There is provided a service method in a mobile terminal supporting a telephone call service and a plurality of additional services. Upon receipt of a priority designation request for a first selected one of the additional services from a user, the mobile terminal designates the first selected additional service as a high-priority service. Upon receipt of an incoming telephone call during a selected second one of the additional services, the mobile terminal determines whether the first selected additional service is identical to the second selected additional service. When the first selected additional service is identical to the second selected additional service, the mobile terminal maintains the selected additional service.