Disclosed is a method and device for processing a call-related event in a mobile terminal. The device comprises a memory for storing character User Interface (UI) images corresponding to respective call-related events, an event collection part for collecting call-related events occurring in the mobile terminal and generating an event message for identifying each call-related event. The device also comprises an agent control part having a plurality of specialists for processing the call-related events, determining a specialist corresponding to an event message for a call-related event, selecting a character UI identification (ID) possessed by the determined specialist for the call-related event, outputting the selected character UI ID, and processing the call-related event according to feedback information received from a user. The device further comprises an agent expression part for outputting a character image and text corresponding to the character UI ID for the call-related event.