A status expression system and method operating the same are provided for presenting a state of the mobile phone by means of a character agent. A status expression system of the present invention includes a memory for storing a plurality of character quotients, information on at least one state transition model, and resources for presenting the character; a character controller for updating the character quotients according to events occurred in the mobile phone, determining a state by analyzing the character quotients and referring to the state transition model, and formatting the state using the resources assigned for the state of the character; and a display for presenting the character with the resources in the state.