KR20010078637A - Internet service system and method therefor - Google Patents

Abstract

PURPOSE: An Internet service system and method is provided to enable a user to easily operate a home page of the user's own in a client, to offer a local domain name for a short and easy IP address, to enable the user to offer a stable web service under a firewall environment, and offer a document synchronization service applicable to a remote education or conference by sharing web contents with others. CONSTITUTION: The system comprises a server(100) and a client(200). The server(100) includes a user management database(110), a user data server(120), and a notification server(130). The user management database(110) stores user personal data and PC data matched with individual IP address. The user data server(120) stores a local domain name matched with an individual IP address, and dynamically processes a mapping of the user data, the PC data and the local domain name in response to a request of the IP address by the client(200). The client(200) includes a local web server(210), a shell extension module(220), a file system database(230), a web browser(240), and a URL handler(250). The local web server performs a server function by transmitting an approval ID and a password to the user data server(110) and receiving the local domain name form the server(100). The shell extension module(220) helps manage directories corresponding to the approval ID, and the file system database(230) stores web contents for the local web server(210). The URL handler(250) analyzes a protocol of the local domain name in the case that the local domain name is input in an address input window of the web browser.

Description

Internet service system and its method {INTERNET SERVICE SYSTEM AND METHOD THEREFOR}

The present invention relates to an Internet service system and a method thereof, and more particularly, a local domain name whenever a client side, which has been given an IP address for general Internet access, accesses a server side that gives a simple IP address. The present invention relates to an Internet service system and a method for providing a web service even under a firewall or a dynamic IP environment.

In general, in the conventional Internet service system, each user PC connected to the network operates a web site by registering his or her web content with an IP address for general Internet access granted to the server.

In particular, web-based distance education or conferences put the data on the web server, and the client side who wants to open the material has a burden to pass through the Internet Service Provider (ISP). It is difficult to access and use.

In addition, conventionally, when an individual wants to operate his own homepage, it is difficult to physically and economically operate a server. Therefore, the homepage is operated through a method such as having a account on a specific server or web hosting. In other words, it had to go through an ISP, its Uniform Resource Locator (URL) was long and complex, and it was not easy to manage because the web content was on the ISP's server.

In addition, the Internet environment of the average individual user is very diverse, but the conventional web system has a disadvantage that it is not possible to perform a web service in a firewall or a dynamic IP environment.

Summary of the Invention The present invention has been made in an effort to solve such a conventional problem, and an object of the present invention is to provide a short and easy IP address while allowing an individual to easily operate their homepage on their PC. It provides a grant system and a web service method using the same.

It is another object of the present invention to provide a web hosting system and method thereof under a firewall environment that enables stable web service in any environment.

It is still another object of the present invention to provide a document synchronization system and method which can be easily applied to distance education or teleconference by sharing web content to be shared with other users on their PC.

1 is a view for explaining a local domain name assignment system according to an embodiment of the present invention.

2 is a flowchart illustrating a method for assigning a local domain name according to an embodiment of the present invention.

3 is a diagram illustrating a web hosting system in a firewall environment according to another embodiment of the present invention.

4A to 4B are diagrams for explaining a client / server communication model and a peer-to-peer communication model, respectively.

5 is a flowchart illustrating a web hosting method in a firewall environment according to another embodiment of the present invention.

6 is a view for explaining a document synchronization system according to another embodiment of the present invention.

7 is a flowchart illustrating an electronic document synchronization according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100, 600, 700: server unit 110, 620, 720: user information DB

120, 710, 610: user information server 130, 630: notification server

200, 400, 500, 800: Client part

210, 410, 510, 850, 870: local web server

220, 420, 520, 840: shell extension 230, 430, 530, 860: file system DB

240, 450, 540, 820: Web browser 250, 460, 550, 830: URL handler

300: firewall 440: reflect server

810: Electronic document synchronizer 812: Electronic document viewing window

814: text chat window 816: voice / video window

Local domain naming system according to one aspect for realizing the above object of the present invention,

A server unit dynamically receiving a user ID and a password from a user who has received an IP address for general Internet access via a network, and dynamically assigning a local domain name, and registering the same; And

It is installed on each user PC that has been given an IP address for general Internet access, and provides a user ID and password every time the server accesses the server via a network, and dynamically receives a local domain name from the server. It includes one or more client portions to perform an operation.

According to another aspect of the present invention, a web service method of a dynamic IP environment using a local domain naming system receives a user ID and a password from a user who is assigned an IP address for general Internet access. It is installed in the server unit that registers the local domain name and the user's PC which is given an IP address for general Internet access, and performs a predetermined server operation by receiving a local domain name every time the server unit is accessed via a network. In the web service method using a local domain naming system including at least one client unit,

(a) authenticating a first client unit, which is a service provider of a dynamic IP environment, converting the client-side IP address into a local domain name and registering the server unit;

(b) receiving a corresponding local domain name from the server unit as a second client unit, which is a service requester, inputs an ID of a service provider; And

(c) providing the content to the second client unit by the first client unit as the second client unit receives the corresponding local domain name.

In addition, a web hosting system in a firewall environment according to one feature for realizing another object of the present invention described above,

firewall;

At least one client unit receiving authentication information including user ID information and a password, thereby receiving a local domain name, and providing a corresponding web page in response to a request of a web page according to the local domain name; And

(1) When authentication information is inputted from the first client unit via the firewall, the authentication information is stored, the local domain name is assigned to the first client unit, and web hosting is requested from the first client unit. Check the local domain name of the first client unit and provide the requested IP address to the first client unit;

(2) When authentication information is input from the second client unit via the firewall, the authentication information is stored, the local domain name is provided to the second client unit, and web hosting is requested from the second client unit. And a server unit for checking a local domain name of the second client unit and providing the requested IP address to the second client unit.

In addition, a web hosting method in a firewall environment according to another aspect for realizing the above object of the present invention is to provide a local domain name to a service requester, a service provider, and each of the service requester and the service provider under a firewall environment. In the method for providing a local web service using a user information server to grant and register,

(a) when the service provider is authenticated to provide a local web service, the user information server checking whether there is a firewall and registering a client-side IP address;

(b) As the local domain name including the ID information is input by the service requester, the IP address of the web service is fetched using the ID information, the web service request is notified, and the reflecting server of the service requester is received. Granting and accessing;

(c) In step (b), the web service request notification is registered in the user information server as the web service request is notified from the service requester, and the service provider periodically receives the registered web service request notification to the server side. Connecting to the reflect server; And

(d) the reflecting server on the server side forwarding the packet to the client side as the local web server of the service provider provides the corresponding content.

In addition, a document synchronization system according to one feature for realizing another object of the present invention described above,

A server unit dynamically receiving a user ID and a password from a user who has received an IP address for general Internet access via a network, and dynamically assigning a local domain name, and registering the same; And

By providing a user ID and password to the server unit via a network, a local domain name is given, and in response to a request for data including an electronic document according to the local domain name, the corresponding data is provided to the requesting side. It includes one or more client portions that include a local web server.

In addition, the document synchronization method according to another feature for realizing another object of the present invention described above,

(a) compressing a required electronic document in a state in which a server unit and at least one client unit are connected to deliver the compressed content to at least one counterpart client unit;

(b) checking whether the format of the electronic document supports a Document Object Model (DOM);

(c) transmitting the cursor position when the format of the electronic document supports the document object model (DOM) in step (b), and using the document object model (DOM), determining and transmitting the scroll position; And

(d) in step (b), if the format of the electronic document does not support the document object model (DOM), transmitting the cursor position, and identifying and transmitting the scroll position by using a hooking or subclassing technique. It includes.

According to such an Internet service system and its method, it is possible to provide a short and easy IP address while making it easier for an individual to operate their homepage on their PC.

In addition, any environment such as firewall environment or dynamic IP environment can reliably provide web service, and it is easy to apply to remote education or teleconference by easily sharing web content to be shared with other users. Can be synchronized.

Then, embodiments will be described so that those skilled in the art can easily implement the present invention.

1 is a view for explaining a local domain name assignment system according to an embodiment of the present invention.

As shown in FIG. 1, the local domain naming system according to the embodiment of the present invention provides a local domain name from the server unit whenever the server unit 100 and the server unit side which dynamically assign and register the local domain name are accessed. It includes a client unit 200 is given.

The server unit 100 includes a user information DB 110, a user information server 120, and a notification server 130, receives a user ID and a password from the client unit 200, registers a local domain name, and registers the registration. The provided local domain name to the client unit 200.

In more detail, the user information DB 110 stores information including a user's image and a PC for each IP address for general Internet access of the client unit 200, and is easier and more concise than an IP address for general Internet access. The local domain name is stored, and the user information server 120 dynamically maps the user's personal and PC information and the local domain name in association with an IP address request of the client.

In addition, the notification server 130 provides the registered IP address information when another client accesses the information in which the IP address of the client changes.

The client unit 200 includes a local web server 210, a shell extension unit 220, a file system DB 230, a web browser 240, and a URL handler 250. Each time the server unit 100 is accessed via the server unit 100, a local domain name is given to perform a predetermined server operation.

The network specified in the present invention is used as a term that includes not only the concept of LAN, WAN, etc. but also the Internet backbone network.

The local web server 210 receives a local domain name from the server unit 100 by providing an authentication ID and a password to the user information server 110 of the server unit 100 via a network, and performs a predetermined server operation. In particular, it provides the corresponding web content according to the authentication ID.

The shell extension 220 helps manage the corresponding directory according to the authentication ID, and the file system DB 230 stores the web content of the local web server 210, wherein the stored web content is the user information server 110. Different content is provided by applying the ID or group-specific characteristics logged in to.

The web browser 240 includes an address bar for inputting a general domain name for accessing the general Internet and a local domain name for accessing a local web server. The web browser 240 searches for a web page on the general Internet according to each domain name entered in the address bar. Search for the data of the local web server provided under the dynamic IP environment and display it on the client unit 200.

When the local domain name is input to the address bar of the web browser, the URL handler 250 interprets the protocol of the local domain name and provides it to the server unit 100 via a network.

Then, according to the present invention, the service method according to the local domain name assignment will be described separately from the service provider and the service requester.

2 is a flowchart illustrating a method for assigning a local domain name according to an embodiment of the present invention.

As shown in Fig. 1 and Fig. 2, first, the service provider of the dynamic IP environment undergoes a predetermined authentication procedure (step S110), assigns a local domain name to the client side, and sets the local domain name to the user information DB ( 120) (step S120). Here, since the provision of the local domain name is performed every time the service provider accesses the server side, the IP address fluctuates on the server side even if the same client side is always accessed. Of course, the information on the client unit for each dynamic IP granted to each access is checked through the notification server 130 whenever the other client unit accesses.

In addition, if the service requester enters see: <ID> in the address bar of the web browser (step S130), the service handler's URL handler 250 obtains the corresponding IP address from the user information server 110 (step S140). The local web server 210 of the service provider then provides the web content to the service requester side (step S150).

As described above, according to the local domain naming system and method according to an embodiment of the present invention, when an individual user wants to operate his / her homepage, it can be operated even without going through an ISP, and another user can The URL that needs to be entered to access the homepage can also be shortened, and the advantage is that web content can be run directly on the PC.

3 is a diagram illustrating a web hosting system in a firewall environment according to another embodiment of the present invention.

As shown in FIG. 3, a web hosting system in a firewall environment according to another embodiment of the present invention may include a firewall 300, one or more first client units 400 located outside the firewall, and one or more located inside the firewall. The second client unit 500 and the server unit 600 is included.

The firewall 300 blocks the client unit accessing the server unit 600 to supplement the data stored in the server unit 600.

The first client 400 located outside the firewall 300 and controlled by the firewall includes a local web server 410, a shell extension 420, a file system DB 430, a reflect server 440, and a web. Including the browser 450 and the URL handler 460, the authentication information including the user ID information and password is input to receive the local domain name according to the request, and the web page request from the service requester according to the local domain name is In that case, provide that web page.

More specifically, the shell extension 420 is used to more easily manage the file system DB 430, which is a space in which the web content of the local web server 410 is stored, so that the user can view his web content at a glance. You can identify and manage your location.

The reflect server 440 is located between the local web server 410 and the web browser 450 to transfer information between service requesters and providers under a firewall environment.

In addition, since the web browser 450 and the URL handler 460 perform operations of the web browser 240 and the URL handler 250 mentioned in FIG.

The second client unit 500 located inside the firewall includes a user ID including a local web server 510, a shell extension 520, a file system DB 530, a web browser 540, and a URL handler 550. By inputting authentication information including information and password, a local domain name is provided accordingly, and a corresponding web page is provided upon request of a web page according to the local domain name. Here, since the operation of each component disclosed in the second client unit 500 is similar to the content mentioned in the first client unit 400, the description thereof will be omitted.

The server unit 600 includes a user information server 610, a user information DB 620, and a notification server 630, and when authentication information is input from the first client unit 400 via the firewall 300. After storing this in the local domain name is provided to the first client unit 400, when the web hosting is requested from the first client unit 400 has been given the local domain name local of the first client unit 400 The domain name is checked and the requested IP address is provided to the first client unit 400.

In addition, the server unit 600 stores the authentication information when the authentication information is input from the second client unit 500 located inside the firewall, and provides the local domain name to the second client unit 500, and provides the local domain name. When web hosting is requested from the second client 500, the local domain name of the second client 500 is checked and the requested IP address is provided to the second client 500.

As described above, the reflection server 440 of the first client unit 400 operating in the firewall environment serves to transfer data between users. In the embodiment of the present invention, Although described, it is also located in the server side that provides a web hosting service.

In other words, when located at the server side as shown in FIG. 4A, it operates as a client / server communication model, and when it is located at the client as shown in FIG. 4B, it operates as a peer to peer communication model.

The advantage of this hybrid communication model is that it uses peer-to-peer communication as much as possible and operates as a client / server communication model only when it is inevitable, such as a firewall, thereby reducing the bandwidth requirements of the web hosting service.

If the web service side is in a firewall environment, it operates as shown in FIG.

5 is a flowchart illustrating a web hosting method in a firewall environment according to another embodiment of the present invention.

As shown in FIG. 5, first, in order for a service provider under a firewall environment to provide a service, an authentication procedure and a user information server automatically detect a firewall (step S210), and then register a client IP address with the user information server (step S210). S215). Here, whether the user is a firewall user or not is determined as a result of the user information server attempting to access the client during the authentication process of the client. When the user is identified as a user in the firewall, the contents are recorded in the user information server, and when the other user wants to access the web service of the user in the firewall, the access method is different.

In addition, when a service requester who is another user wants to access a web service in the firewall, if a local domain name such as see: <ID> is entered in the address bar of the web browser (step S220), the URL handler displays the ID information after 'see:'. Obtain the IP address of the web service and whether the firewall from the user information server using (step S225). This makes Web services possible with local domain names. However, since the firewall user cannot access from the outside, the client registers a notification that the user information server requests the web service (step S230), and the client, which is the service requester, makes a session with the reflecting server on the service side and waits. (Step S240). The notification here also contains information about this session.

Subsequently, the user information server notified of the web service request according to step S230 registers the notification of the web service request (step S235), and accordingly, the local web server of the service provider receives the notification of the web service request on a regular basis ( Step S245). So even firewall users get notifications from the user information server on a regular basis, so they can figure out the web service needs of other users.

After step S245 or after step S240, the user information server connects to the corresponding session of the reflecting server on the service side (step S250).

If the local web server of the service provider provides the corresponding content to the user information server after step S250 (step S255), the reflect server on the user information server side forwards the packet (step S260). From this point on, the Reflect Server delivers data between the two terminals so that the Web service can be made as if the two terminals were directly connected.

6 is a view for explaining a document synchronization system according to another embodiment of the present invention.

As shown in FIG. 6, the document synchronization system according to another exemplary embodiment of the present invention receives a local domain name from the server unit 700 and the server unit 700 which dynamically assigns and registers an IP address, and receives another client. It includes a client unit 800 for sharing the document when the request for sharing the electronic document from the unit.

The server 700 includes a user information server 710 and a user information DB 720 to register a user ID and an IP address.

In more detail, the user information DB 720 stores a user's ID, password, and other personal information, stores a local domain name matched thereto, and is a middle tier user who handles information stored in the user information DB 720. The information server 710 enables client authentication processing, client information management, and querying user's personal information.

The client unit 800 includes an electronic document synchronizer 810, a web browser 820, a URL handler 830, a shell extension 840, a local web server 850, a file system DB 860, and a reflect server. 870, and receives a local domain name from the server unit 700 via a network to perform a server operation.

In more detail, the electronic document synchronizer 810 is installed on the client side, including sub-modules of the electronic document viewing window 812, the text chatting window 814, and the voice / video window 816, and sharing the electronic document. Enable meetings and training through At this time, the electronic document viewing window 812 is a module that shows the same document as the counterpart in the same scroll position, the text chat window 814 is a module for a simple text chat, the voice / video window 816 has the effect of training / meeting It is a module that delivers and displays voice and moving images for maximization.

The URL handler 830 works with the user information server 710 to process the user ID and the IP address, and the local web server 850 works with the user information server 710 to construct a default page, and the electronic document In conjunction with the base 810 forms a compressed HTTP protocol.

Although the local web server 850 running on the client side is compliant with HTTP / 1.1 in terms of its function, the local web server 850 may provide a web service in a firewall or a dynamic IP environment by interworking with the reflect server 870. In order to share the document of the counterpart through the web browser 820, the communication is performed by distinguishing whether it is a firewall environment or a general environment.

Synchronization data of electronic documents is also transferred to the same logic regardless of firewall and dynamic IP. Synchronization of electronic documents requires the recognition of the host's behavior (cursor movement, scroll position, whiteboarding, etc.) to be communicated through the reflect server.

Next, the synchronization procedure of the electronic document will be described.

7 is a flowchart illustrating an electronic document synchronization according to another embodiment of the present invention.

Referring to FIG. 7, first, it is checked whether a service provider and a service requester are connected (step S310), and when the provider and the requestor are connected, the content of the electronic document is compressed (step S320), and the compressed content is converted into a local web by HTTP. The server transmits the data to at least one counterpart client through the server (step S330).

Then, it is checked whether the format of the electronic document supports a Document Object Model (DOM) (step S340). At this time, the way of recognizing the behavior of the host depends on whether the format of the electronic document supports the DOM. Generally, the DOM is an application programming interface (API) for electronic documents. Means the way. In this way, the DOM models elements defined in structural documents such as SGML, XML, HTML, words, power pointers, etc. as a single object and tree ( It is expressed in the logical form of the tree structure.

Using this DOM, programmers can create documents, navigate their structure, and add, modify, or delete elements and content. Objects found within electronic documents can be accessed, changed, deleted, or added using the DOM, and further richer features can be defined by adding interfaces that provide extended functionality in the future.

In the case of the electronic document supporting the DOM in step S340, the cursor position is transmitted (step S350), and the scroll position detection and various settings of the DOM are detected in a normal manner and transmitted to the client (step S360).

In addition, in the case of the electronic document that does not support the DOM in step S340 (step S370), the behavior of the host is detected by using a hooking or subclassing technique.

In any case, the sensed behavior of the host PC, which is the subject of the meeting or training, is made in the form of a packet and passed to the clients, and each client module can play the same effect as if they were gathered together.

In addition, when a client requests a web service, it also sends its own ID information, so that the user knows who accesses the web service. Therefore, the web service provider can provide different web contents by ID or group.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

As described above, according to the present invention

Even in a PC with a dynamic IP environment or a firewall environment, a web service can be provided to an external client.

Users can easily configure and operate their homepage on their PCs, and other users can easily access them by simply using their own ID as their IP address, even if they do not use complicated IP addresses or domain names.

In addition, you can conduct meetings or training while viewing commonly used electronic documents at the same time with other users through the network. In particular, other users can share the current scroll position of the electronic document and the cursor position of the meeting side. . Since there is no need to convert to HTML in particular, there is no fear of deterioration of the document, and the authoring is simple.

Claims (17)

A server unit dynamically receiving a user ID and a password from a user who has received an IP address for general Internet access via a network, and dynamically assigning a local domain name, and registering the same; And It is installed on each user PC that has been given an IP address for general Internet access, and provides a user ID and password every time the server accesses the server via a network, and dynamically receives a local domain name from the server. Local domain naming system comprising one or more client portions to perform an operation. The method of claim 1, wherein the server unit, A user information DB for storing information including a user's identity and a PC for each IP address for general Internet access of the client unit, and storing a local domain name corresponding thereto; A user information server for dynamically mapping a local domain name with information including the user's image and PC in response to a request of the client unit; And And a notification server for notifying the other client unit of the local domain name assigned to the client unit. The method of claim 1, wherein the client unit, A local web server configured to dynamically provide a local domain name from the server unit by providing an authentication ID and a password to the server unit through a network and perform a predetermined server operation; A web browser including an address bar for inputting a general IP address for accessing the Internet or a local domain name for accessing a local web server; And And a URL handler for interpreting a protocol of a local domain name inputted into the address bar of the web browser and providing the server unit to the server via the network. The method of claim 3, wherein the local web server unit, A local web server providing corresponding web content according to the authentication ID; A shell extension unit to help manage a corresponding directory according to the authentication ID; And And a file system DB for storing web content of the local web server. The method of claim 4, wherein the web content provided by the local web server, Local domain name assignment system, characterized in that different content by applying the characteristics of each ID or group logged in the server unit. It is installed in the server unit that receives a user ID and password from a user who is assigned an IP address for general internet access and registers a local domain name, and the user PC that is assigned an IP address for general internet access. A web service method using a local domain naming system including at least one client unit configured to receive a local domain name each time an access unit is performed and to perform a predetermined server operation. (a) authenticating a first client unit, which is a service provider of a dynamic IP environment, converting the client-side IP address into a local domain name and registering the server unit; (b) receiving a corresponding local domain name from the server unit as a second client unit, which is a service requester, inputs an ID of a service provider; And (c) providing the content by the first client unit to the second client unit as the second client unit receives the corresponding local domain name. firewall; At least one client unit receiving authentication information including user ID information and a password, thereby receiving a local domain name, and providing a corresponding web page in response to a request of a web page according to the local domain name; And (1) When authentication information is inputted from the first client unit via the firewall, the authentication information is stored, the local domain name is assigned to the first client unit, and web hosting is requested from the first client unit. Check the local domain name of the first client unit and provide the requested IP address to the first client unit; (2) When authentication information is input from the second client unit via the firewall, the authentication information is stored, the local domain name is provided to the second client unit, and web hosting is requested from the second client unit. And a server unit which checks a local domain name of the second client unit and provides the requested IP address to the second client unit. 8. The firewall of claim 7, further comprising a reflecting server located at either the server unit or the client unit to deliver web service contents in the firewall to a first client unit outside the firewall. Web hosting system. 8. The web hosting system of claim 7, wherein the reflecting server operates as a client / server communication environment when the reflecting server is located at a service providing side. 8. The web hosting system of claim 7, wherein the reflecting server operates in a peer-to-peer communication environment when the reflecting server is located on the user PC side. A method for providing a local web service using a service requester, a service provider, and a user information server for assigning and registering a local domain name to each of the service requester and the service provider under a firewall environment, (a) when the service provider is authenticated to provide a local web service, the user information server checking whether there is a firewall and registering a client-side IP address; (b) As the local domain name including the ID information is input by the service requester, the IP address of the web service is fetched using the ID information, the web service request is notified, and the reflecting server of the service requester is received. Granting and accessing; (c) In step (b), the web service request notification is registered in the user information server as the web service request is notified from the service requester, and the service provider periodically receives the registered web service request notification to the server side. Connecting to the reflect server; And (d) a method of forwarding a packet to a client side by a reflecting server on the server side as the local web server of the service provider provides the corresponding content. A server unit dynamically receiving a user ID and a password from a user who has received an IP address for general Internet access via a network, and dynamically assigning a local domain name, and registering the same; And By providing a user ID and password to the server unit via a network, a local domain name is given, and in response to a request for data including an electronic document according to the local domain name, the corresponding data is provided to the requesting side. And at least one client portion comprising a local web server. The method of claim 12, wherein the server unit, A user information DB for storing personal information of a user and information including a PC for each IP address for general Internet access of the client unit, and storing a local domain name corresponding thereto; And And a user information server for dynamically mapping user information, user PCs, and domain names in response to a request of the client unit. The method of claim 12, wherein the client unit, An electronic document synchronization unit for synchronizing the electronic document between the networked client units; A web browser including an address bar for inputting a general URL for general Internet access and a local domain name for local web server access; A URL handler for interpreting a protocol of a local domain name input to the address bar of the web browser; Shell extension to help manage the directory according to the authentication ID; A local web server installed in a user PC and providing a corresponding web page according to an authentication ID; A file system DB for storing web content of the local web server; And And a reflecting server for transmitting contents and synchronization information of the electronic document to the outside. The electronic document synchronization unit of claim 14, Text chat window; Voice and video chat windows; And To share document files including HTML documents, word processor files, presentation files, etc., to share the document itself with network terminal users through HTTP protocol, and to share scroll position, host cursor position and white boarding, etc. And a document viewing window. (a) compressing a required electronic document in a state in which a server unit and at least one client unit are connected to deliver the compressed content to at least one counterpart client unit; (b) checking whether the format of the electronic document supports a Document Object Model (DOM); (c) transmitting the cursor position when the format of the electronic document supports the document object model (DOM) in step (b), and identifying and transmitting the scroll position using the document object model (DOM); And (d) in step (b), if the format of the electronic document does not support the document object model (DOM), transmitting the cursor position, and identifying and transmitting the scroll position by using a hooking or subclassing technique. Document synchronization method comprising a. 17. The method of claim 16, wherein the compressed content of step (a) is delivered in HTTP protocol.