Patent ID: 8013746

Claim:
A method of providing alarm service regarding movement of a mobile terminal, the method comprising: acquiring past location registration information for the mobile terminal designated by a subscriber, the past location registration information being base station identifiers associated with base stations to which the mobile terminal have previously been registered; generating a base station database by selectively including the base stations to which the mobile terminal have previously been registered according to an observation region designated by the subscriber; acquiring current location information, the current location information being a base station identifier associated with a current base station to which the mobile terminal is currently registered; determining whether the current location information is stored in the base station database; incrementing, by a service-providing server, a checking frequency for the current base station according to the current location information when the current location information has been stored in the base station database and storing the checking frequency in the base station database; monitoring the checking frequency; removing a base station from the base station database when its corresponding checking frequency calculated during a latest period is smaller than a predetermined value; and notifying the subscriber if the current location information is not stored in the base station database.