A method for providing a quality of Service QoS-based service in a network server of a wireless communication system, the method comprising: providing, by the network server, a mobile station MS with at least one QoS plan indicating a price policy for a QoS acceleration service in response to a request from the MS for the QoS acceleration service having a higher QoS than a default QoS designated for a user of the MS; providing, by the network server, the MS with an authorized token and a QoS quota based on a QoS plan selected for the QoS acceleration service in response to a purchase request of the MS by receiving from the MS, a purchase request message comprising an application identification information of a QoS acceleration application installed in the MS for the QoS acceleration service, a user identifier for the MS, and a QoS plan selected by the user of the MS, and sending the MS a purchase response message comprising the payment result, a QoS quota based on the authorized token and the QoS plan, and QoS information for providing the QoS acceleration service according to the QoS plan; providing, by the network server, the MS with service contents selected by the user through a radio bearer for the QoS acceleration service; when a usage of the QoS acceleration service reaches a threshold according to the QoS quota, notifying, by the network server, the MS of an impending expiration of the QoS acceleration service; and when the QoS acceleration service has expired, notifying the MS of the expiration of the QoS acceleration service, wherein the authorized token comprises at least one of an identifier indicating an authorization of the QoS acceleration service, a time stamp indicating a start time and an end time for which the radio bearer for the QoS acceleration service may be maintained, and authorized data. providing, by the network server, a mobile station MS with at least one QoS plan indicating a price policy for a QoS acceleration service in response to a request from the MS for the QoS acceleration service having a higher QoS than a default QoS designated for a user of the MS; providing, by the network server, the MS with an authorized token and a QoS quota based on a QoS plan selected for the QoS acceleration service in response to a purchase request of the MS by receiving from the MS, a purchase request message comprising an application identification information of a QoS acceleration application installed in the MS for the QoS acceleration service, a user identifier for the MS, and a QoS plan selected by the user of the MS, and sending the MS a purchase response message comprising the payment result, a QoS quota based on the authorized token and the QoS plan, and QoS information for providing the QoS acceleration service according to the QoS plan; receiving from the MS, a purchase request message comprising an application identification information of a QoS acceleration application installed in the MS for the QoS acceleration service, a user identifier for the MS, and a QoS plan selected by the user of the MS, and sending the MS a purchase response message comprising the payment result, a QoS quota based on the authorized token and the QoS plan, and QoS information for providing the QoS acceleration service according to the QoS plan; providing, by the network server, the MS with service contents selected by the user through a radio bearer for the QoS acceleration service; when a usage of the QoS acceleration service reaches a threshold according to the QoS quota, notifying, by the network server, the MS of an impending expiration of the QoS acceleration service; and when the QoS acceleration service has expired, notifying the MS of the expiration of the QoS acceleration service, wherein the authorized token comprises at least one of an identifier indicating an authorization of the QoS acceleration service, a time stamp indicating a start time and an end time for which the radio bearer for the QoS acceleration service may be maintained, and authorized data.