Disclosed herein are a method of switching a communication mode to voice communication in response to a voice communication request during data communication in a mobile station and a system for managing a service using the same. According to the method and service management system of the present invention, it is possible for a user to make voice communication when the data communication is operating, by notifying a called party in data communication through a short message service (SMS) that a voice communication request is received, switching the data communication in progress to an idle state according to the called party's response to the voice communication request so that the voice communication can be made, and resuming the data communication interrupted during the idle state after the voice communication is terminated.