Abstract:
A communication system includes a first terminal with first and second communication units and an information manager, and a second terminal with third and fourth communication units and an information storage unit. The first communication unit makes a wireless communication with a first base station according to a first protocol using information managed by the information manager. The fourth communication unit makes a wireless communication with the first terminal according to a third protocol and receives information used for a wireless communication with the second base station according to a second protocol.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2011-179169, filed on Aug. 18, 2011, the entire contents of which are incorporated herein by reference. 
       FIELD 
       [0002]    The embodiments discussed herein are related to a communication system for a mobile communication terminal and a base station, and to the mobile communication terminal. 
         [0003]    The mobile communication terminal may also be referred to as a mobile communication terminal equipment or a mobile communication terminal apparatus. 
       BACKGROUND 
       [0004]    Recent mobile communication terminals include smart phones and feature phones. Because of the relatively large casing and screen and the relatively large number layers in the hierarchical structure of application software, the smart phone may be difficult to manipulate when the smart phone is to be used as a telephone. On the other hand, the feature phone may be easy to manipulate when the feature phone is to be used as a telephone, however, it may be difficult to use a large number of application software in the feature phone as opposed to the smart phone. 
         [0005]    When a user wishes to use phones in two environments, namely, the smart phone that has the relatively large screen and variety of application software and the feature phone that is easy to use as a telephone, the user subscribes to a telecommunications carrier or network operator of each of the smart phone and the feature phone. In this case, two UIM (User Identify Module) cards are issued with respect to the smart phone and the feature phone, that is, the two mobile communication terminals. The UIM card is an IC (Integrated Circuit) card that is used in the 3G (3rd Generation mobile telecommunications), and records personal information such as a telephone number and a subscriber ID (Identifier). 
         [0006]    On the other hand, a part of the information may be safely duplicated from a SIM (Subscriber Identify Module) card, and a mobile equipment may send a request to the network operator&#39;s equipment to clone a subscriber identification information, IMSI (International Mobile Subscriber Identify), stored in the SIM card. The IMSI of the subscriber and an IMEI (International Mobile Equipment Identity) of the mobile equipment are authenticated by the network operator&#39;s equipment, in order to generate an IMSI clone. The data stored in the SIM card may be recorded in a storage of the mobile equipment. An example of such a technique is proposed in a Japanese Laid-Open Patent Publication No. 2006-50554. 
         [0007]    In addition, a communication terminal may include a storage to store information that forms a basis of a use authorization, and the number of communication terminals sharing the information that forms the basis of the use authorization. The communication terminal may communicate with the other communication terminals sharing the information, judge whether the communication terminal is in a totally shared state in which a communication is possible with all of the other communication terminals sharing the information, and set the communication terminal to a use startable state. When the use of the communication terminal is actually started based on an input made by the user&#39;s operation, a use start notification is sent to the other communication terminals sharing the information. The communication terminal that receives the use start notification erases the apparent existence of the information that forms the basis of the use authorization, in order to disable the use of the communication terminal based on the information that forms the basis of the use authorization. An example of such a technique is proposed in a Japanese Laid-Open Patent Publication No. 2007-306169. 
         [0008]    Further, a cordless handset of a cordless telephone (or portable telephone) may perform a near field communication using a SIM card substitute with a base station provided with the SIM card, and store SIM information recorded in the SIM card. The cordless handset may communicate with a mobile equipment in order to use the mobile phone service, and output the stored SIM information to the mobile equipment upon request. An example of such a technique is proposed in a Japanese Laid-Open Patent Publication No. 2010-50848. 
         [0009]    If the UIM cards are compatible with the smart phone and the feature phone and UIM lock-free, a single UIM card may be used for the smart phone and the feature phone. However, the use of the single UIM card on the smart phone and the feature phone may involve a troublesome operation of extracting the UIM card from one phone and inserting the UIM card into the other phone. This operation may be time consuming, and may be difficult to perform while the user is moving. Furthermore, the simultaneous use of the smart phone and the feature phone to make communications is impossible using the single UIM card. 
         [0010]    According to the techniques proposed in the Japanese Laid-Open Patent Publications No. 2006-50554, No. 2007-306169, and No. 2010-50848 described above, it is impossible to set, to a mobile communication terminal not having the UIM card, only one of the plurality of communication protocols usable by the mobile communication terminals having the UIM card. In addition, when the mobile communication terminal having the UIM card uses a first communication protocol and the mobile communication terminal not having the UIM card uses a second communication protocol different from the first communication protocol, these two communication terminals are unable to simultaneously make separate communications. 
       SUMMARY 
       [0011]    Accordingly, it is an object in one aspect of the embodiment to provide a communication system and a mobile communication terminal that may use the information of one mobile communication terminal and simultaneously enable communications in a plurality of mobile communication terminals using different communication protocols. 
         [0012]    According to one aspect of the present invention, a communication system may include a first mobile communication terminal including a first communication unit configured to make a wireless communication with a first base station according to a first protocol and to make a wireless communication with a second base station according to a second protocol, an information manager configured to manage information used for the wireless communication according to one of the first and second protocols, and a second communication unit configured to send information used for a wireless communication with the second base station according to the second protocol to another mobile communication terminal according to a third protocol; and a second mobile communication terminal including a third communication unit, a fourth communication unit configured to make a wireless communication with the first mobile communication terminal according to the third protocol and configured to receive the information used for a wireless communication with the second base station according to the second protocol, and an information storage unit configured to store the information received by the fourth communication unit, wherein the first mobile communication terminal makes the wireless communication with the first base station, according to the first protocol, by the first communication unit using the information managed by the information manager, and wherein the second mobile communication terminal makes a wireless communication with the second base station, according to the second protocol, by the third communication unit using the information stored in the information storage unit. 
         [0013]    The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims. 
         [0014]    It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0015]      FIG. 1  is a diagram illustrating a structure of a main mobile communication terminal in an embodiment; 
           [0016]      FIG. 2  is a diagram illustrating a structure of a sub mobile communication terminal in an embodiment; 
           [0017]      FIG. 3  is a diagram for explaining a first state; 
           [0018]      FIG. 4  is a diagram for explaining a second state; 
           [0019]      FIG. 5  is a diagram illustrating a control sequence when starting the mobile communication terminal; 
           [0020]      FIG. 6  is a diagram illustrating the control sequence when starting the mobile communication terminal; 
           [0021]      FIG. 7  is a diagram illustrating the control sequence when starting the mobile communication terminal; 
           [0022]      FIG. 8  is a diagram for explaining a control sequence when requesting delivery of UIM information; and 
           [0023]      FIG. 9  is a diagram for explaining a control sequence when using a UIM card from the sub mobile communication terminal. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0024]    Preferred embodiments of the present invention will be described with reference to the accompanying drawings. 
         [0025]    According to one aspect of the embodiment, two mobile communication terminals, namely, a main mobile communication terminal and a sub mobile communication terminal, may be used. For example, the main mobile communication terminal may be formed by a feature phone, and the sub mobile communication terminal may be formed by a smart phone. Of course, by taking into consideration how frequent each phone may be used and the like, the main mobile communication terminal may be formed by the smart phone, and the sub mobile communication terminal may be formed by the feature phone. 
         [0026]    A description will now be given of the communication system and the mobile communication terminal in each embodiment according to the present invention. 
         [0027]    &lt;Structure of Main Mobile Communication Terminal&gt; 
         [0028]      FIG. 1  is a diagram illustrating a structure of the main mobile communication terminal in an embodiment. A main mobile communication terminal  10  illustrated in  FIG. 1  includes a wireless communication unit  11 , a UIM unit  12 , a storage unit  13 , a processing unit (or computing unit)  14 , a display unit  15 , an audio unit  16 , an input device  17 , a BT (Bluetooth, registered trademark) unit  18 , and an infrared communication unit  19  that are connected via a bus  20 . 
         [0029]    The wireless communication unit  11  may make a wireless communication with a base station (not illustrated) using two wireless protocols. For example, the two wireless protocols may be CDMA1× (Code Division Multiple Access 1×) for audio communication, and EV-DO (Evolution Data Only (Optimized)) for data communication. The wireless communication unit  11  may modulate a transmitting signal supplied from the processing unit  14  or the audio unit  16 , and send the modulated signal to the base station via an antenna  501 . In addition, the wireless communication unit  11  may demodulate a reception signal received via the antenna  501 , and supply the demodulated signal to the processing unit  14  or the audio unit  16 . 
         [0030]    A UIM card may be loaded into the UIM unit  12 . The UIM card may be formed by an IC card, and manage UIM information for use in a wireless communication between the main mobile communication terminal  10  and a base station (not illustrated). For example, the UIM information includes information used by the CDMA1× protocol and the EV-DO protocol. In other words, the UIM card may store, with respect to each of the CDMA1× protocol and the EV-DO protocol, first UIM information that may be physically copied and used, such as subscriber information, a telephone number of the main mobile communication terminal  10 , a SMS (Short Message Service), accumulated charge of calls, and the like. In addition, second UIM information, used by the CDMA1× protocol and the EV-DO protocol, may be generated when an operation is performed using an authenticating function (application software) within the UIM card, the UIM card itself is accessed, and the like. In the following description, the first UIM information and the second UIM information may be generally referred to as UIM information. 
         [0031]    The processing unit  14  may execute various processing programs stored in the storage unit  13 . The various processing programs, when executed by the processing unit  14 , may perform a control process with respect to parts within the main mobile communication terminal  10 , a coding process on a transmitting signal, a decoding process on the reception signal, and the like. In addition, the storage unit  13  may store UIM delivery information to be described later, indicating main mobile communication terminal  10  or a sub mobile communication terminal  30  that uses the CDMA1× protocol and the EV-DO protocol. 
         [0032]    The display unit  15  may display various character information and image information such as a screen, under the control of the processing unit  14 . The audio unit  16  may digitize an analog audio signal output from a microphone (not illustrated) that picks up sound, and supply the digital audio signal to the wireless communication unit  11  or the processing unit  14 . In addition, the audio unit  16  may convert a digital audio signal supplied from the wireless communication unit  11  or the processing unit  14  into an analog signal, and supply the analog audio signal to a speaker (not illustrated) that produces sound. It is assumed for the sake of convenience in  FIG. 1  that the microphone and the speaker are included in the audio unit  16 . 
         [0033]    The input device  17  may include various keys that are manipulated by the user when inputting a telephone number, a character, and the like. The various keys may include a ten-key, a call key, a select key, a submit key, a clear key, and the like. The input made from the input device  17  is supplied to the processing unit  14 . 
         [0034]    The BT unit  18  may exchange data with a BT unit of the sub mobile communication terminal  30  or other mobile communication terminals, by a near field communication such as the Bluetooth (registered trademark). The infrared communication unit  19  may exchange data with an infrared communication unit of the sub mobile communication terminal  30  or other mobile communication terminals, by an infrared communication. 
         [0035]    &lt;Structure of Sub Mobile Communication Terminal&gt; 
         [0036]      FIG. 2  is a diagram illustrating a structure of the sub mobile communication terminal in an embodiment. The sub mobile communication unit  30  illustrated in  FIG. 2  includes a wireless communication unit  31 , a storage unit  33 , a processing unit (or computing unit)  34 , a display unit  35 , an audio unit  36 , an input device  37 , a BT unit  38 , and an infrared communication unit  39  that are connected via a bus  40 . The sub mobile communication terminal  30  includes no UIM unit. 
         [0037]    The wireless communication unit  31  may make a wireless communication with the base station using two wireless protocols. For example, the two wireless protocols may be CDMA1× for audio communication, and EV-DO for data communication. The wireless communication unit  31  may modulate a transmitting signal supplied from the processing unit  34  or the audio unit  36 , and send the modulated signal to the base station via an antenna  511 . In addition, the wireless communication unit  31  may demodulate a reception signal received via the antenna  511 , and supply the demodulated signal to the processing unit  34  or the audio unit  36 . 
         [0038]    The processing unit  34  may execute various processing programs stored in the storage unit  33 . The various processing programs, when executed by the processing unit  34 , may perform a control process with respect to parts within the sub mobile communication terminal  30 , a coding process on a transmitting signal, a decoding process on the reception signal, and the like. In addition, the storage unit  33  may store the first UIM information and the UIM delivery information supplied from the main mobile communication terminal  10 . 
         [0039]    The display unit  35  may display various character information and image information such as a screen, under the control of the processing unit  34 . The audio unit  36  may digitize an analog audio signal output from a microphone (not illustrated) that picks up sound, and supply the digital audio signal to the wireless communication unit  31  or the processing unit  34 . In addition, the audio unit  36  may convert a digital audio signal supplied from the wireless communication unit  31  or the processing unit  34  into an analog signal, and supply the analog audio signal to a speaker (not illustrated) that produces sound. It is assumed for the sake of convenience in  FIG. 1  that the microphone and the speaker are included in the audio unit  36 . 
         [0040]    The input device  37  may include various keys that are manipulated by the user when inputting a telephone number, a character, and the like. The various keys may include a ten-key, a call key, a select key, a submit key, a clear key, and the like. The input made from the input device  37  is supplied to the processing unit  34 . 
         [0041]    The BT unit  38  may exchange data with a BT unit of the main mobile communication terminal  10  or other mobile communication terminals, by a near field communication such as the Bluetooth. The infrared communication unit  39  may exchange data with an infrared communication unit of the main mobile communication terminal  10  or other mobile communication terminals, by an infrared communication. 
         [0042]    In this embodiment, the main mobile communication terminal  10  is physically loaded with the UIM card into the UIM unit  12 , and the sub mobile communication terminal  30  is not physically loaded with the UIM card. The sub mobile communication terminal  30  may temporarily use the UIM information in the UIM card of the main mobile communication terminal  10 , in order that the single UIM card may be used by the two mobile communication terminals  10  and  30 . 
         [0043]    The UIM information may be transmitted between the main and sub mobile communication terminals  10  and  30 , using the BT units  18  and  38 . Hence, the troublesome operation of loading and unloading the UIM card between the main and sub mobile communication terminals  10  and  30  may be avoided. Furthermore, the UIM information may be transmitted between the main and sub mobile communication terminals  10  and  30 , using the infrared communication units  19  and  39 , for example, instead of using the BT units  18  and  38 . 
         [0044]    The UIM information in the UIM card may be partially allocated to the main and sub mobile communication terminals  10  and  30 . Hence, the single UIM card may be used simultaneously by the main and sub mobile communication terminals  10  and  30 . In the case in which the UIM information of the CDMA1× protocol and the UIM information of the EV-DO protocol are stored in the UIM card, the UIM information of the CDMA1× protocol may be copied from the UIM card loaded into the UIM unit  12  of the main mobile communication terminal  10  to the storage unit  33  of the sub mobile communication terminal  30  using the BT units  18  and  38 . In this case, the main mobile communication terminal  10  may perform the wireless communication by the wireless communication unit  11  using the UIM information of the CDMA1× protocol, and the sub mobile communication terminal  30  may perform the wireless communication by the wireless communication unit  31  using UIM information of the EV-DO protocol. 
         [0045]    In addition, the UIM delivery information indicating the allocation state of the UIM information may be stored in the main and sub mobile communication terminals  10  and  30 . Each of the main and sub mobile communication terminals  10  and  30  may be provided with a function to turn the corresponding one of the wireless communication units  11  and  31  ON or OFF, according to the UIM delivery information. 
         [0046]      FIG. 3  is a diagram for explaining a first state. In the first state, the main mobile communication terminal  10  may perform the communication (audio) using the CDMA1× protocol and the communication (data) using the EV-DO protocol, and no wireless function may be provided the sub mobile communication terminal  30 . Normally, the wireless communication unit  11  of the main mobile communication terminal  10  uses the UIM information of the CDMA1× protocol and the UIM information of the EV-DO protocol in the UIM card that is loaded into the UIM unit  12 . Hence, the wireless communication unit  11  may perform the communication (audio) using the CDMA1× protocol as indicated by an arrow with a hatching, and the communication (data) using the EV-DO protocol as indicated by an arrow with a halftone dot meshing. The wireless communication unit  30  of the sub mobile communication terminal  30  has no UIM information of the CDMA1× protocol and no UIM information of the EV-DO protocol, and no wireless communication may be made by the wireless communication unit  31 . 
         [0047]      FIG. 4  is a diagram for explaining a second state. In the second state, the main mobile communication terminal  10  may perform the communication (audio) using the CDMA1× protocol, and the sub mobile communication terminal  30  may perform the communication (data) using the EV-DO protocol. As illustrated in  FIG. 4 , the UIM information of the EV-DO protocol in the UIM card that is loaded into the UIM unit  12  of the main mobile communication terminal  10  may be sent to the sub mobile communication terminal  30  by the BT units  18  and  38 , and stored in the storage unit  33 . 
         [0048]    The wireless communication unit  11  of the main mobile communication terminal  10  may use the UIM information of the CDMA1x protocol in the UIM card, and perform the communication using the CDMA1× protocol as indicated by an arrow with a hatching. In addition, the wireless communication unit  31  of the sub mobile communication terminal  30  may use the UIM information of the EV-DO protocol in the storage unit  33 , and perform the communication using the EV-DO protocol as indicated by an arrow with a halftone dot meshing. 
         [0049]    In this state, the wireless functions of the wireless communication units  11  and  31  may be controlled based on the UIM delivery information stored in the storage units  13  and  33 , respectively, in order to disable the communication function of the wireless communication unit  11  using the EV-DO protocol in the main mobile communication terminal  10 , and disable the communication function of the wireless communication unit  31  using the CDMA1× protocol in the sub mobile communication terminal  30 . 
         [0050]    On the other hand, a server (not illustrated) that is connected to the base station may perform a management to permit (or tolerate) access from two different systems, namely, the CDMA1× protocol system and the EV-DO protocol system, by the two mobile communication terminals  10  and  30  having identical UIM information. When these two conditions are satisfied, the two mobile communication terminals  10  and  30  may use the identical UIM information and simultaneously make access to the two systems, namely, the CDMA1× protocol system and the EV-DO protocol system. In addition, simultaneous access from the two mobile communication terminals  10  and  30  to one of the two systems, that is, the CDMA1× protocol system or the EV-DO protocol system, may be prevented. 
         [0051]    In this embodiment, the two systems are the CDMA1× protocol system and the EV-DO protocol system, however, an arbitrary combination of systems may be used and an arbitrary managing method may be employed, as long as the managing method employed by the server permits access from two systems by the two mobile communication terminals  10  and  30  having the identical UIM information. 
         [0052]    &lt;Start Sequence&gt; 
         [0053]      FIGS. 5 ,  6 , and  7  are diagrams illustrating a control sequence when starting the main mobile communication terminal  10 . In  FIGS. 5 through 7 , a wireless function  10 A denotes a function to control the wireless communication unit  11  by a task of the program running on the processing unit  14 , and a UIM function  10 B denotes a function to control the UIM unit  12  by a task of the program running on the processing unit  14 . A store function  10 C denotes a function to control the storage unit  13  by a task of the program running on the processing unit  14 , and a control function  10 D denotes a function to control delivery and the like of the UIM information by a task of the program running on the processing unit  14 . A BT function  10 E denotes a function to control the BT unit  18  by a task of the program running on the processing unit  14 . 
         [0054]    In addition, a wireless function  30 A denotes a function to control the wireless communication unit  31  by a task of the program running on the processing unit  34 , and a store function  30 C denotes a function to control the storage unit  33  by a task of the program running on the processing unit  34 . A control function  30 D denotes a function to control delivery and the like of the UIM information by a task of the program running on the processing unit  34 , and a BT function  30 E denotes a function to control the BT unit  38  by a task of the program running on the processing unit  34 . 
         [0055]    In  FIG. 5 , the control function  10 D may read the UIM delivery information of the main mobile communication terminal  10  from the storage function  10 C. In this example, the UIM delivery information (1×) of the CDMA1× protocol system is “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system is “no delivery (not-in-use)”, in the main mobile communication terminal  10 . 
         [0056]    Next, the control function  10 D may read the UIM delivery information from the store function  30 C of the sub mobile communication terminal  30 , via the BT functions  10 E and  30 E and the control function  30 D. The UIM delivery information (1×) of the CDMA1× protocol system is “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system is “no delivery (not-in-use)”, in the sub mobile communication terminal  30 . 
         [0057]    In other words, the UIM delivery information of the CDMA1x protocol system and the UIM delivery information of the EV-DO protocol system match in the main and sub mobile communication terminals  10  and  30 , and the control function  10 D may recognize that the UIM information is unused in the sub mobile communication terminal  30 . 
         [0058]    In  FIG. 6 , the control function  10 D may read the UIM delivery information of the main mobile communication terminal  10  from the store function  10 C. In this example, the UIM delivery information (1×) of the CDMA1× protocol system is “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system is “delivered (in-use)”, in the main mobile communication terminal  10 . 
         [0059]    Next, the control function  10 D may read the UIM delivery information from the store function  30 C of the sub mobile communication terminal  30 , via the BT functions  10 E and  30 E and the control function  30 D. The UIM delivery information (1×) of the CDMA1× protocol system is “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system is “delivered (in-use)”, in the sub mobile communication terminal  30 . 
         [0060]    In other words, the UIM delivery information of the CDMA1x protocol system and the UIM delivery information of the EV-DO protocol system match in the main and sub mobile communication terminals  10  and  30 , and the control function  10 D may recognize that the UIM information of the EV-DO protocol is in-use in the sub mobile communication terminal  30 . 
         [0061]    In  FIG. 7 , the control function  10 D may read the UIM delivery information of the main mobile communication terminal  10  from the store function  10 C. In this example, the UIM delivery information (1×) of the CDMA1× protocol system is “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system is “no delivery (not-in-use)”, in the main mobile communication terminal  10 . 
         [0062]    Next, the control function  10 D may read the UIM delivery information from the store function  30 C of the sub mobile communication terminal  30 , via the BT functions  10 E and  30 E and the control function  30 D. The UIM delivery information (1×) of the CDMA1× protocol system is “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system is “delivered (in-use)”, in the sub mobile communication terminal  30 . 
         [0063]    In other words, the UIM delivery information of the CDMA1x protocol system and the UIM delivery information of the EV-DO protocol system do not match in the main and sub mobile communication terminals  10  and  30 , and the control function  10 D may recognize that the UIM information of the EV-DO protocol is in-use in the sub mobile communication terminal  30 . For this reason, the control function  10 D may stop (or disable or turn OFF) the wireless function  10 A, and the control function  10 D may stop (or disable or turn OFF) the wireless function  30 A, via the BT functions  10 E and  30 E and the control function  30 D. 
         [0064]      FIGS. 5 through 7  illustrate the control sequence when starting the main mobile communication terminal  10 , however, a similar control sequence may be executed in the sub mobile communication terminal  30  when starting the sub mobile communication terminal  30 . 
         [0065]    &lt;UIM Information Delivery Request&gt; 
         [0066]      FIG. 8  is a diagram for explaining a control sequence when requesting delivery of the UIM information from the sub mobile communication terminal  30 . In  FIG. 8 , it is assumed that initially, the UIM delivery information (1×) of the CDMA1× protocol system is “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system is “no delivery (not-in-use)” in the store function  30 C of the sub mobile communication terminal  30 . 
         [0067]    The control function  30 D may send a request to use the wireless function of the EV-DO protocol with respect to the main mobile communication terminal  10 , in response to an input from the input device  37  or the like. This request to use the wireless function of the EV-DO reaches the control function  10 D, via the BT functions  30 E and  10 E. Hence, the control function  10 D may stop the wireless function of the EV-DO communication of wireless function  10 A (step S 11 ). In response to a wireless function stop notification, the control function  10 D may rewrite the UIM delivery information (1×) of the CDMA1× protocol system to “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system to “delivered (in-use)”, in the store function  10 C of the main mobile communication terminal  10  (step S 12 ). 
         [0068]    The control function  10 D may read the first UIM information of the CDMA1× protocol and the EV-DO protocol from the UIM function  10 B (step S 13 ). The first UIM information of the CDMA1× protocol and the EV-DO protocol may be supplied to the control function  30 D, via the BT functions  10 E and  30 E, and the control function  30 D may store the first UIM information of the CDMA1× protocol and the EV-DO protocol in the store function  30 C (step S 14 ). 
         [0069]    The control function  30 D may start the wireless function of the EV-DO communication of the wireless function  30 A (step S 15 ). In addition, the control function  30 D may rewrite the UIM delivery information (1×) of the CDMA1× protocol system to “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system to “delivered (in-use)”, in the store function  30 C of the sub mobile communication terminal  30  (step S 16 ). 
         [0070]      FIG. 8  illustrates the UIM delivery from the sub mobile communication terminal  30 , however, the UIM delivery from the main mobile communication terminal  10  may be performed by a control sequence similar to that illustrated in  FIG. 8 . Further, when sending a delivery cancel request for the UIM information from the sub mobile communication terminal  30 , the delivery of the UIM information may be cancelled in a manner similar to when the delivery of the UIM information is requested in  FIG. 8 . 
         [0071]      FIG. 9  is a diagram for explaining a control sequence when using the UIM card from the sub mobile communication terminal  30 . In  FIG. 9 , it is assumed that initially, the UIM delivery information (1×) of the CDMA1× protocol system is “no delivery (not-in-use)”, and the UIM delivery information (EV-DO) of the EV-DO protocol system is “delivered (in-use)” in the store function  30 C of the sub mobile communication terminal  30 . 
         [0072]    When the wireless function  30 A of the sub mobile communication terminal  30  is to use the UIM information of the EV-DO protocol, the wireless function  30 A may request generation of the second UIM information of the EV-DO protocol with respect to the control function  30 D (step S 21 ). The control function  30 D may confirm the UIM delivery information in the store function  30 C of the sub mobile communication terminal  30 . In this example, the UIM delivery information (EV-DO) of the EV-DO protocol is “delivered (in-use)”, and thus, the control function  30 D may request confirmation of the UIM delivery information to the control function  10 D of the main mobile communication terminal  10 , via the BT functions  30 E and  10 E. 
         [0073]    Accordingly, the control function  10 D may confirm the UIM delivery information of the main mobile communication terminal  10  to the store function  10 C (step S 22 ), and confirm that the UIM delivery information (EV-DO) of the EV-DO protocol is “delivered (in-use)”. Thereafter, the control function  10 D may request generation of the second UIM information of the EV-DO protocol with respect to the UIM function  10 B (step S 23 ). Hence, the control function  10 D may supply the second UIM information of the EV-DO protocol generated by the UIM function  10 B to the wireless function  30 A, via the BT functions  10 E and  30 E and the control function  30 D. 
         [0074]    On the other hand, the first UIM information of the EV-DO protocol, not requiring access to the UIM card itself, is already stored in the store function  30 C of the sub mobile communication terminal  30 . For this reason, when the wireless function  30 A requests reading of the first UIM information of the EV-DO protocol to the control function  30 D (step S 24 ), the control function  30 D may confirm the UIM delivery information in the store function  30 C. Because the UIM delivery information (EV-DO) in the store function  30 C is “delivered (in-use)”, the control function  30 D may read the first UIM information of the EV-DO protocol from the store function  30 C and supply this first UIM information to the wireless function  30 A. 
         [0075]    Accordingly, the wireless function  30  may use the first UIM information of the EV-DO protocol. By storing a part of the UIM card function (or first UIM information) in the sub mobile communication terminal  30 , the number of accesses made via the BT function  10 E of the main mobile communication terminal  10  and the BT function  30 E of the sub mobile communication terminal  30  may be reduced, and the current consumption may be reduced. 
         [0076]    In this state, in the main mobile communication terminal  10 , the wireless function  10 A of the CDMA1× protocol may also use the UIM function  10 B. Hence, the wireless function of the CDMA1× protocol may be used in the main mobile communication terminal  10  and the wireless function of the EV-DO protocol may be used in the sub mobile communication terminal  30 , using the single UIM card. 
         [0077]    In  FIG. 9 , the first UIM information and the second UIM information are illustrated separately depending on whether the calculation is performed by the application software of the UIM card. However, the first UIM information may include specific information to be updated in real-time by the application software running in the main and sub mobile communication terminals  10  and  30 . In this case, the specific information may be stored in the store function  30 C of the sub mobile communication terminal  30 , and at the same time, the specific information in the UIM function  10 B of the main mobile communication terminal  10  may be updated by a procedure similar to that for the second UIM information. The physical reading method of the UIM information may be set depending on the purpose of using the UIM information. 
         [0078]    The management using the UIM delivery information may be preferred in order to perform an exclusive operation that does not generate a mismatch of UIM information, such as the two mobile communication terminals  10  and  30  using the UIM information (for example, the UIM information of the EV-DO protocol) of the single UIM card. To prepare for a case in which the UIM delivery information is destroyed, the control function  10 D of the main mobile communication terminal  10  may periodically monitor the UIM delivery information of the sub mobile communication terminal  30  in order to reduce the risk of the exclusive operation. In this case, when an abnormal state is detected in which the mismatch occurs between the UIM delivery information of the sub mobile communication terminal  30  and the UIM delivery information of the main mobile communication terminal  10 , the control function  10 D may carry out a control to stop the use of the UIM information from the sub mobile communication terminal  30  and to the use the UIM information from the main mobile communication terminal  10 . 
         [0079]    In addition, in order to reduce the risk of the exclusive operation, the control function  10 D may manage the UIM delivery information by adding an expiry date (or expiry time) to the UIM delivery information, and notify the expiry date to the sub mobile communication terminal  30 . The expiry date indicates the time when the usable state (or usability) of the UIM information in the sub mobile communication terminal  30  expires. When the expiry date arrives (or is reached) in the sub mobile communication terminal  30 , the control function  30 D may automatically change the UIM delivery information from “delivered (in-use)” to “no delivery (not-in-use)”. At the same time, when the expiry date arrives in the main mobile communication terminal  10 , the control function  10 D may automatically change the UIM delivery information from “delivered (in-use)” to “no delivery (not-in-use)”. In this case, the state indicated by the UIM delivery information may be returned to the original state without making a communication between the main and sub mobile communication terminals  10  and  30 . The expiry date may be designated to 2 hours, 1 day, and the like, from a user interface such as the input device  17 . 
         [0080]    In this embodiment, the communication between the main and sub mobile communication terminals  10  and  30  is performed via the BT functions  10 E and  30 E. However, the communication between the main and sub mobile communication terminals  10  and  30  may be performed via a cable using connectors and the like, or by a wireless communication via a wireless LAN (Local Area Network) and the like. In addition, signals used to send the UIM information may be subjected to an enciphering process. 
         [0081]    According to this embodiment, two mobile communication terminals, namely, a smart phone that has the relatively large screen and variety of application software and a feature phone that is easy to use as a telephone, for example, may use a single UIM card when preferred. In addition, one of the two mobile communication terminals may perform an audio communication and the other of the two mobile communication terminals may perform a data communication, simultaneously, to improve the convenience to the user. 
         [0082]    In this embodiment, the manufacturer&#39;s serial number that is unique to the mobile communication terminal may be identical for the main mobile communication terminal  10  and the sub mobile communication terminal  30 , by regarding a combination of the main and sub mobile communication terminals  10  and  30  as a single terminal. When different serial numbers are assigned to the main and sub mobile communication terminals  10  and  30 , the two mobile communication terminals  10  and  30  having different serial numbers will make access using the same telephone number, and thus, the network operator may make modification to permit such an access. 
         [0083]    For example, the main mobile communication terminal  10  may be created according to specifications targeting mainly international standards, and the sub mobile communication terminal  30  may be created to utilize specialized or characteristic functions of a particular network operator. In this case, the main mobile communication terminals  10  may be created according to essentially the same specifications, and the development cost may be reduced. In addition, a user who owns different models of feature phones may simultaneously use a smart phone in addition to the feature phone. 
         [0084]    The allocation of the UIM information to the mobile communication terminals  10  and  30  is not limited to the wireless function, and may be applied to other functions such as a digital television (1 SEG (Japanese terrestrial digital broadcasting service for mobile devices)) and the like using the UIM information. 
         [0085]    Information limited to within the mobile communication terminal may be moved between the main and sub mobile communication terminals  10  and  30 . When the serial numbers of the main and sub mobile communication terminals  10  and  30  are different, another UIM card may be loaded to the sub mobile communication terminal  30  when the simultaneous full use of the functions of the main and sub mobile communication terminals  10  and  30  is preferred. In this case, the main and sub mobile communication terminals  10  and  30  may be used independently as independent mobile communication terminals. Moreover, the main and sub mobile communication terminals  10  and  30  may be physically fixed and connected by a cable, in order to automatically end the UIM function of the sub mobile communication terminal  30  when the cable connection is made. 
         [0086]    Therefore, according to the communication system and the mobile communication terminal disclosed above, the information of one mobile communication terminal may be used to simultaneously enable communications in a plurality of mobile communication terminals using different communication protocols, as described above. 
         [0087]    All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present invention have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.