KR100953530B1 - Public Phone System and Public Phone Service Method Using VoIP - Google Patents

Abstract

A public telephone system and a public telephone service method using VoIP are disclosed. The disclosed system includes a plurality of public telephone booths having a VoIP terminal and a data communication device installed therein and installed in various places in combination with a communication network; A central control server coupled to the plurality of public telephone booths and a communication network, the central control server providing additional information to the public telephone booths, wherein each of the plurality of public telephone booths is provided with a display device; The additional information provided from the central control server is displayed, and the VoIP service is provided through the VoIP terminal. According to the disclosed system, it is possible to improve the use of the public telephone, and to receive various information in the public telephone booth while minimizing the trouble of using the public telephone and minimizing the cost of using the telephone.

Public telephone, VoIP, video, central control server system

Description

Public Phone System and Public Phone Service Method Using VoIP}

The present invention relates to a public telephone system and a public telephone service method, and more particularly, to a public telephone system and a public telephone service method in which VoIP communication is introduced.

The telecommunications market continues to grow rapidly, and most people now use more than one cell phone, which has become a necessity in modern society. Mobile communication technology continued to develop, and initially only voice calls and simple text messages were available. Recently, due to the development of data communication using mobile phones, video calls and large data transfers are also made through mobile phones. The proportion of mobile phones continues to rise.

Due to the development of mobile communication terminals, the use of genetic telephones using public switched telephone networks (PSTNs) continues to decrease. In particular, even though the call cost of the oilfield phone is much cheaper, users are using expensive mobile phones even where wired phones are installed.

According to this trend, public telephones installed in public places are rarely used, and have been reduced to useless facilities that occupy only space without any utilization.

Today's users are talking on their cell phones, even though a payphone is installed next to them, which reflects the current trend of ease of use rather than interest in call charges.

The sharp drop in the use of payphones is not only inconvenient to use, but also the cumbersome billing system of payphones. Payphones require paying phone bills using coins or phone cards, which are often more expensive than credit cards and do not have coins in advance, and it is cumbersome to recharge them. For this reason, mobile phones were used even if a pay phone was installed next to it.

Along with the cumbersome billing system, the fact that the existing public telephones could not provide multimedia communication reflecting the recent trend also contributed to the drastic decrease in public telephone use. In recent years, various data such as video and music are provided through mobile phones as well as voice calls. However, existing public phones can only make voice calls in the booth. As users become indifferent to the cost of the call, public phones have become an unnecessary facility.

On the other hand, Voice over Internet Protocol (VoIP) is a technology that converts voice into Internet protocol data packet to enable a call and uses a packet network (Internet network) for data communication that has been used in the past. By using this, not only data but also voice is transmitted to the IP network so that calls can be made through the Internet without a separate telephone network.

The use of the Internet network has the advantage of significantly lowering international or long distance charges to the level of free or local calls. As call quality improves with VoIP, companies are increasingly demanding to reduce costs.

In recent years, VoIP has evolved into an integrated multimedia application that not only provides voice calls but also supports voice / data / video.

In order to solve the problems of the prior art as described above, the present invention proposes a public telephone system and a public telephone service method using VoIP, which can improve the use of public telephones.

Another object of the present invention is to propose a public telephone system and a public telephone service method using VoIP, which can minimize the inconvenience of using a public telephone.

Another object of the present invention is to propose a public telephone system and a public telephone service method using VoIP capable of multimedia communication.

Still another object of the present invention is to propose a public telephone system and a public telephone service method using VoIP, which can receive various information in a public telephone booth.

Other objects of the present invention will be readily apparent to those skilled in the art through the following examples.

In order to achieve the above object, according to an aspect of the present invention, a plurality of public telephone booths are provided inside the VoIP terminal and the data communication device and installed in various places in combination with the communication network; A central control server coupled to the plurality of public telephone booths and a communication network, the central control server providing additional information to the public telephone booths, each of which is equipped with a display device; Provided is a public telephone system using VoIP, which displays additional information provided from the central control server through the VoIP terminal and provides a call service using the VoIP method through the VoIP terminal.

Each of the plurality of public telephone booths further includes a camera for capturing a user and supporting a video call on the captured image.

The display device is preferably located within the field of view of the user looking at the camera.

The additional information may include advertisement information, news information, and public relations information.

The public telephone booth is grouped into a plurality of groups according to local characteristics and user characteristics used, and the central control server provides additional information corresponding to the characteristics of each group.

The central control server generates additional information schedule data corresponding to each group and provides the same to the data communication apparatus of the public telephone booth, wherein the public telephone booth displays the additional information provided from the central control server based on the schedule data. do.

The central control server generates additional information schedule data corresponding to each group, and broadcasts additional information for each group through a communication network based on the schedule data.

The additional information includes image information and text information, and the display device independently displays the image information and text information.

The display device includes an LCD screen and an LED screen, the image information is displayed on the lower surface of the LCD, and the text information is displayed on the LED screen.

Preferably, the additional information includes advertisement information and the VoIP terminal operates free of charge without requiring the user to be charged.

The image photographed by the camera and the camera photographed image of the call counterpart are displayed together with the additional information on the display device.

The camera continuously photographs the inside of the local booth equipment to monitor the breakage inside the equipment.

The data communication device of the local booth equipment transmits the usage history of the VoIP terminal and additional information exposed during the call to the central control server.

According to another aspect of the present invention, a public telephone service method in a VoIP public telephone system including a central control server, the VoIP terminal and a plurality of public telephone booths having a data communication device and connected to the central control server through a communication network. (A) storing additional information data in the central control server; Generating schedule data of a reproduction order of the additional information at the central control server; And transmitting (c) the additional information data from the central control server to the public telephone booth, wherein the display device provided in the public telephone booth reproduces and displays the additional information based on the schedule data. A public telephone service method in a public telephone system is provided.

The public telephone booth is grouped into a plurality of groups according to local characteristics and user characteristics used, and the central control server provides additional information corresponding to the characteristics of each group.

The additional information includes image information and text information, and the display device independently displays the image information and text information.

The display device includes an LCD screen and an LED screen, the image information is displayed on the lower surface of the LCD, and the text information is displayed on the LED screen.

According to the present invention, it is possible to improve the use of the public telephone, which is recently specified, and in particular, to increase the use of the low-income class, and to minimize the trouble of using the public telephone.

In addition, by using the VoIP method, there is an advantage in that a variety of information can be provided in a public telephone booth while minimizing the cost of using a telephone.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of a public telephone system and a public telephone service method using VoIP according to the present invention.

1 is a diagram showing the configuration of a public telephone system using VoIP according to an embodiment of the present invention.

Referring to FIG. 1, a public telephone system using VoIP according to an embodiment of the present invention includes a plurality of public telephone booths 102, 104, 106, and 108 connected through a communication network with a central control server 100 and a central control server. ) May be included.

Each public telephone booth 102, 104, 106, 108 is provided with a VoIP public terminal. The VoIP public terminal can use general signaling protocols such as H.323, SIP (Sessin Initiation Protocol), and MGCP (Medai Gateway Control Protocol) as a signaling protocol.It converts the user's voice into digital data and transmits it to the Internet network. It converts voice digital data of the other party to analog data and outputs it.

Network connection configuration of the VoIP terminal for VoIP communication will be described in detail with reference to the separate drawings.

The public telephone booth in which the VoIP public terminal is accommodated may be installed in various places as in the conventional public telephone booth. For example, people can be installed in various places such as public institutions, large buildings, large marts, airports, apartment complexes, subway and railway history, bus stops, universities.

The public telephone booth houses not only VoIP terminals but also data communication devices capable of communicating with a central control server via a communication network. The VoIP terminal and the data communication device may be integrally provided inside the public telephone booth or may be provided as a separate device inside the public telephone booth.

Here, the data communication device inside the public telephone booth and the central control server 100 can transmit and receive data in various ways, and the communication network includes both a wired network such as the Internet network and a private network, as well as a wireless communication network such as a mobile communication network and a WLAN. You can do it. Preferably, the data communication apparatuses of the public telephone booths 102, 104, 106, and 108 and the central control server 100 may perform data transmission / reception by the TCP / IP protocol through the Internet network.

The central control server 100 provides additional information to the public telephone booth through a communication network. Here, the additional information includes moving picture information, text information, and image information in terms of the form of information, and the additional information transmitted from the central control server 100 is displayed inside the public telephone booth.

In view of the content of the information, the additional information may include various information such as advertisement information, news information, public information on public institutions, various announcement information, and the like.

According to a preferred embodiment of the present invention, the central control server 100 provides differentiated additional information by using characteristic information such as the area where the public telephone booth is used, the user floor and the time using the public telephone booth, and the like.

For example, if a public telephone booth is installed in a public institution, the central control server 100 may transmit additional information on publicity and usage guidance for the public institution.

As another example, when a public telephone booth is installed at a bus stop in front of a school, advertisement information about a product that satisfies a student's taste may be transmitted.

That is, the central control server 100 provides an environment in which the user can make a call without boring inside the public telephone booth by providing additional information that is suitable for the local characteristics of the public telephone booth and the taste of the user using the public telephone. do.

According to an embodiment of the present invention, the additional information data may be transmitted using the RPC scheme, and according to another embodiment of the present invention, real-time transmission of the additional information data such as broadcasting may be performed.

In addition, according to a preferred embodiment of the present invention, a billing system may be employed that is provided from the business owner providing additional information and does not require a separate call fee to the user. Internet phone call using VoIP requires considerably less call cost than existing PSTN communication network and mobile communication network. Thus, billing system can be adopted.

As discussed in the prior art, the conventional cumbersome charging method of charging a call cost by a coin or a telephone card has been a major cause for allowing a user to use a mobile phone even when a public telephone booth is next to it.

According to the present invention, the user can make a call free of charge without the troublesome call cost work as in the prior art, and can induce the user to use the public phone more actively.

Cameras are installed in the public telephone booths 102, 104, 106 and 108. The camera takes a picture of a user using a telephone, and a VoIP terminal installed in a public telephone booth transmits the captured image information to a terminal of a call counterpart via an internet network. By installing the camera inside the public telephone booth, the user can transmit image information together with the audio information, thereby enabling multimedia communication by public telephone.

2 is a block diagram showing the module configuration of a central control server according to an embodiment of the present invention.

2, the central control server according to an embodiment of the present invention includes an image / text storage unit 200, an image transmission unit 202, a text transmission unit 204, a schedule data generation unit 206, and a schedule. The data transmitter 208, the group manager 210, and the statistical information manager 212 may be included.

The image / text storage unit 200 functions to store image data and text data provided to each public telephone booth as additional information. According to an embodiment of the present invention, the image / text storage unit 200 may be connected to a server of a company providing additional information through a network to directly receive and store image and text information. According to another embodiment of the present invention, the system administrator may store the image data and the text data in the central control server through the administrator computer.

The group manager 202 manages a plurality of public telephone booths connected to the central control server through a communication network for each group, and manages address information of the public telephone booths belonging to each group. Here, the address information may include an IP address and a port number assigned to the VoIP terminal provided in each public telephone booth.

As described above, according to a preferred embodiment of the present invention, the additional information is differentiated in consideration of the location characteristics of the public telephone booth or the user characteristics using the public telephone booth, and for this purpose, a plurality of public telephone booths are provided. Manage in separate groups.

For example, public telephone booths in public company buildings, public phone booths in schools, public phone booths in public institutions, public phone booths in apartment complexes, and public spaces based on user characteristics Telephone booths can be grouped. The grouping method may be set by those skilled in the art in various ways, and the group manager 202 classifies each public telephone booth connected through a communication network into groups and manages public telephone booths belonging to each group according to a preset grouping method.

The schedule data generation unit 206 generates schedule information related to the type of additional information to be displayed in the public telephone booth installed in the public telephone booth and the time when the additional information is to be displayed.

Since public pay booths are grouped based on local and user characteristics, the schedule data generator 208 preferably generates separate schedule data for each group.

According to an embodiment of the present invention, the schedule data may be generated based on control information input by an administrator. The administrator may directly input the additional information corresponding to each group and the time of the additional information, and schedule data may be generated based on the information input by the administrator.

According to another embodiment of the present invention, the schedule data may be generated based on a preset scheduling algorithm. For example, the characteristic information about the characteristic of the additional information may be allocated for each additional information, and the play time of the additional information and the additional information to be provided for each group may be set by a preset algorithm based on the characteristic information. have. To this end, when the additional information is stored in the image / text storage unit 200, a process of inputting the characteristic information of the additional information as the header information may be additionally performed, and the characteristic information of each additional information may be managed by a separate database. Could be

The image transmitting unit 202 functions to transmit image information among the additional information to the data communication apparatus provided in the public telephone booth based on the schedule data.

According to an embodiment of the present invention, the image transmitter 202 may transmit image information by a general unicast transmission method. In addition, the image transmitter 202 transmits image information based on schedule data for each group. For example, when data is transmitted to a public telephone booth belonging to group A, the public telephone belonging to group A is extracted by extracting the image information recorded in the schedule data generated corresponding to the group A from the image information stored in the image / text storage unit. Transfer to the booth.

When the image information is first transmitted to the public telephone booth and then stored as in the above-described embodiment, the schedule data transmitter 208 transmits the generated schedule data, and the public telephone booth transmits the image information based on the schedule data. Play it.

According to another embodiment of the present invention, the image transmitter 202 may transmit image information by a broadcasting method, and image information broadcast in a public telephone booth may be displayed in real time. In this case, the schedule data may not be provided to the public telephone booth.

The text transmitter 204 transmits text information among the additional information. Text information may also be transmitted based on schedule data for each group. In the public telephone booth, image information and text information may be displayed separately, and image information and text information may be merged and displayed in one image.

The statistical information management unit 212 functions to manage terminal usage information and exposed advertisement information in a public telephone booth. The data communication apparatus of the public telephone booth transmits usage information of the VoIP terminal or advertisement information exposed when the VoIP terminal is used to the central control server, and the statistical information manager 212 receives and manages such information. Such information can be provided to advertisers and can serve as an important basis for selecting advertising fees.

3 is a block diagram showing the configuration of a data communication apparatus provided in a public telephone booth according to an embodiment of the present invention.

Referring to FIG. 3, a data communication apparatus according to an embodiment of the present invention includes a data receiver 300, a data storage unit 302, a camera image receiver 304, an image data converter 306, and a controller 308. And a schedule data storage 310.

3 illustrates a configuration of a data communication apparatus when receiving schedule data provided from a central control server and reproducing a received image and text based on the schedule data. The configuration of the data communication apparatus is a data transmission method and data. It will be apparent to those skilled in the art that the present invention can be changed depending on the form of.

The data receiver 300 receives additional information including image information and text information from a central control server through a communication network.

The data storage unit 302 stores additional information received by the data receiving unit 300. According to an embodiment of the present invention, the information received by the data receiving unit may be stored using a network attached storage (NAS) or a network direc attached system (NDAS) of TCP / IP. The NDAS storage method is a method of directly connecting a hard disk to a network, which is effective in speed and cost.

The camera image receiving unit 304 receives image information photographed by a camera provided in a public telephone booth when a public telephone user uses a camera. In addition, when the call counterpart of the public telephone user transmits the video information by the camera, the camera video receiver also receives the camera video information of the call counterpart.

The image information stored in the data storage unit 302 and the image information received by the camera image receiving unit 304 are provided to the image data converting unit 306, and the image data converting unit converts the image data into a displayable form. do. The image data converter includes decoders for various image formats, and decodes the image data by using a decoder corresponding to the image data format stored in the data storage unit 302 or the image data format received from the camera image receiver. Solve and convert to original data. For example, when the video information is compressed by the MPEG method, the video data converter 306 restores the compression by the MPEG decoder. The video data converted by the video data converter is displayed on a display device provided in the public telephone booth.

The schedule data storage unit 310 stores schedule data received from the central control server through a communication network.

The controller 308 functions to control the overall operation of the data communication device. The controller 308 controls the data reception and storage operation of the data receiver 300, and the image data converter converts the image data based on the schedule data stored in the schedule data storage 310 to be displayed on the display device.

4 is a diagram illustrating a configuration of a public telephone booth in accordance with an embodiment of the present invention.

Referring to FIG. 4, a public telephone booth according to an embodiment of the present invention includes a VoIP terminal 400, a display device 402, a camera 404, a mobile phone charger 406, and a mailbox 408.

The VoIP terminal 400 may be installed in front of a public telephone booth corresponding to the general keys of users. The public telephone terminal 400 has a keypad through which users can enter telephone numbers and other commands.

The camera 404 is installed on the upper part of the public telephone booth and photographs the inside of the public telephone booth. The focus or iris may be controlled to obtain an optimal image from the camera, and a module may be provided to determine the position of the face portion of the user and control the pen tilt.

 According to an embodiment of the present invention, the camera 404 may be activated when the user requests the use of the camera to photograph the user who uses the VoIP terminal. According to another embodiment of the present invention, the camera 404 may be continuously activated to monitor the situation inside the public telephone booth. At this time, the camera continuously photographs the inside of the public telephone booth and stores the photographed information. Of course, a shock sensor or the like may be activated when the camera monitors the damage.

The display device 402 is preferably installed inside the user's field of view when the user looks at the camera. For example, the display device 402 may be installed below the camera at a predetermined distance from the camera. The position of the display device in this way is to maximize the display effect of the additional information by allowing the user's eyes to naturally stay on the display device when the user makes a video call while looking at the camera.

9 is a diagram illustrating a screen configuration of a display device according to an embodiment of the present invention.

Referring to FIG. 9, a screen of a display device according to an embodiment of the present invention is bent by the image display unit 900 and the text display unit 902. The image display unit 900 displays image data of additional information, and the text display unit 902 displays text data of additional information.

According to an embodiment of the present invention, the image information and the text information may be displayed by separate display screens. For example, image information may be displayed by an LCD screen and text information may be displayed by an LED screen. Of course, image information and text information may be displayed by dividing an area on one LCD screen or LED screen.

As illustrated in FIG. 9, when a user using a VoIP terminal uses a camera or a call counterpart uses a camera, camera captured images of the user and the call counterpart are preferably displayed together in a predetermined area of the display device screen. .

The cellular phone charger 406 and mailbox 408 can be installed at appropriate locations within the public phone booth and serve as a convenience facility to charge the mobile phone while making a call or to address necessary mail delivery within the public phone booth.

5 is a diagram illustrating an Internet phone system to which a VoIP terminal of the present invention is coupled.

Referring to FIG. 5, an Internet phone system to which a VoIP terminal is coupled includes a VoIP terminal 500, an originating VoIP gateway 502, a called VoIP gateway 504, and a called telephone terminal 506.

The signaling message or voice message transmitted from the VoIP terminal 500 is transmitted to the calling VoIP gateway 502 through a router (not shown). The VoIP gateway interprets the signaling message and sends the signaling message and voice message to the destination VoIP gateway 504.

The calling VoIP gateway 502 and the called VoIP gateway 504 perform signaling procedures such as establishing a call channel between an initial caller and a called party.

The destination gateway 504 determines whether the called party number corresponds to a PSTN network, an IP network, or a mobile communication network, and transmits a signaling message and a voice message to a terminal connected to the corresponding network.

5 shows a system in which a call is made between a VoIP terminal and a telephone terminal 506 connected to a PSTN network. In this case, the destination gateway 504 performs a function of converting a protocol into a protocol corresponding to the PSTN network. do.

6 is a flowchart illustrating a process of providing additional information to a plurality of public telephone booths in a central control server according to an embodiment of the present invention.

Referring to FIG. 6, the central control server receives and stores additional information such as image information and text information from the outside (step 600). As described above, additional information may be directly received and stored by being connected to a server of an external operator through a communication network, and an administrator may store additional information through an administrator computer.

In addition, the central control server generates schedule data for each group based on the stored additional information (step 602).

Once the schedule data is generated, it is monitored whether it is time to update additional information (step 604).

If the update time for a specific group, extract the address information of the public telephone booth belonging to the group. The address information here includes an IP address and a port number (step 606).

When the address information of the public telephone booth to be updated is extracted, the schedule data and the image / text information included in the schedule data are transmitted to the corresponding address (step 608).

7 is a flowchart illustrating a process of providing additional information to a plurality of public telephone booths in a central control server according to another embodiment of the present invention.

7 is a flowchart illustrating a case where additional information is provided to public telephone booths from a central control server by a broadcasting method.

Referring to FIG. 7, the central control server receives and stores additional information such as image information and text information from the outside (step 700).

The central control server generates schedule data for each group based on the stored additional information (step 702).

Once the schedule data is generated, the central control server creates a broadcasting channel for each group (step 704).

Once the broadcasting channel is created, the central control server broadcasts the video / text data to the broadcasting channel, and the public telephone booth belonging to each group receives the video / text from the broadcasting channel and displays it in real time (step 706). ).

8 is a flowchart illustrating a process of displaying additional information in a public telephone booth according to an embodiment of the present invention.

Referring to FIG. 8, the data communication apparatus of the public telephone booth receives additional information including image information and text information from the central control server (step 800).

The received image and text are displayed on the display device in the public telephone booth based on the schedule data provided from the central control server (step 802).

When the user requests to use the camera (step 804), the image data captured by the camera is decoded and displayed on the preset area of the display device screen (step 806).

When the camera image information is transmitted from the call counterpart as well as the user who uses the call (step 808), the camera image information of the other party is decoded and displayed on a preset area of the display device screen (step 808).

When the call is terminated, information on the call history of the user and advertisements exposed during the call is transmitted to the central control server (step 812).

1 is a diagram showing the configuration of a public telephone system using VoIP according to an embodiment of the present invention.

2 is a block diagram illustrating a module configuration of a central control server according to an embodiment of the present invention.

3 is a block diagram showing the configuration of a data communication apparatus provided in a public telephone booth according to an embodiment of the present invention.

Figure 4 is a diagram showing the configuration inside the public telephone booth according to an embodiment of the present invention.

5 is a diagram illustrating an Internet phone system in which a VoIP terminal of the present invention is coupled;

6 is a flowchart illustrating a process of providing additional information to a plurality of public telephone booths in a central control server according to an embodiment of the present invention.

7 is a flowchart illustrating a process of providing additional information to a plurality of public telephone booths in a central control server according to another embodiment of the present invention.

8 is a flowchart illustrating a process of displaying additional information in a public telephone booth according to an embodiment of the present invention.

9 illustrates a screen configuration of a display device according to an embodiment of the present invention.

Claims (17)

A plurality of public telephone booths having a VoIP terminal and a data communication device installed therein and installed in various places in combination with a communication network; A central control server coupled to the plurality of public telephone booths and a communication network, for providing additional information to the public telephone booth, Each of the plurality of public telephone booths is provided with a display device, and displays additional information provided from the central control server through the display device. Through the VoIP terminal to provide a call service by the VoIP method, The public telephone booths are grouped into a plurality of groups according to local characteristics and user characteristics to be used, the central control server provides additional information and additional information schedule data corresponding to the characteristics of each group, and the public telephone booth is the schedule. And displaying additional information provided from the central control server based on the data. The method of claim 1, Each of the plurality of public telephone booths further includes a camera for capturing a user and supporting a video call on the captured image. The method of claim 2, The display device is a public telephone system using VoIP, characterized in that located in the field of view of the user looking at the camera. The method of claim 1, The additional information includes a public telephone system using VoIP, characterized in that the advertising information, news information, public information including public information. delete delete The method of claim 1, The central control server generates additional information schedule data corresponding to each group, and broadcasts the additional information for each group through a communication network based on the schedule data. The method of claim 1, The additional information includes image information and text information, and the display apparatus displays the image information and text information independently. The method of claim 8, The display apparatus includes an LCD screen and an LED screen, wherein the video information is displayed on the lower surface of the LCD, and the text information is displayed on the LED screen. The method of claim 1, And the additional information includes advertisement information, and the VoIP terminal operates free of charge without requiring user billing. The method of claim 2, And a video photographed by the camera and a camera photographed image of a call counterpart are displayed on the display device together with the additional information. The method of claim 2, The camera is a public telephone system using VoIP, characterized in that by continuously shooting the inside of the public telephone booth to monitor the damage inside the equipment. The method of claim 1, The data communication device of the public telephone booth transmits the usage history of the VoIP terminal and additional information exposed during the call to the central control server. A public telephone service method in a VoIP public telephone system having a central control server, a VoIP terminal and a data communication device, and comprising a plurality of public telephone booths connected to the central control server through a communication network. (A) storing additional information data in the central control server; Generating schedule data of a reproduction order of the additional information at the central control server; (C) transmitting the additional information data from the central control server to the public telephone booth, The display apparatus provided in the public telephone booth reproduces and displays the additional information based on the schedule data, and the public telephone booth is grouped into a plurality of groups according to a local characteristic and a user characteristic to be used. Providing additional information and additional information schedule data corresponding to the characteristics of each group, wherein the public telephone booth displays the additional information provided from the central control server based on the schedule data. Public telephone service method. delete The method of claim 14, The additional information includes video information and text information, and the display apparatus displays the video information and text information independently. The method of claim 16, The display apparatus includes an LCD screen and an LED screen, wherein the image information is displayed on the lower surface of the LCD, and the text information is displayed on the LED screen.

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