ROAMING SERVICE METHOD IN MOBILE BROADCASTING SYSTEM, AND SYSTEM THEREOF

PROBLEM TO BE SOLVED: To provide a roaming service method and its system.SOLUTION: In this invention, the roaming service method includes: a stage in which a terminal receives a service guide from a corresponding visited service provider when the terminal moves to a roaming area; a stage in which the terminal transmits a roaming request message for requesting a purchase item allowable for individual services to a home service provider based on the received service guide; a stage in which, upon receipt of the roaming request message, the home service provider negotiates roaming availability and allowable range for each service with the visited service provider where the terminal is located, based on the roaming request message; and a stage in which the home service provider transmits the roaming availability and allowable range for each service, negotiated with the visited service provider, to the terminal.