Patent ID: 7899790

Claim:
An apparatus to back up heterogeneous terminal user information in an Internet Protocol (IP) terminal, the apparatus comprising: a terminal connection interface to connect to a heterogeneous terminal; a temporary synchronization storage unit to temporarily store phone number information of the heterogeneous terminal; a synchronization controller to set synchronization with the heterogeneous terminal and to concurrently store the phone number information of the connected heterogeneous terminal in the temporary synchronization storage unit, in response to the heterogeneous terminal connecting to the terminal connection interface; and a data converter to perform data conversion between the phone number information of the heterogeneous terminal stored in the temporary synchronization storage unit and phone number information of the IP terminal, the phone number information of the IP terminal being stored in a data storage unit, wherein, in the absence of phone number information for conversion, the data converter converts data into a null value, and wherein the data converter applies the null value to a smaller sized number corresponding to the phone number information of the heterogeneous terminal for conversion.