A backup method for user data in a mobile terminal is disclosed, in which user
data stored in a previous mobile terminal can be used in a new mobile terminal
when exchanging a mobile terminal with a new one. The backup method for user data
in a mobile terminal includes the steps of transmitting the user data of the first
mobile terminal to a base station to be stored in the base station, and (b) downloading
the user data stored in the base station to the second mobile terminal.