Patent Publication Number: US-9432364-B2

Title: System and method for providing a service to end terminal that uses authentication information of another mobile communication terminal, service server, mobile communication terminal, end terminal, and storage medium

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a Divisional Application of U.S. Ser. No. 13/133,881 filed on Jun. 9, 2011, which claims priority to Korean Patent Application No. 10-2008-0126343 filed on Dec. 12, 2008, the disclosures of which are incorporated in their entirety by reference herein. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a system, a method, a service server, a mobile communication terminal, an end-point terminal, and a storage medium, for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal, and more specifically to a technique for providing a service, in which an end-point terminal can use the service although authentication information of the end-point terminal is not authentication information of a currently connected mobile communication terminal. 
     BACKGROUND ART 
     With the advancement of information communication technologies, a variety of end-point terminals capable of playing back documents, images and moving pictures (hereinafter, ‘documents, images and moving pictures’ will be simply referred to as ‘contents’ for the convenience of explanation, unless otherwise specified), such as MPeg audio layer-3 (MP3) players, Personal Multimedia Players (PMP) and Ultra Mobile Personal Computers (UMPC), are widely used. A user downloads desired contents from personal computers (PC) and plays back the downloaded contents. However, there is a problem in that the user cannot download desired contents when the user is moving or cannot connect to a PC. 
     In order to solve the problem, proposed are techniques for adding a communication means connectible to a short-range communication network onto an end-point terminal, such as a Bluetooth or an ultra-wideband (UWB), and connecting the end-point terminal to a mobile communication terminal through the short-range communication network. According to the techniques, a user can be provided with a desired service through an end-point terminal and a mobile communication terminal of the user. 
     On the other hand, there are some cases incapable of using the mobile communication terminal of the user due to a breakdown of the terminal, discharge of a battery, or the like. In this case, the user should wait until the mobile communication terminal normally operates or should be provided with the service through a mobile communication terminal of another user. At this point, if a fee is charged for using the service, the user should make a reasonable agreement with another user on the fee charged on the mobile communication terminal of another user, and thus the techniques cannot be easily applied in these cases. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a technique for providing a service, in which although an end-point terminal user is provided with the service through a mobile communication terminal of another user, a service fee or the like is charged on a mobile communication terminal of the user, and thus the user can easily use the service without making an agreement on the service fee or the like. 
     Technical Solution 
     To accomplish the above object, according to an embodiment of the present invention, there is provided a system for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal, the system comprising: the end-point terminal connected to a first mobile communication terminal and a second mobile communication terminal through a short-range communication network and connected to a service server via the second mobile communication terminal, for using the service by using authentication information of the first mobile communication terminal; the second mobile communication terminal connected to the end-point terminal through the short-range communication network and connected to the service server through a mobile communication network, and connecting the end-point terminal that uses the authentication information of the first mobile communication terminal to the service server; and the service server connected to the first and second mobile communication terminals through the mobile communication network, for authenticating the end-point terminal that uses the authentication information of the first mobile communication terminal to use the service through the second mobile communication terminal. 
     In the embodiment, the service server may authenticate the end-point terminal to use the service only when authentication options selected by the end-point terminal and the second mobile communication terminal match. 
     In the embodiment, the authentication option may include information on whether a service fee will be charged only on the first mobile communication terminal or on both of the first and second mobile communication terminals. 
     In the embodiment, the service providing system may further comprise a billing server connected to the service server through the mobile communication network or a wired communication network, for performing a billing process on the first mobile communication terminal or the second mobile communication terminal depending on the authentication option, when the end-point terminal is provided with the service. 
     According to another embodiment of the present invention, there is provided a method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal, performed by a system in which an end-point terminal is connected to first and second mobile communication terminals through a short-range communication network, the first and second mobile communication terminals are connected to a service server through a mobile communication network, and the service server is connected to a billing server through a wired communication network, the method comprising the steps of: connecting to the service server via the first mobile communication terminal, by the end-point terminal; requesting the service server to transmit authentication information of the first mobile communication terminal, by the end-point terminal; receiving an authentication information transmission permission signal from the first mobile communication terminal and transmitting the authentication information of the first mobile communication terminal to the end-point terminal, by the service server; connecting to the service server via the second mobile communication terminal and transmitting the authentication information of the first mobile communication terminal, by the end-point terminal; confirming whether or not authentication options selected by the end-point terminal and the second mobile communication terminal match, by the service server; and providing the end-point terminal with the service, by the service server, if the authentication options selected by the end-point terminal and the second mobile communication terminal match. 
     In the embodiment, the authentication option may include information on whether a service fee will be charged only on the first mobile communication terminal or on both of the first and second mobile communication terminals. 
     In the embodiment, the service providing method may further comprise the step of: performing a billing process on the first or second mobile communication terminal depending on the authentication option, by the billing server, after the service server provides the service. 
     According to still another embodiment of the present invention, there is provided a service server for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal, the server comprising: a communication unit for transmitting and receiving data through a mobile communication network; a mobile communication terminal management unit for managing information on first and second mobile communication terminals received through the communication unit; an end-point terminal management unit for managing information on the end-point terminal received through the communication unit; a short-range communication network management unit for managing information on a short-range communication network that relays communications between the first mobile communication terminal and the end-point terminal and between the second mobile communication terminal and the end-point terminal; a storage unit for storing the information on the first and second mobile communication terminals, on the end-point terminal, and on the short-range communication network, and authentication information of the first mobile communication terminal provided to the end-point terminal; and a control unit for controlling operation of each constitutional component, controlling the communication unit to provide the authentication information of the first mobile communication terminal in response to a request from the end-point terminal, and authenticating the end-point terminal to use the service when the end-point terminal connected through the second mobile communication terminal provides the authentication information of the first mobile communication terminal. 
     In the embodiment, the control unit may authenticate the end-point terminal to use the service only when authentication options selected by the end-point terminal and the second mobile communication terminal match. 
     According to still another embodiment of the present invention, there is provided a method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal by a service server, the method comprising the steps of: receiving a request for authentication information of a first mobile communication terminal from the end-point terminal; providing the end-point terminal with the authentication information of the first mobile communication terminal depending on permission of the first mobile communication terminal; receiving a connection request of the end-point terminal having the authentication information of the first mobile communication terminal via the second mobile communication terminal; confirming whether or not authentication options selected by the end-point terminal and the second mobile communication terminal match; and providing the end-point terminal with the service, if the authentication options match. 
     According to still another embodiment of the present invention, there is provided a storage medium for storing the method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal by a service server, as a program. 
     According to still another embodiment of the present invention, there is provided a mobile communication terminal permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal, the mobile communication terminal comprising: a first communication unit for transmitting and receiving data through a mobile communication network; a second communication unit for transmitting and receiving data through a short-range communication network; an end-point terminal management unit for managing information on the end-point terminal; a storage unit for storing authentication information of the mobile communication terminal; and a control unit for controlling operation of each constitutional component, selecting an authentication option for the end-point terminal connected through the short-range communication network, and permitting connection of the end-point terminal to the service server if the selected authentication option matches an authentication option selected by the end-point terminal. 
     According to still another embodiment of the present invention, there is provided a method for permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal by a mobile communication terminal, the method comprising the steps of: connecting the end-point terminal having the authentication information of another mobile communication terminal to the mobile communication terminal; transferring the authentication information to a service server, selecting an authentication option for the end-point terminal, and confirming whether or not the selected authentication option matches an authentication option selected by the end-point terminal; and relaying connections between the end-point terminal and the service server, if the authentication option selected for the end-point terminal matches the authentication option selected by the end-point terminal. 
     According to still another embodiment of the present invention, there is provided a storage medium for storing the method for permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal by a mobile communication terminal, as a program. 
     According to still another embodiment of the present invention, there is provided an end-point terminal for using a service by using authentication information of another mobile communication terminal, the end-point terminal comprising: a communication unit for transmitting and receiving data through a short-range communication network; an input unit for receiving a user command; a playback unit for playing back service contents received from a service server; a storage unit for storing authentication information of first and second mobile communication terminals received from the service server; and a control unit for controlling operation of each constitutional component and controlling the communication unit to receive the authentication information of the first mobile communication terminal from the service server in response to a user command inputted through the input unit, transmit the authentication information of the first mobile communication terminal to the second mobile communication terminal if the second mobile communication terminal is connected, and transmit an authentication option inputted through the input unit to the second mobile communication terminal. 
     According to still another embodiment of the present invention, there is provided a method for using a service by using authentication information of another mobile communication terminal by an end-point terminal, the method comprising the steps of: requesting authentication information of a first mobile communication terminal from a service server; receiving and storing the authentication information from the service server; selecting an authentication option; and using the service depending on authentication of the service server. 
     According to still another embodiment of the present invention, there is provided a storage medium for storing the method for using a service by using authentication information of another mobile communication terminal by an end-point terminal, as a program. 
     Advantageous Effects 
     The present invention is effective in that although a user uses a service through the second mobile communication terminal of another person, a service fee can be charged on the first mobile communication terminal of the user. Therefore, the user does not need to make an agreement with another person on the service fee, and thus the end-point terminal can easily use the service from the service server via the second mobile communication terminal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram showing a service providing system according to an embodiment of the present invention. 
         FIG. 2  is a flowchart illustrating a service providing method according to an embodiment of the present invention. 
         FIG. 3  is a block diagram showing a service server according to an embodiment of the present invention. 
         FIG. 4  is a flowchart illustrating a method for providing a service by a service server according to an embodiment of the present invention. 
         FIG. 5  is a block diagram showing a mobile communication terminal according to an embodiment of the present invention. 
         FIG. 6  is a flowchart illustrating a method for permitting connection of an end-point terminal by a mobile communication terminal according to an embodiment of the present invention. 
         FIG. 7  is a block diagram showing an end-point terminal according to an embodiment of the present invention. 
         FIG. 8  is a flowchart illustrating a method for using a service by an end-point terminal according to an embodiment of the present invention. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     The preferred embodiments of the present invention will be hereafter described in detail, with reference to the accompanying drawings. 
     The present invention may, however, be embodied in different forms and should not be constructed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. Throughout the disclosure, like reference numerals refer to like parts throughout the various figures and embodiments of the present invention. The drawings are not necessarily to scale and in some instances, proportions may have been exaggerated in order to clearly illustrate features of the embodiments. 
     First, a service providing system for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal according to an embodiment of the invention will be described with reference to  FIG. 1 . 
       FIG. 1  is a block diagram showing a service providing system according to an embodiment of the present invention. 
     As shown in  FIG. 1 , a service providing system  100  for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal according to the embodiment (hereinafter, ‘a service providing system for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal’ will be simply referred to as ‘a service providing system’ for the convenience of explanation, unless otherwise specified) is configured to connect a service server  110 , an application server  120 , and a billing server  130  through a wired communication network  101  and/or a mobile communication network  102 , to connect the service server  110  to first and second mobile communication terminals  140  and  142  through the mobile communication network  102 , and to connect the first or second mobile communication terminal  140  or  142  to an end-point terminal  150  through a short-range communication network  103 . The short-range communication networks used in this system can be a wireless LAN, a Bluetooth, a UWB, or the like. In addition, the application server  120  and/or the billing server  130  can be included in the service server  110  as a constitutional component. 
     The end-point terminal  150  is connected to the service server  110  via the second mobile communication terminal  142  and uses a service by using authentication information of the first mobile communication terminal  140  (← 110 ). 
     The first mobile communication terminal  140  allows the end-point terminal  150  to use the authentication information. 
     The second mobile communication terminal  142  connects the end-point terminal  150  that uses the authentication information of the first mobile communication terminal  140  to the service server  110 . Here, although it is shown that the first and second mobile communication terminals  140  and  142  and the end-point terminal  150  are connected through the same short-range communication network  103 , the present invention does not need to be particularly restricted thereto, and it should be noted that the terminals can be connected through short-range communication networks  103  different from one another. That is, if the end-point terminal moves to another place after connecting to the first mobile communication terminal through a short-range communication network, the end-point terminal can be connected to the second mobile communication terminal through another short-range communication network. Accordingly, it is notable that the connection between the end-point terminal and the second mobile communication terminal may be different from the connection between the end-point terminal and the first mobile communication terminal in time and space. 
     The service server  110  authenticates the end-point terminal  150  that uses the authentication information of the first mobile communication terminal  140  to use the service through the second mobile communication terminal  142 . In addition, the service server  110  provides a service desired to be used by the end-point terminal  150 . It is notable that the service can be provided by the application server  120  in some cases. The service server  110  preferably authenticates the end-point terminal  150  to use the service only when authentication options selected by the end-point terminal  150  and the second mobile communication terminal  142  match. Here, the authentication option includes information on whether a service fee will be charged only on the first mobile communication terminal or on both of the first and second mobile communication terminals. If the authentication options do not match, the service cannot be provided. 
     The application server  120  stores services, contents, and the like used by the end-point terminal  150 . 
     If the end-point terminal  150  is provided with the service, the billing server  130  performs a billing process on the first mobile communication terminal  140  and/or the second mobile communication terminal  142  depending on the authentication option. 
     Hereinafter, a method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal according to an embodiment of the invention will be described with reference to  FIG. 2 . 
       FIG. 2  is a flowchart illustrating a service providing method according to an embodiment of the present invention. 
     As shown in  FIG. 2 , a method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal according to the embodiment (hereinafter, ‘a method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal’ will be simply referred to as ‘a service providing method’ for the convenience of explanation, unless otherwise specified) can be applied to a system in which the end-point terminal is connected to first and second mobile communication terminals through a short-range communication network, the first and second mobile communication terminals are connected to a service server through a mobile communication network, and the service server is connected to a billing server through a wired communication network. 
     As a first step, the end-point terminal is connected to the service server via the first mobile communication terminal S 100 . When the end-point terminal is connected to the service server, the service server receives and stores information on the end-point terminal, information on the first mobile communication terminal, information on the short-range communication network, login information, and the like. 
     As a second step, the end-point terminal requests the service server to transmit authentication information of the first mobile communication terminal S 110 . 
     As a third step, the service server receives an authentication information transmission permission signal from the first mobile communication terminal and transmits the authentication information of the first mobile communication terminal to the end-point terminal S 120 . If the authentication information is transmitted, the service server records that the first mobile communication terminal permits transmission of the authentication information. The permission record is needed to prove validity of billing when a billing process is performed. The authentication information may include a USIM code, a user code, or the like. 
     As a fourth step, the end-point terminal connects to the service server via the second mobile communication terminal and transmits the authentication information of the first mobile communication terminal S 130 . 
     As a fifth step, the service server confirms whether or not authentication options selected by the end-point terminal and the second mobile communication terminal match S 140 . The authentication option used at this point preferably includes information on whether a service fee will be charged only on the first mobile communication terminal or on both of the first and second mobile communication terminals. 
     As a sixth step, if the authentication options selected by the end-point terminal and the second mobile communication terminal match, the service server provides the end-point terminal with the service S 150 . After performing the sixth step, the service providing method may further include the step of performing a billing process on the first mobile communication terminal and/or the second mobile communication terminal depending on the authentication option, by the billing server. 
     Hereinafter, a service server for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal according to an embodiment of the invention will be described with reference to  FIG. 3 . 
       FIG. 3  is a block diagram showing a service server according to an embodiment of the present invention. 
     As shown in  FIG. 3 , in a service server  110  for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal according to the embodiment (hereinafter, ‘a service server for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal’ will be simply referred to as ‘a service server’ for the convenience of explanation, unless otherwise specified), a communication unit  111  transmits and receives data through a mobile communication network. 
     A mobile communication terminal management unit  112  manages information on first and second mobile communication terminals received through the communication unit  111 . 
     An end-point terminal management unit  113  manages information on the end-point terminal received through the communication unit  111 . 
     A short-range communication network management unit  114  manages information on a short-range communication network that relays communications between the first and second mobile communication terminals and the end-point terminal. 
     A storage unit  116  stores the information on the first and second mobile communication terminals, on the end-point terminal, and on the short-range communication network, and authentication information of the first mobile communication terminal provided to the end-point terminal. 
     A control unit  115  controls operation of each constitutional component, controls the communication unit  111  to provide the authentication information of the first mobile communication terminal in response to a request from the end-point terminal, and authenticates the end-point terminal to use the service when the end-point terminal connected through the second mobile communication terminal provides the authentication information of the first mobile communication terminal. Here, the control unit  115  preferably authenticates the end-point terminal  150  to use the service only when authentication options selected by the end-point terminal and the second mobile communication terminal match. Since the authentication option includes important information on liability on a service fee, the authentication options should be matched to prevent dispute among users of the mobile communication terminals. However, if a service fee is not charged for using the service, the authentication options do not need to necessarily match. 
     Hereinafter, a method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal by a service server according to an embodiment of the invention will be described with reference to  FIG. 4 . 
       FIG. 4  is a flowchart illustrating a method for providing a service by a service server according to an embodiment of the present invention. 
     As shown in  FIG. 4 , in a method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal by a service server according to the embodiment (hereinafter, ‘a method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal by a service server’ will be simply referred to as ‘a service providing method by a service server’ for the convenience of explanation, unless otherwise specified), the service server receives a request for authentication information of a first mobile communication terminal from the end-point terminal S 200 , as a first step. 
     As a second step, the service server provides the end-point terminal with the authentication information of the first mobile communication terminal depending on permission of the first mobile communication terminal S 210 . If the authentication information is provided, the service server records that the authentication information has been provided, in the first mobile communication terminal information. 
     As a third step, the service server receives a connection request from the end-point terminal having the authentication information of the first mobile communication terminal via the second mobile communication terminal S 220 . 
     As a fourth step, the service server confirms whether or not authentication options selected by the end-point terminal and the second mobile communication terminal match S 230 . If the authentication options match, information on the authentication option is recorded in the second mobile communication terminal information. 
     As a fifth step, if the authentication options match, the service server provides the end-point terminal with the service S 240 . 
     On the other hand, the method for providing a service to an end-point terminal that uses authentication information of another mobile communication terminal by a service server is stored in a storage medium as a program. 
     Hereinafter, a mobile communication terminal permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal according to an embodiment of the invention will be described with reference to  FIG. 5 . 
       FIG. 5  is a block diagram showing a mobile communication terminal according to an embodiment of the present invention. 
     As shown in  FIG. 5 , in a mobile communication terminal  142  permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal according to the embodiment (hereinafter, ‘a mobile communication terminal permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal’ will be simply referred to as ‘a mobile communication terminal’ for the convenience of explanation, unless otherwise specified), a first communication unit  143  transmits and receives data through a mobile communication network. 
     A second communication unit  144  transmits and receives data through a short-range communication network. In order to accept various types of short-range communication networks, the second communication unit  144  can accommodate two or more short-range communication specifications. 
     An end-point terminal management unit  145  manages information on the end-point terminal. 
     A control unit  146  controls operation of each constitutional component, selects an authentication option for the end-point terminal connected through the short-range communication network, and permits connection of the end-point terminal to a service server if the selected authentication option matches an authentication option selected by the end-point terminal. 
     A storage unit  147  stores authentication information of the mobile communication terminal. The authentication information stored in the storage unit  147  can be provided to the service server and the end-point terminal. 
     Hereinafter, a method for permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal by a mobile communication terminal according to an embodiment of the invention will be described with reference to  FIG. 6 . 
       FIG. 6  is a flowchart illustrating a method for permitting connection of an end-point terminal by a mobile communication terminal according to an embodiment of the present invention. 
     As shown in  FIG. 6 , in a method for permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal by a mobile communication terminal according to the embodiment (hereinafter, ‘a method for permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal by a mobile communication terminal’ will be simply referred to as ‘a connection permitting method by a mobile communication terminal’ for the convenience of explanation, unless otherwise specified), the end-point terminal having the authentication information of another mobile communication terminal is connected to the mobile communication terminal S 300 , as a first step. 
     As a second step, the mobile communication terminal transfers the authentication information to the service server, selects an authentication option for the end-point terminal, and confirms whether or not the selected authentication option matches an authentication option selected by the end-point terminal S 310 . 
     As a third step, if the authentication option selected for the end-point terminal matches the authentication option selected by the end-point terminal, the mobile communication terminal relays connections between the end-point terminal and the service server S 320 . 
     On the other hand, the method for permitting connection of an end-point terminal that uses authentication information of another mobile communication terminal by a mobile communication terminal is stored in a storage medium as a program. 
     Hereinafter, an end-point terminal for using a service by using authentication information of another mobile communication terminal according to an embodiment of the invention will be described with reference to  FIG. 7 . 
       FIG. 7  is a block diagram showing an end-point terminal according to an embodiment of the present invention. 
     As shown in  FIG. 7 , in an end-point terminal  150  for using a service by using authentication information of another mobile communication terminal according to the embodiment (hereinafter, ‘an end-point terminal for using a service by using authentication information of another mobile communication terminal’ will be simply referred to as ‘an end-point terminal’ for the convenience of explanation, unless otherwise specified), a communication unit  151  transmits and receives data through a short-range communication network. 
     An input unit  152  receives a user command. Input means such as a switch, a keypad, a keyboard, a touch screen and the like can be used as the input unit  152 . 
     A playback unit  153  plays back service contents received from a service server. 
     A storage unit  155  stores authentication information of a first mobile communication terminal and/or a second mobile communication terminal received from the service server. 
     A control unit  174  controls operation of each constitutional component and controls the communication unit  151  to receive the authentication information of the first mobile communication terminal from the service server in response to a user command inputted through the input unit  152 , transmit the authentication information of the first mobile communication terminal to the second mobile communication terminal if the second mobile communication terminal is connected, and transmit an authentication option inputted through the input unit  152  to the second mobile communication terminal. 
     Hereinafter, a method for using a service by using authentication information of another mobile communication terminal by an end-point terminal according to an embodiment of the invention will be described with reference to  FIG. 8 . 
       FIG. 8  is a flowchart illustrating a method for using a service by an end-point terminal according to an embodiment of the present invention. 
     As shown in  FIG. 8 , in a method for using a service by using authentication information of another mobile communication terminal by an end-point terminal according to the embodiment (hereinafter, ‘a method for using a service by using authentication information of another mobile communication terminal by an end-point terminal’ will be simply referred to as ‘a method for using a service by an end-point terminal’ for the convenience of explanation, unless otherwise specified), the end-point terminal requests authentication information of a first mobile communication terminal from a service server S 400 , as a first step. 
     As a second step, the end-point terminal receives and stores the authentication information from the service server S 410 . 
     As a third step, the end-point terminal selects an authentication option S 420 . 
     As a fourth step, the end-point terminal uses the service depending on authentication of the service server S 430 . 
     On the other hand, the method for using a service by using authentication information of another mobile communication terminal by an end-point terminal is stored in a storage medium as a program. 
     Hereinafter, an example of applying the present invention is described. 
     As a first step, a user connects to the service server via the first mobile communication terminal using the end-point terminal. 
     As a second step, the user requests authentication information from the service server using the end-point terminal in order to cope with unavailability of the first mobile communication terminal. 
     As a third step, the service server examines whether or not the first mobile communication terminal permits providing the authentication information, and if the first mobile communication terminal permits providing the authentication information, the service server transmits the authentication information to the end-point terminal. 
     As a fourth step, if the first mobile communication terminal cannot operate normally due to a breakdown, discharge of a battery, or the like, the user searches for the second mobile communication terminal through a short-range communication network and connects to the service server via the second mobile communication terminal. 
     As a fifth step, the end-point terminal transmits authentication information of the first mobile communication terminal to the service server and selects an authentication option. 
     As a sixth step, the second mobile communication terminal selects an authentication option. 
     As a seventh step, the service server compares the authentication options selected by the end-point terminal and the second mobile communication terminal, and if the authentication options match, the service server permits using the service. 
     According to the present invention described above, although a user uses a service through the second mobile communication terminal of another person, a service fee can be charged on the first mobile communication terminal of the user. Therefore, the user does not need to make an agreement with another person on the service fee, and thus the end-point terminal can easily use the service received from the service server via the second mobile communication terminal. 
     Embodiments of the present invention have been described above with reference to the accompanying drawings. 
     While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention. 
     INDUSTRIAL APPLICABILITY 
     According to the present invention, although an end-point terminal has only authentication information of a first mobile communication terminal, the end-point terminal can connect to a service server and use a service.