from the one or more application execution icons; and displaying a reduction mode execution screen of an application corresponding to the selected application execution icon on the application execution screen region. When using a multi-tasking function of a mobile terminal, the user can view a plurality of application execution screens on one screen, and input an operating command for a plurality of applications on one screen.