Apparatus and method for updating of data in portable terminal

PURPOSE: A data update apparatus in a portable terminal and method thereof are provided to promote the convenience of a user by effectively managing an address book in the portable terminal. CONSTITUTION: A data update unit(104) manages information for terminals which transmits an automatic address book update request. A control unit(102) requests the changed address book information of the terminals which transmit the automatic address book update request by using the data update unit. The control unit receives the changed address book information from an update server(120) which manages the address book of the terminals.