An apparatus for providing a telematics service including an AGPS function. An initial position measuring time of a telematics system is shortened due to the AGPS function of the telematics service, so the telematics service is rapidly provided to a user. Because the telematics system utilizes satellite ephemeris information and user position information, a reception sensitivity of a GPS signal is improved in a downtown area, in which the GPS signal is attenuated. The telematics system includes an AGPS information processing module for rapidly providing the telematics service to the user.