KR20030068226A - public wireless LAN service system and method using prepaid card - Google Patents

Abstract

PURPOSE: A system and a method for a public wireless LAN service using a prepayment card are provided to make a user use the service conveniently and to easily make a charge for the wireless LAN service of the user. CONSTITUTION: A wireless LAN kiosk(100) includes a wireless LAN access point part(110) connecting to a wireless Internet user terminal(200_1-200_n) and a prepayment card selling part(120) issuing the prepayment card by using a vacant card and a PIN(Personal Identification Number). A prepayment card issuance server(500) is connected to the prepayment card selling part(120), controls a process for issuing the prepayment card, and transfers the PIN to the prepayment card selling part(120). A charge/authentication RADIUS(Remote Authentication Dial-In User Services) server(300) is connected to the access point part(110) and carries out the authentication for the user wanting to use the wireless LAN service and the charge of the wireless LAN service. A prepayment card issuance database(400) is respectively connected to the prepayment card issuance server(500) and the charge/authentication RADIUS server(300), and stores the prepayment card information.

Description

Public wireless LAN service system using prepaid card and its method {public wireless LAN service system and method using prepaid card}

The present invention relates to a public wireless Internet service system using a prepaid card and a method thereof, and more particularly to a system and method for providing a prepaid card sales and wireless Internet service using a public telephone.

Recently, as the Internet, notebook computers, and portable mobile communication devices become more common, more convenient mobility and remoteness are required in general computing environments. Wireless LAN technology is used as a computer network to guarantee such mobility and remoteness. Wireless LAN refers to building a network environment from a hub to each terminal using radio frequency or light instead of a wired cable in an indoor or outdoor environment such as an office, a shopping mall, or a home. Wireless LAN is rapidly spreading due to its advantages such as no wiring, easy relocation of terminals, communication on the go, and network construction in a short time.

A basic WLAN network is a wireless network interface card (NIC) installed in each terminal for connecting to another wireless terminal or a wired LAN, an access point (AP) serving as a gateway between each terminal and the wired network, and a building It is composed of bridge equipment used to connect between the building and distributed or distributed network segments. The access point plays a role similar to that of a LAN hub, and may access and use 25 to 50 terminals simultaneously in an area of about 20 to 150 m in radius per one access point.

As the demand for mobility and convenience of users increases, the use of wireless LAN is expanding not only in the traditional applications such as hotels, coffee shops, convention centers, airports, department stores, warehouses, but also in schools, PC rooms, and general enterprises. . Meanwhile, the public wireless LAN service has been made possible by allowing carriers to use the ISM band, which has been available only for personal use, for commercial use. The public wireless LAN service installs several access point equipment covering a certain area, and users only need a laptop equipped with a wireless LAN NIC or a personal digital assistant (PDA). By providing convenient wireless access to the Internet anywhere in the area, if these services are implemented, the mobility and convenience of the user computing environment will be maximized.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object thereof is to provide a new public wireless LAN service system and a method thereof that can be conveniently used by a user.

Another object of the present invention is to provide a system and a method for facilitating user's wireless LAN service use and billing.

Another object of the present invention is to provide a system and method for conveniently issuing a prepaid card that can be used for various purposes, including wireless Internet services.

1 is a view showing the overall configuration of a public wireless LAN service system of the present invention.

FIG. 2 is a diagram illustrating in more detail a portion related to issuance of a prepaid card in the system of FIG. 1.

3 is a flowchart illustrating a process of issuing a prepaid card using the system of FIG. 2.

4 is a view illustrating in more detail the portion related to the wireless Internet service in the system of FIG.

5 is a flowchart illustrating a process of providing a wireless Internet service using the system of FIG. 4.

Explanation of symbols on the main parts of the drawings

100, 100_PP, 100_AP: WLAN Kiosk

110: wireless LAN access point unit 120: prepaid card sales unit

200_1, 200_2, .., 200_n: wireless internet user terminal

300: RADIUS server for billing / authentication 700: Internet

400: prepaid card issue DB500: prepaid card issue server

600_1, 600_2, .., 600_n: backbone carrier

610_1, 610_2, .., 610_n: computer system of backbone carrier

620_1, 620_2, .., 620_n: Network of backbone carrier

In order to achieve the above object, in the present invention, a user can use a wireless Internet access service using a prepaid card purchased by a user using a wireless LAN kiosk equipped with a wireless LAN access point unit and a prepaid card sales unit. The WLAN kiosk can be configured using a public telephone.

That is, the system for providing a public wireless LAN service according to the present invention includes a wireless LAN access point unit, a blank card, and a personal identification number (PIN) to which a wireless Internet user terminal equipped with a wireless LAN network interface card can connect wirelessly. A wireless LAN kiosk including a prepaid card sales unit capable of issuing a prepaid card by using a pre-paid card issuing process connected to the prepaid card sales unit of the wireless LAN kiosk through a communication network. It is connected to the access point of the wireless LAN kiosk through a prepaid card issuing server, a communication network for controlling and issuing the individual identification number required for issuing a prepaid card and delivering it to the prepaid card sales unit of the wireless LAN kiosk. Wireless LAN service by accessing the access point unit Connect with a remote authentication dial-in user services (RADIUS) server, a prepaid card issuing server, and the RADIUS server for billing / authentication for charge / authentication of a user who wants to use and billing of a wireless LAN service. The prepaid card issuing server includes a prepaid card issuing database that stores prepaid card information including at least one of an individual identification number, type, issuance date, issuance amount, usage history, and balance of the prepaid card. It is connected to the system of the carrier that sells the prepaid card and interacts with the system of the carrier to control the process of issuing the prepaid card, and the billing / authentication RADIUS server is connected to the carrier's network to use the wireless LAN service. Control the user to access the Internet through the telecommunications network.

The prepaid card sales unit is connected to the prepaid card issuing server through a public telephone network, and the access point unit includes a cable TV (CATV) line or a digital subscriber line (DSL). It is preferable to be connected to the charging / authentication RADIUS server through a circuit network.

The wireless LAN kiosk may further include a telephone terminal unit providing a function of a public telephone, and the telephone terminal unit may provide a telephone service using a line connected with the access point unit or a line connected with the prepaid card sales unit. .

The public WLAN service providing method according to the present invention may issue a prepaid card using a WLAN access point unit, a blank card, and an individual identification number to which a wireless Internet user terminal having a WLAN network interface card can wirelessly access. A wireless LAN kiosk including a prepaid card sales unit, a prepaid card issuing server connected to a system of a prepaid card sales unit and a prepaid card selling the prepaid card of the wireless kiosk through a communication network, the wireless LAN kiosk through a communication network It is connected to the access point unit, and is responsible for authentication of the user who wants to use the wireless LAN service by accessing the access point unit and billing of the used wireless LAN service, and connected to the communication network of the carrier to use the wireless LAN service. The user who wants to It is connected to the billing / authentication RADIUS server, the prepaid card issuing server, and the billing / authentication RADIUS server, respectively, which controls access to the Internet through the network, and the individual identification number, type, issue date, and issue amount of the prepaid card. A public wireless LAN service is provided by using a public wireless LAN service providing system including a prepaid card issuing database that stores prepaid card information including at least one of a service history, a balance, and a balance. Entering the service area of the wireless LAN kiosk and connecting the wireless Internet terminal of the user to the billing / authentication RADIUS server through the wireless LAN kiosk; the individual identification number as the user inputs the individual identification number of the prepaid card. Is transmitted to the charging / authentication RADIUS server, the charging / authentication R Inquiring the prepaid card issuing database using the individual identification number transmitted from the ADIUS server to authenticate the user, and determining whether there is a balance for using the wireless Internet service, and providing the wireless Internet service as a result of the authentication and balance inquiry. If it is determined that it can be done, connecting the user's wireless Internet terminal through the wireless LAN kiosk and the billing / authentication RADIUS server to a communication network providing a service for connecting to the Internet, when the use of the service is terminated And collecting the wireless internet service fee by recording the amount of the prepaid card in the prepaid card issuance database by subtracting the fee for using the service from the balance of the prepaid card.

In addition, as the user inputs a prepaid card purchase request through the prepaid card sales unit of the wireless LAN kiosk, the prepaid card purchase request from the user is delivered to the prepaid card issuing server, and the user pays the fee according to the prepaid card purchase. Issuing an individual identification number for a prepaid card to be sold by referring to the prepaid card issuing database at the prepaid card issuing server, and then transmitting the issued individual identification number to the prepaid card sales unit of the wireless LAN kiosk. The method may further include printing the individual identification number delivered to the prepaid card sales unit on a blank card, and issuing a prepaid card printed with the individual identification number to a user.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Figure 1 is a schematic diagram showing the overall configuration of the public wireless LAN service system of the present invention, the public wireless LAN service system of the present invention largely prepaid with the wireless LAN kiosk 100, which also serves as an access point and prepaid card vending machine of the public wireless LAN service It includes three devices: a prepaid card issuing server 500 that controls the card issuing process and a billing / authentication RADIUS server 300 that is responsible for authentication and billing for the wireless LAN service.

Wireless LAN kiosk 100 of the present invention can be configured using a public telephone installed in the existing, largely comprises a wireless LAN access point unit 110 and prepaid card sales unit 120. The WLAN access point unit 110 may allow a wireless Internet user terminal 200_1, 200_2,..., 200_n such as a notebook computer equipped with a WLAN NIC or a WLAN PDA to access a network according to a WLAN standard such as 802.11. The prepaid card sales unit 120 is a module for controlling a user to automatically sell a prepaid card used to use a wireless internet service and / or various other communication services provided through the wireless LAN kiosk 100.

In order to use the wireless Internet service of the present invention, a user having the wireless Internet user terminal 200_1, 200_2, .., 200_n first purchases a prepaid card for the wireless Internet service through the wireless LAN kiosk 100 and then uses the same. If you have a wireless Internet service, and already have a prepaid card for wireless Internet service, you can use the wireless Internet service using the personal identification number of the prepaid card.

Meanwhile, the prepaid card issuing server 500 and the billing / authentication RADIUS server 300 are simultaneously connected to the prepaid card issuing DB 400. The prepaid card issuing DB 400 stores information on the prepaid card issued through the prepaid card issuing server 500, such as the PIN, type, issuance date, issuance amount, usage history and balance of the prepaid card. That is, when the prepaid card is first issued by the prepaid card issuing server 500, the information according to the prepaid card issuance is recorded in the prepaid card issuing DB 400, and the billing / authentication RADIUS server 300 issues the prepaid card. The information stored in the DB is used to authenticate the user who wants to use the wireless Internet service and to settle the charge for the wireless Internet service.

In addition, the prepaid card issuing server 500 and the billing / authentication RADIUS server 300 are connected to a number of backbone carriers 600_1, 600_2, .., 600_n for issuing prepaid cards and providing wireless Internet services, respectively. have. The prepaid card issuing server 500 may be connected to each of the telecommunication carriers 600_1, 600_2, .., 600_n systems to issue a prepaid card issued and used by each telecommunications carrier, and RADIUS server for billing / authentication. 300 allows a user to access the Internet 700 through a network of each of the telecommunication carriers 600_1, 600_2,..., 600_n.

The connection between the wireless LAN kiosk 100 and the billing / authentication RADIUS server 300 and / or the prepaid card issuing server 500 may be made in various ways. In FIG. 1, the prepaid card sales unit 120 of the wireless LAN kiosk 100 is connected to the prepaid card issuing server 500 through a public switched telephone network (PSTN) and the wireless LAN access point unit 100. ) May be connected to the RADIUS server 300 for billing / authentication via xDSL and various dedicated circuits such as a cable TV network or an asymmetric digital subscriber line (ADSL).

When configuring a wireless LAN kiosk of the present invention using an existing public telephone, various lines for wireless Internet service may be used together as a line for public telephone service, and a public telephone network connected to a prepaid card issuing server is used. Can also be used for services. In the latter case, when the PSTN is connected to the PSTN using the wireless LAN kiosk 100, another exchange or prepaid card issuing server 500 in the PSTN is passed through an exchange (not shown) according to the type of service (public telephone service / prepaid card sales service). Leads to. In addition, it is possible to configure to use both a public telephone service, a prepaid card issuing service, and a wireless Internet service using one communication line.

Now, the wireless Internet service system and method using the prepaid card of the present invention will be described in more detail by dividing the prepaid card issuing process and the wireless Internet service process. First, the prepaid card issuing system and its method will be described.

FIG. 2 is a block diagram illustrating only a part related to issuance of a prepaid card in the system of FIG. 1 in more detail, and FIG. 3 is a flowchart illustrating a process of issuing a prepaid card using the system of FIG. 2.

As shown in FIG. 2, the wireless LAN kiosk 100_PP performing the prepaid card issuing function is connected to the prepaid card issuing server 500 through a network such as a PSTN, and the prepaid card issuing server 500 is prepaid on the one hand. On the other hand, the card issuing DB 400 is connected to the prepaid card issuing systems 610_1, 610_2,. The wireless LAN kiosk 100_PP performing the prepaid card issuing function has a plurality of blank cards (not shown) that do not have a PIN.

A user who wants to purchase a prepaid card using the wireless LAN kiosk (100_PP), first applies for a prepaid card purchase using the wireless LAN kiosk (100_PP) (S310). The user interface for prepaid card purchase application may be implemented in various ways. For example, when a user picks up a handset of a public telephone and separately prepares or presses a prepaid card purchase button specially designated from the keypad of the telephone, an automatic answering service (ARS; An automatic response system may be used to voice a prepaid card issuance or a separate user input device such as a touch screen may be used to perform a prepaid card sales process. If there are two or more types of prepaid cards that can be sold using the wireless LAN kiosk (100_PP), the process of selecting the types of prepaid cards to purchase should be included in the prepaid card purchase application step (S310). In addition, the process of determining the amount of the prepaid card may also be included in this step (S310).

The user's application for prepaid card purchase is forwarded through the prepaid card issuing server to the carrier's system (610_1, 610_2, .., 610_n) that issues the prepaid card, and the user prepaid upon request for payment of the prepaid card. Pay the card fee (S320).

Payment of prepaid card fees can use any method used to pay public telephone bills in existing public telephones. In other words, prepaid card fees can be paid using cash and credit cards, and other forms of prepaid cards (e.g., public telephone cards of KT) can be paid.

In order to process the prepaid card billing process, the prepaid card issuing server 500 and the systems of the prepaid card issuing carriers 610_1, 610_2, .., 610_n may also be connected to a server 900 of a financial institution such as a bank. Can be.

When the payment for the prepaid card fee is completed, the prepaid card issuing server issues a PIN for the prepaid card to be sold by referring to the prepaid card issuing DB and transmits the PIN to the wireless LAN kiosk 100_PP having the prepaid card selling function (S330). ).

When the issued PIN is transmitted to the wireless LAN kiosk 100_PP, the wireless LAN kiosk 100_PP prints the issued PIN on the blank card stored (S340). To this end, a wireless LAN kiosk having a prepaid card sales function is provided with an output module capable of performing a PIN printing function.

Now, the prepaid card printed with the PIN is delivered to the user, and the user can use the purchased prepaid card in a wireless Internet service or the like (S350).

In the embodiments described so far, whenever the prepaid card is sold using the wireless LAN kiosk, the prepaid card issuing server delivers the prepaid card issuance application to the system of the carrier that issues the prepaid card. However, the prepaid card is not required. . The prepaid card issuing server can control the prepaid card issuing process by using the information contained in the prepaid card issuing DB, and the result information of issuing the prepaid card is delivered to the communication service provider system periodically or irregularly. You may want to achieve your goals.

Next, a wireless internet service system and a method thereof will be described.

4 is a block diagram illustrating only a part related to a wireless Internet service in more detail in the system of FIG. 1, and FIG. 5 is a flowchart illustrating a process of providing a wireless Internet service using the system of FIG. 4.

As shown in FIG. 4, the wireless LAN kiosk 100_AP for providing a wireless Internet service according to the present invention is an access point for allowing user terminals 200_1, 200_2, .., 200_n having a wireless LAN NIC to access the Internet. Plays a role. That is, when a user having a wireless Internet terminal enters the service area of the wireless LAN kiosk 100_AP (S510), the wireless Internet terminals 200_1, 200_2, .., 200_n of the user are charged through the wireless LAN kiosk 100_AP. It is connected to / RADIUS server 300 for authentication (S520). The user inputs the PIN of the prepaid card held for using the wireless Internet service (S540) according to the request of the charging / authentication RADIUS server 300 (S540).

The billing / authentication RADIUS server 300 performs an authentication procedure using the PIN entered by the user and checks whether the balance of the prepaid card is sufficient according to the information entered by the user by querying the prepaid card issuing DB 400. (S550).

If it is determined that the balance is sufficient, the user 200_1, 200_2, .., 200_n is connected to the communication provider's network (620_1, 620_2, .., 620_n), and the user has a communication network (620_1, 620_2,. 620_n) may be connected to the Internet network 700 to use a wireless Internet service (S560).

As long as the user uses the service (based on usage time or usage amount), the service use amount is collected from the prepaid card provided by the user (S570). The amount of service used can be determined in various ways according to the needs of the telecommunications operators and the wireless LAN kiosk operators, and the price is usually set in packet units. Such charges are recorded in the prepaid card issuance DB 400 (S580).

Meanwhile, the wireless LAN kiosk 100_AP for providing a wireless Internet service according to the present invention includes an access point module serving as a gateway between each terminal and a wired network and an ADSL module for connecting the wireless LAN kiosk to another wired network. Doing.

The ADSL module, which has the same function as the existing ADSL modem, serves to transfer data with the existing telephone line using a two-wire subscriber telephone line.

Next, the AP module has an authentication function for the user in addition to the gateway function for the WLAN user. Suitable NICs for connection through AP modules are personal computer memory card international association (PCMCIA) cards used in notebook computers and PDAs, universal serial bus (USB) devices used in personal computers or notebook computers, and embedded in personal computers. And a peripheral component interconnect (PCI) card.

As such, since the ADSL module and the AP module are provided together in the wireless LAN kiosk (100_AP), there is no need to purchase each equipment separately, and the installation of the wireless LAN kiosk (100_AP) becomes very easy. Such a wireless LAN kiosk (100_AP) is very suitable for wireless LAN services for public places, can remotely control the configuration and management of the AP, user authentication (authentication), roaming (QoS), quality of service (QoS) quality of service) function.

It will now be described in detail how each of these functions are implemented within the WLAN Kiosk 100_AP of the present invention.

First of all, roaming is a function that can be connected to one AP and continue to use the network after moving to another AP. Currently, roaming is limited to only services that do not need to maintain a session while continuing a service, such as a web service. .

The wireless LAN kiosk 100_AP includes a network address translation (NAT) router module supporting a dynamic host configuration protocol (DHCP) and performs VLAN (virtual LAN) tagging. Support. Related international standards include 802.11d for supporting international roaming and 802.11f for defining an inter-access point protocol (IAPP), and the wireless LAN kiosk 100_AP of the present invention satisfies these protocols.

The wireless LAN kiosk 100_AP of the present invention uses an authentication method using 802.1x, which is a user authentication protocol being enacted as an IEEE standard. The 802.1x operation method is a protocol method that relays different authentication methods from two other networks. The user side uses PPP extensible authentication protocol (EAP) over LAN and the authentication server side uses EAP over RADIUS. . That is, the user's wireless Internet terminals 200_1, 200_2, .., 200_n and the wireless LAN kiosk 100_AP are EAP over LAN, and the wireless LAN kiosk 100_AP and the billing / authentication RADIUS server 300 are EAP over. Communicate in RADIUS mode. EAP is a general authentication protocol for the point-to-point protocol (PPP), the AP is a public key certificate, smart card, Kerberos, one-time It allows the use of various authentication mechanisms such as one-time passwords and biometrics.

The present invention has been described in detail with reference to preferred embodiments, but the scope of the present invention is not limited thereto, and should be interpreted by the following claims. In addition, it will be understood by those skilled in the art that various modifications or changes may be made without departing from the spirit of the present invention.

As described above, according to the present invention, a wireless LAN kiosk capable of providing a prepaid card vending machine and a public wireless Internet access service using an existing public telephone can be configured. This wireless LAN kiosk makes it easy to issue and sell various kinds of prepaid cards, and to facilitate the billing and authentication process when providing wireless internet access services using prepaid cards. Becomes possible. Users can use the Internet access service without using a wireless LAN kiosk installed in a public place to maximize the mobility and portability of the computing environment.

Claims (9)

Issuing a prepaid card using a wireless LAN access point unit, a blank card, and a personal identification number (PIN), to which a wireless Internet user terminal equipped with a wireless LAN network interface card (NIC) can access wirelessly. Wireless kiosk with prepaid card sales department, It is connected to the prepaid card sales unit of the wireless LAN kiosk through a communication network, and controls the prepaid card issuing process according to a prepaid card sales request from the user and issues the individual identification number required for issuing the prepaid card to the wireless LAN kiosk. Prepaid card issuing server to deliver to the prepaid card sales department, A billing / authentication RADIUS that is connected to the access point of the wireless LAN kiosk through a communication network and is responsible for authentication of a user who wants to use the wireless LAN service by accessing the access point and charging of the used wireless LAN service. remote authentication dial-in user services server, It is connected to the prepaid card issuing server and the billing / authentication RADIUS server, respectively, and stores prepaid card information including at least one of an individual identification number, type, issue date, issue amount, usage history, and balance of the prepaid card. Includes a prepaid card issuance database, The prepaid card issuing server is connected to a system of a telecommunications provider selling the prepaid card and interacts with the system of the telecommunications operator to control the prepaid card issuing process, The charging / authentication RADIUS server is connected to a communication network of a communication service provider to provide a public wireless LAN service providing a user who wants to use the wireless LAN service to access the Internet through the communication network of the service provider. The method of claim 1, The prepaid card sales unit of the wireless LAN kiosk is connected to the prepaid card issuing server through a public telephone network. The method of claim 1, The access point of the wireless LAN kiosk is a public wireless LAN connected to the billing / authentication RADIUS server through a dedicated circuit including a cable TV (CATV) line or a digital subscriber line (DSL). Service delivery system. The method of claim 1, The wireless LAN kiosk is a public wireless LAN service providing system further comprises a telephone terminal for providing a function of a public telephone. The method of claim 4, wherein The access point of the wireless LAN kiosk is connected to the billing / authentication RADIUS server through a dedicated line including a cable TV (CATV) line or a digital subscriber line (DSL). And the telephone terminal unit of the wireless LAN kiosk provides a telephone service using a line connected to the access point unit. The method of claim 4, wherein The prepaid card sales unit of the wireless LAN kiosk is connected to the prepaid card issuing server through a public telephone network, And the telephone terminal unit of the wireless LAN kiosk provides a telephone service using a line connected to the prepaid card sales unit. A wireless LAN kiosk including a wireless LAN access point unit for wireless access to a wireless Internet user terminal equipped with a wireless LAN network interface card, and a prepaid card sales unit for issuing a prepaid card using a blank card and an individual identification number. A prepaid card issuing server connected to a system of a telecommunications operator selling the prepaid card sales unit and the prepaid card of the wireless LAN kiosk through a communication network; It is connected to the access point unit of the wireless LAN kiosk through a communication network, and is responsible for authentication of the user who wants to use the wireless LAN service by accessing the access point unit and charging of the used wireless LAN service. Billing / authentication RADIUS server that controls the users who want to use the wireless LAN service connected to the internet connection through the communication network of the service provider, It is connected to the prepaid card issuing server and the billing / authentication RADIUS server, respectively, and stores prepaid card information including at least one of an individual identification number, type, issue date, issue amount, usage history, and balance of the prepaid card. A public wireless LAN service providing method using a public wireless LAN service providing system including a prepaid card issuing database, A user having a wireless Internet terminal enters a service area of the wireless LAN kiosk, and the user's wireless Internet terminal is connected to the charging / authentication RADIUS server through the wireless LAN kiosk; As the user enters the individual identification number of the prepaid card, the individual identification number is delivered to the billing / authentication RADIUS server, Querying the prepaid card issuing database using the individual identification number delivered from the billing / authentication RADIUS server to authenticate the user, and determining whether there is a balance for using a wireless Internet service; If it is determined that the wireless Internet service can be provided as a result of the authentication and balance inquiry, the user's wireless Internet terminal is connected to a communication network of a telecommunication service provider that provides a connection service to the Internet through the wireless LAN kiosk and the billing / authentication RADIUS server. Connecting step, When the use of the service is terminated, the public wireless LAN service providing comprising the step of collecting the charges for the use of the service from the balance of the prepaid card by using the prepaid card balance in the prepaid card issuing database to collect the wireless Internet service fee Way. The method of claim 7, wherein As a user inputs a prepaid card purchase request through the prepaid card sales unit of the wireless LAN kiosk, a prepaid card purchase request from the user is delivered to the prepaid card issuing server; Issuing an individual identification number for a prepaid card to be sold by referring to the prepaid card issuing database in the prepaid card issuing server as a user pays a fee for purchasing a prepaid card; The issued individual identification number is transmitted to the prepaid card sales unit of the wireless LAN kiosk, Printing the individual identification number delivered to the prepaid card sales unit on a blank card; The public wireless LAN service providing method further comprising the step of issuing a prepaid card printed with the individual identification number. A wireless LAN kiosk including a wireless LAN access point unit for wireless access to a wireless Internet user terminal equipped with a wireless LAN network interface card, and a prepaid card sales unit for issuing a prepaid card using a blank card and an individual identification number. A prepaid card issuing server connected to a system of a telecommunications operator selling the prepaid card sales unit and the prepaid card of the wireless LAN kiosk through a communication network; It is connected to the access point unit of the wireless LAN kiosk through a communication network, and is responsible for authentication of the user who wants to use the wireless LAN service by accessing the access point unit and charging of the used wireless LAN service. A RADIUS server for billing / authentication that controls users' access to the Internet through the telecommunications network of users who want to use the wireless LAN service connected to It is connected to the prepaid card issuing server and the billing / authentication RADIUS server, respectively, and stores prepaid card information including at least one of an individual identification number, type, issue date, issue amount, usage history, and balance of the prepaid card. A prepaid card selling method using a public wireless LAN service providing system including a prepaid card issuing database, As a user inputs a prepaid card purchase request through the prepaid card sales unit of the wireless LAN kiosk, a prepaid card purchase request from the user is delivered to the prepaid card issuing server; Issuing an individual identification number for a prepaid card to be sold by referring to the prepaid card issuing database in the prepaid card issuing server as a user pays a fee for purchasing a prepaid card; The issued individual identification number is transmitted to the prepaid card sales unit of the wireless LAN kiosk, Printing the individual identification number delivered to the prepaid card sales unit on a blank card; Issuing a prepaid card printed with the individual identification number to a user.