Abstract:
A compound device has the structural hardware of a digital television, is connected to an antenna and a telephone station, and by reading out and running either a digital television (DTV) program or a base station program with a general processor, it has both the function of a digital television and the function of a portable telephone base station. The owner of the compound device receives discounts in their subscribed telephone fee or their power fee based on records in a communication record portion. Thus, a compound device in which a digital television is given the function of a portable telephone base station is provided, so that a novel infrastructure can be achieved in which insufficiencies in base stations are made up for without requiring equipment investment expenditures and portable device owners are given financial benefits in compensation for allowing the public use of their private possession as a portable telephone base station.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to a compound device in which the function of a portable telephone base station has been incorporated into a consumer information processing device such as a digital television.  
           [0003]    2. Description of Related Art  
           [0004]    Portable telephones recently have become remarkably widespread. The increasing number of portable telephones, however, requires increased construction of portable telephone base stations (hereinafter, referred to as base stations) for relaying between portable telephones and telephone stations. As shown in FIG. 17, base stations send/receive with a particular portable telephone within the range reached by the electromagnetic waves, and for example send/receive, via cable, information or the like communicated over the portable telephone to and from the telephone station.  
           [0005]    Constructing base stations, however, creates problems for telephone companies because an equipment investment of course is required, and the greater the increase in the number of portable telephone subscribers, the larger the burden this equipment investment becomes.  
         SUMMARY OF THE INVENTION  
         [0006]    Accordingly, it is a primary object of the present invention to make up for insufficiencies in portable telephone base stations without increasing the equipment investment burden of the telephone companies by providing a compound device in which a consumer information processing device, such as a digital television, used for example in an ordinary household has been given the function of a potable telephone base station.  
           [0007]    A compound device of the present invention for achieving the above object is connected to an antenna device and a communications line in communication with a telephone station, and is provided with a first function portion for receiving and processing electromagnetic waves for a consumer information processing device via the antenna device, and a second function portion for processing as a portable telephone base station via the antenna device and the communications line.  
           [0008]    Thus, a compound device purchased as a consumer information processing device and installed in an ordinary home or the like also functions as a base station for portable telephones, so that an insufficiency in base stations for portable telephones can be compensated without increasing the equipment investment burden of telephone companies.  
           [0009]    It is preferable that the consumer information processing device is a digital television receiver device or an image processing device for digital television.  
           [0010]    It is preferable that in the compound device the antenna device converts electromagnetic waves for digital television into analog signals for digital television, converts electromagnetic waves for portable telephone into analog signals for portable telephone, and converts analog signals for portable telephone into electromagnetic waves for portable telephone. It also is preferable that the compound device is provided with an analog signal processing portion for digital television for inputting analog signals for digital television from the antenna device and converting them into digital data for digital television, an analog signal processing portion for portable telephone base stations for converting the analog signals for portable telephones converted by the antenna device into digital data for portable telephones and converting the digital data for portable telephones into analog signals for portable telephones, a digital data processing portion for processing digital data in accordance with a program that has been read out, a digital television program storage portion for storing a program for converting digital data for digital television converted by the analog signal processing portion for digital television into image data and sound data, and a portable telephone program storage portion for storing a program for converting the digital signals for portable telephones converted by the analog signal processing portion for portable telephone base stations into portable telephone communication information and outputting to the communications line, and converting the portable telephone communication information input from the communications line into digital data for portable telephones and outputting to the analog signal processing portion for portable telephone base stations.  
           [0011]    This configuration makes it easy to control whether to function as a digital television or as a portable telephone base station by having a selection portion select a program to be read out by the digital data processing portion from either the program stored in the digital television program storage portion or the program stored in the portable telephone program storage portion.  
           [0012]    In the compound device, it is preferable that the selection portion selects the program stored in the portable telephone program storage portion as the program to be read out by the digital data processing portion if output from the analog signal processing portion for portable telephone base stations is a valid value.  
           [0013]    Thus, the compound device operates as the base station for portable telephones only if it is necessary that the portable telephone communication information is relayed, and at all other times it can operate as a consumer information processing device such as a digital television. Consequently, it is possible to achieve a compound device that functions as a consumer information processing device and functions as a portable telephone base station where necessary.  
           [0014]    In the compound device, it is preferable that the digital data processing portion is capable of executing the program stored in the digital television program storage portion and the program stored in the portable telephone program storage portion in parallel.  
           [0015]    For example, if the digital data processing device is achieved by a processor capable of executing a plurality of tasks in parallel, then the program stored in the digital television program storage portion and the program stored in the portable telephone program storage portion can be run in parallel. Accordingly, a compound device can be provided that operates as a digital television while simultaneously also operating as a portable telephone base station.  
           [0016]    In the compound device, it is preferable that the selection portion selects the program stored in the portable telephone program storage portion as the program to be read out by the digital data processing portion in the case where digital data for portable telephones are output to the digital data processing portion from the analog signal processing portion for portable telephone base stations and only if the communications line is not in use by a communications tool other than the portable telephone.  
           [0017]    This configuration, for example, enables the compound device to operate as a portable telephone base station only when, in the household where the compound device has been installed, the communications line (telephone line, for example) connecting the compound device and the telephone station is not in use by communications tools such as a connected telephone, facsimile, or computer in that household in the case where the communications line also is connected to the communications tools. Consequently, the compound device can be allowed to function as a portable telephone base station without affecting other communications tools using the communications line in the household or the like in which the compound device has been set up.  
           [0018]    In the compound, device it is preferable that the selection portion selects the program stored in the portable telephone program storage portion as the program to be read out by the digital data processing portion in the case where digital data for portable telephones are output to the digital data processing portion from the analog signal processing portion for portable telephone base stations and only if the digital data processing portion is not executing the program stored in the digital television program storage portion.  
           [0019]    According to this configuration, in the case where the compound device is functioning as a digital television, that compound device is not operating as a portable telephone base station, and the compound device to be used as a portable telephone base station only when the owner of the compound device is not using the compound device as a digital television. Thus, the compound device can be allowed to function as a portable telephone base station while the owner of the compound device is ensured priority use.  
           [0020]    It is preferable that the compound device is provided with a communication record portion for storing portable telephone communication records, and that it sends the stored communication records to the communications line. Thus, the communication records for the portable telephones can be forwarded to the telephone station or the like connected to the compound device by the communications line, and the communications records can be used in diverse applications.  
           [0021]    Additionally, to achieve the above object, a telephone station device according to the present invention is connected to this compound device via the communications line and is provided with a communication records storage portion for receiving and storing portable telephone communication records sent from the compound device. Consequently, the telephone station stores the portable telephone communication records relayed by the compound device, so that these communication records can be used in various applications at the telephone station.  
           [0022]    It is preferable that the telephone station device is provided with a telephone fee calculation portion for calculating a discount amount based on the communication records in the communication records storage portion and subtracting the discount amount from the usage fee of a subscribed telephone at the site where the compound device is established.  
           [0023]    This configuration, for example, allows a discount in an amount corresponding to how long, for example, the compound device functioned as a portable telephone base station to be applied suitably to the telephone fee for a subscribed telephone in the household or the like where the compound device has been installed. Accordingly, the owner of the compound device gains financial benefit by receiving a discounted telephone bill as compensation for providing their own compound device for public use. A further advantage is that the reception of such financial benefits will generate consumer appeal for the compound devices and encourage the spread of the compound devices.  
           [0024]    Additionally, to achieve the above object, a power supply system according to the present invention includes a power supply device for supplying power to the compound device and a management device connected to the compound device via a communications line, and the management device is provided with a power fee calculation portion for calculating a discount amount based on portable telephone communication records sent from the compound device and subtracting the discount amount from the fee for the power supplied to the site where the compound device is installed.  
           [0025]    This configuration, as with the telephone fee mentioned above, for example allows a discount in an amount corresponding to how long, for example, the compound device functioned as a portable telephone base station to be suitably applied to the power fee for the household or the like where the compound device has been installed. Accordingly, the owner of the compound device gains financial benefit by receiving a discounted power bill as compensation for providing their compound device for public use. A further advantage is that the reception of such financial benefits will spur consumer desire to purchase the compound devices and encourage the spread of the compound devices.  
           [0026]    To achieve the above object, a portable telephone system according to the present invention has a plurality of base stations including a compound device and a telephone station device connected to the base stations via a communications line, and the telephone station device is provided with a base station selection portion for selecting, from the plurality of base stations, a base station for relaying communication with the portable telephone designated as the party with which communication is to be established.  
           [0027]    Thus, the telephone station device can select the compound device according to the present invention, in addition to a conventional portable telephone base station, as a relay base station. Consequently, a portable telephone system having a sufficient number of base stations for the number of portable telephones can be realized without increasing the telephone company&#39;s equipment investment.  
           [0028]    In the portable telephone system, the base station selection portion can select the base station with which electromagnetic waves from the portable telephone can be received under the best conditions, irrespective of whether the base station is the compound device. Thus, the relay base station with the best electromagnetic wave reception conditions can be selected from the plurality of base stations including compound devices in addition to conventional portable telephone base stations, so that a portable telephone system with which portable telephone users always can be provided the best communication quality can be achieved.  
           [0029]    Alternatively, in the portable telephone system, the base station selection portion may also select with priority a base station other than the compound device from among the base stations capable of receiving electromagnetic waves from the portable telephone. This means that giving priority to the selection of conventional portable telephone base stations over compound devices and using the compound devices, which are private possessions, in an ancillary fashion makes it possible to compensate for the insufficiencies in base stations only where necessary without placing an excessive burden on the compound devices.  
           [0030]    In the portable telephone system, it is preferable that a base station transfer request is output to the base station selection portion from the compound device when an input requesting that a compound device functioning as a base station for portable telephones functions as the consumer information processing device is received, and the base station selection portion transfers the base station for relaying communication between it and a portable telephone to a base station other than the compound device.  
           [0031]    With this configuration, for example, in the case where the owner of a compound device wishes to use their compound device as a consumer information processing device such as a digital television when the compound device is functioning as a relay base station, the function for serving as a relay base station is transferred to another base station (including another compound device). Consequently, the owner of the compound device is given top priority for use of their compound device while the compound device can be allowed to function as a base station.  
           [0032]    In the portable telephone system, it is preferable that the base station selection portion transfers the base station for relaying communication between it and a portable telephone to a base station other than the compound device when the compound device is functioning as a base station for a portable telephone, and a request for communication with respect to a communications tool at the site where the compound device is installed and connected to the communications line is received.  
           [0033]    With this configuration, for example in the case where the communications line (telephone line, for example) connecting the compound device and the telephone station is also connected to communications tools such as the household subscribed telephone, facsimile device, or computer in the household where the compound device is installed, the function for serving as a relay base station is transferred to another base station (including other compound devices) when a request for communication with these communications tools is received. Consequently, the compound device can be made to operate as a portable telephone base station without affecting the other communications tools using the communications line in the household or the like where the compound device is installed.  
           [0034]    In the portable telephone system it is preferable that a base station transfer request is output from the compound device to the base station selection portion and the base station selection portion transfers the base station for relaying communication between it and a portable telephone to a base station other than the compound device, when the compound device is functioning as a base station for a portable telephone, and a request for the use of a communications tool at the site where the compound device is installed and that is connected to the communications line is received.  
           [0035]    With this configuration, for example, in the case where the communications line (telephone line, for example) connecting the compound device and the telephone station also is connected to communications tools such as the household subscribed telephone, facsimile device, or computer in the household or the like where the compound device is installed, the function for serving as a relay base station is transferred to another base station (including other compound devices) when an attempt is made to use these communications tools. Consequently, the compound device can be made to operate as a portable telephone base station without affecting the other communications tools using the communications line in the household or the like where the compound device is installed.  
           [0036]    A program according to the present invention makes a computer function as a compound device having a function for serving as an image processing device for digital television and a function for serving as a base station for portable telephones. The computer is connected to an antenna device that converts electromagnetic waves for digital television into analog signals for digital television, converts electromagnetic waves for portable telephones into analog signals for portable telephones, and converts analog signals for portable telephones into electromagnetic waves for portable telephones, and is connected to a telephone station over a communications line. The computer is provided with a digital television program storage portion, a portable telephone program storage portion, and a digital data processing portion. The digital television program storage portion stores a program for converting digital data for digital television converted by the analog signal processing portion for digital television into image data and sound data. The portable telephone program storage portion stores a program for converting digital signals for portable telephones converted by the analog signal processing portion for portable telephone base stations into portable telephone communication information and outputting to the communications line, and converting the portable telephone communication information input from the communications line into digital data for portable telephones and outputting to the analog signal processing portion for portable telephone base stations. The digital data processing portion processes digital data in accordance with the program that is read out. The computer is made to execute a digital television analog signal process for inputting analog signals for digital television from the antenna device and converting these into digital data for digital television, a portable telephone base station analog signal process for converting analog signals for portable telephones converted by the antenna device into digital data for portable telephones and converting digital data for portable telephones into analog signals for portable telephones, and a selection process for selecting a program to be read out by the digital data processing portion from the program stored in the digital television program storage portion and the program stored in the portable telephone program storage portion. Running this program on the computer makes it possible to achieve an aforementioned compound device with the computer. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0037]    [0037]FIG. 1 is a block diagram showing the structure of the compound device according to an embodiment of the present invention.  
         [0038]    [0038]FIG. 2 is an explanatory drawing showing an example of the communication records stored in the communication record portion of the compound device.  
         [0039]    [0039]FIG. 3 is a flowchart showing the monitor program controlled operation of the general processor in the compound device.  
         [0040]    [0040]FIG. 4 is a flowchart showing details of the process in step  301  of FIG. 3.  
         [0041]    [0041]FIG. 5 is a flowchart showing details of the process in step  302  of FIG. 3.  
         [0042]    [0042]FIG. 6 is a flowchart showing details of the process in step  303  of FIG. 3.  
         [0043]    [0043]FIG. 7 is a flowchart showing the base station program controlled operation of the general processor in the compound device.  
         [0044]    [0044]FIG. 8 is a block diagram showing the structure of the portable telephone system including the compound device.  
         [0045]    [0045]FIG. 9 is an explanatory drawing showing an example of the telephone records information recorded by the telephone station in the portable telephone system including the compound device.  
         [0046]    [0046]FIG. 10 is an explanatory drawing showing an example of the power supply information recorded by the power company.  
         [0047]    [0047]FIG. 11 is a flowchart showing the procedure of the process in which the telephone station establishes communication with a portable telephone.  
         [0048]    [0048]FIG. 12 is a flowchart showing the details of the process in step  11001  of FIG. 11.  
         [0049]    [0049]FIG. 13 is a flowchart showing the details of the process in step  11002  of FIG. 11.  
         [0050]    [0050]FIG. 14 is a flowchart showing the details of the process in step  11003  of FIG. 11.  
         [0051]    [0051]FIG. 15 is a flowchart showing the process by which the telephone station calculates the telephone fee.  
         [0052]    [0052]FIG. 16 is a flowchart showing the process by which the power company calculates the power fee.  
         [0053]    [0053]FIG. 17 is a block diagram showing the structure of a conventional portable telephone system. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0054]    Hereinafter, embodiments of the compound device according to the present invention will be described in detail with reference to the drawings.  
         [0055]    First, the structure of the compound device will be described.  
         [0056]    [0056]FIG. 1 shows details of the internal configuration of the compound device according to this embodiment and the relationship in how it connects with other tools.  
         [0057]    As shown in FIG. 1, a compound device  10  may have the outer appearance of a digital television (hereinafter, abbreviated as DTV), is provided with a TV tuner  100 , a portable telephone tuner  101 , a general processor  102 , a communication record portion  103 , a display  107 , and a speaker  108 , and is connected to an antenna  110 .  
         [0058]    Additionally, the compound device  10  is connected to a telephone station  111  (actually, a switchboard of the telephone station) by a cable  112 , and the general processor  102  sends/receives information communicated over a portable telephone between itself and the switchboard of the telephone station  111  via the cable  112 . In addition to sound data, communicated information also includes character data and image data used by the portable telephone. Moreover, there is actually a communications control device such as a modem between the general processor  102  and the cable  112 , but since this configuration is well known, it has been omitted from the drawings.  
         [0059]    It should be noted that communications tools (not shown) such as an ordinary telephone, a facsimile, or a personal computer in the household in which the compound device  10  has been installed also are connected to the telephone station  111  via the cable  112 . This means that the cable  112  is shared by communications tools (including the compound device  10 ) within the household.  
         [0060]    The antenna  110  outputs a DTV signal carried by electromagnetic waves of a frequency band for DTV to the TV tuner  100  as an analog signal, and outputs the communicated information, for example, carried by electromagnetic waves of a frequency band for portable telephones to the portable telephone tuner  101  as an analog signal. Additionally, the antenna  110  transmits the analog signal received from the portable telephone tuner  101  as electromagnetic waves of a frequency band for portable telephones.  
         [0061]    The TV tuner  100  converts the DTV signal input from the antenna  110  as an analog signal into digital data and outputs to the general processor  102 . The portable telephone tuner  101  has a function for converting information communicated over a portable telephone, for example, from an analog signal into digital data or conversely from digital data into an analog signal. This means that the portable telephone tuner  101  converts the analog signal of the portable telephone that is input from the antenna  110  into digital data and outputs these data to the general processor  102 , whereas it converts the digital, data of the portable telephone that are input from the general processor  102  into an analog signal and outputs to the antenna  110 .  
         [0062]    The general processor  102  achieves the DTV function and the portable telephone base station function of the compound device  10  by executing digital calculations in concert with programs. It should be noted that the programs for controlling how the general processor  102  operates are for example a DTV program  104 , a base station program  105 , and a monitor program  106 . Details on how each of these programs operates are discussed later.  
         [0063]    The communication record portion  103  stores communication records relating to the party communicated with and the time of communication, for example, if the compound device  10  functions as a portable telephone base station.  
         [0064]    The DTV program  104  is a program for running on the general processor  102  a process through which the digital data of the DTV are converted into image data and sound data. The base station program  105  converts digital data for the portable telephone into communication information if these data are inputted, and if communication information is inputted, it executes a process on the general processor  102  for converting this information into digital data. This program also makes the general processor  102  execute a process for creating and storing communication records if the compound device  10  functions as a portable telephone base station. The monitor program  106  is resident in the general processor  102  and controls the compound device  10  by making the general processor  102  manage inputting and outputting.  
         [0065]    The display  107  displays the image data as moving pictures, and the speaker  108  outputs the sound data as sound. Accordingly, the compound device  10  functions as a DTV.  
         [0066]    [0066]FIG. 2 shows the structure of the communication record data stored in the communication record portion  103 . Each time the compound device  10  functions as a base station, the three factors of the date, the start time, and the end time serve as the unit for the communication records and are accumulated and recorded in the communication record portion  103 .  
         [0067]    Hereinafter, the operation of the compound device  10  will be described.  
         [0068]    [0068]FIG. 3 is a flowchart illustrating how the monitor program  106  controls the operation of the general processor  102 .  
         [0069]    When the compound device  10  is activated, the general processor  102  loads and starts running the monitor program  106 .  
         [0070]    First, the general processor  102  determines whether there has been input to operate the DTV function from the user of the compound device  10  (step  31 ). If the result determined in step  31  is yes, then the general processor  102  creates a task for the DTV function (step  301 ). Details of the process in step  301  are discussed later.  
         [0071]    Next, the general processor  102  determines whether there has been input of digital data with respect to the portable telephone from the portable telephone tuner  101  (step  32 ). If the result determined in step  32  is yes, then the general processor  102  creates a task for the base station function for the case that a portable telephone signal is received (step  302 ). Details of the process in step  302  are discussed later.  
         [0072]    Next, the general processor  102  determines whether there is a request from the telephone station  111  to establish communication (step  33 ). If the result determined in step  33  is yes, then the general processor  102  creates a task for the base station function for the case that there is a request from the telephone station to establish communication (step  303 ). Details of the process in step  303  are discussed later.  
         [0073]    Then, the general processor  102  determines whether there is a request from the telephone station  111  to transfer the data of the communication record portion  103  (step  34 ). If the result determined in step  34  is yes, then the general processor  102  transfers the data of the communication record portion  103  to the telephone station  111  (step  35 ).  
         [0074]    Next, the general processor  102  determines whether there is input from the user of the compound device  10  for using an ordinary telephone (step  36 ). As mentioned before, communications tools such as an ordinary telephone in a household where the compound device  10  has been installed are, as the compound device  10 , connected to the telephone station  111  via the cable  112 , and for example, picking up the receiver of the telephone inputs a signal indicating the use of the cable  112  by the ordinary telephone to the compound device  10 . This signal can be output by the ordinary telephone or a multipoint connector or the like for connecting the cable  112  and the communications tools (including the compound device  10 ) in the household.  
         [0075]    If the result determined in step  36  is yes, then the general processor  102  executes a step  304 . Here, if the base station function is already in operation, then a request to transfer is sent to the telephone station  111 , and if the transfer is allowed, the general processor  102  stops operating the base station function. This is the same process, without step  45 , as that of the flowchart in FIG. 4 mentioned later.  
         [0076]    The general processor  102  repeats steps  31  to  36  (step  304 ).  
         [0077]    Here, FIG. 4 shows in detail the process of step  301 .  
         [0078]    (1) First, whether the general processor  102  is already executing the base station program  105  as a separate task is determined (step  41 ).  
         [0079]    (2) If in step  41  this is determined to be yes, then a request to transfer to another compound device is sent to the telephone station  111  to establish on another compound device the communication presently being carried out (step  42 ).  
         [0080]    (3) Next, it is determined whether permission to transfer has been input to the general processor  102  from the telephone station  111  in response to the process in step  42  (step  43 ).  
         [0081]    (4) If in step  43  this is determined to be yes, then the base station program  105  being executed by the general processor  102  is stopped (step  44 ).  
         [0082]    (5) Only if in step  41  the result is no or the process of step  44  has been performed, is the DTV program  104  executed by the general processor  102  as a separate task (step  45 ).  
         [0083]    Step  302  is detailed below, in accordance with the flowchart shown in FIG. 5.  
         [0084]    (1) First, it is determined whether the cable  112  is in use for communication with an ordinary telephone or other household device (step  51 ).  
         [0085]    (2) In step  52 , it is determined whether the general processor  102  is already executing the DTV program.  
         [0086]    (3) In step  53 , it is determined whether there is a request from the telephone station  111  to establish communication.  
         [0087]    (4) In the case where no is determined in step  51  and step  52  and yes is determined in step  53 , the base station program  105  is executed by the general processor  102  as a separate task (step  54 ).  
         [0088]    Step  303  is detailed below, in accordance with the flowchart shown in FIG. 6.  
         [0089]    (1) First, a signal for confirming the existence of the portable telephone designated by the telephone station  111  is transmitted from the portable telephone tuner  101  via the antenna  110  (step  60 ).  
         [0090]    (2) Next, the general processor  102  determines whether the portable terminal has responded to the signal of step  60  (step  61 ). That is, the general processor  102  determines whether there is input from the portable tuner  101  of digital data of the response from the portable telephone.  
         [0091]    (3) If in step  61  this is determined to be yes, then digital data from the designated portable telephone are received and a process for notifying the telephone station  111  that communication can be established is performed (step  62 ). If in step  61  this is determined to be no, then the process of step  303  is ended.  
         [0092]    (4) In step  63 , it is determined whether there is another request from the telephone station  111  to establish communication.  
         [0093]    (5) If in step  63  this is determined to be yes, then the base station program  105  is executed by the general processor  102  as a separate task (step  64 ). If in step  63  this is determined to be no, then the process in step  303  is ended.  
         [0094]    The base station program  105  is executed by the general processor  102  as detailed below, in accordance with the flowchart shown in FIG. 7.  
         [0095]    (1) First, a region for recording new communication records information like that shown in FIG. 2 is created in the communication record portion  103  (step  71 ).  
         [0096]    (2) Next, the date and start time of communication is recorded in the communication records information region that is created (step  72 ).  
         [0097]    (3) Digital data of the portable telephone are sent and received (step  73 ). It should be noted that step  73  is repeated until there is input from the portable telephone tuner  101  or the telephone station  111  of a signal for ending communication, that is, while the result determined in step  74  is no.  
         [0098]    (4) When a signal for ending communication is input from the portable telephone tuner  101  or the telephone station  111  (yes is determined in step  74 ), the end time of the communication is recorded in the communication records information region created in step  71  (step  75 ).  
         [0099]    The overall configuration of the portable telephone system including the compound device as a base station according to the present embodiment is described next.  
         [0100]    [0100]FIG. 8 shows the configuration of the portable telephone system. Compound devices  81 ,  82 , and  83  are the same as the compound device  10  shown in FIG. 1, and each is connected to an antenna and cables. Portable telephones  84  and  85  are portable telephones commonly known in the art. The compound devices  81 ,  82 , and  83  are connected to a telephone station  86  (actually, to a switchboard of the telephone station) by cables  811 ,  821 , and  831 , respectively. The telephone station  86  has been provided with a fee calculation portion  861 .  
         [0101]    A power company  87  supplies power to the compound devices  81 ,  82 , and  83 . However, the electrical wiring for supplying power has been omitted in FIG. 8. The power company  87  is connected to the telephone station  86  by a cable  871 . The power company  87  also has been provided with a fee calculation portion  872 . A portable telephone base station  88  is widely known in the art, and is connected to the telephone station  86  through a cable  881 .  
         [0102]    [0102]FIG. 9 shows an example of the telephone records information recorded by the telephone station  86 . The unit for the telephone records information includes five factors: the identification number of the cable used in communication, the date of the communication, the start time and the end time of the communication, and the other party&#39;s number. FIG. 10 shows an example of the power supply information recorded by the power company  87 . The unit of power supply information includes two factors: the identification number of the home supplied with power, and the supplied power.  
         [0103]    The description in FIG. 9 has been made readily understandable by using the cable reference numbers shown in FIG. 8 for the identification number of the cable, but the actual identification numbers used are assigned to each cable by the telephone company, for example. It also is possible to use the telephone number of the subscribed telephone in place of the identification number of the cable. Similarly, the purpose behind using the numbers  205 ,  207 , and  212  in the example shown in FIG. 10 as the identification numbers for the homes is to represent the number for the homes in which the compound devices  81  to  83  shown in FIG. 8 are installed. The numbers actually used are assigned to each home by the power company, for example.  
         [0104]    [0104]FIG. 11 is a flowchart showing the process in which the telephone station  86  establishes communication over a portable telephone. The steps  11001 ,  11002 , and  11003  of FIG. 11 are detailed in FIGS. 12, 13, and  14 , respectively. FIG. 15 is a flowchart showing the process by which the telephone station  86  calculates the telephone fee. FIG. 16 is a flowchart showing the process by which the power company  87  calculates the power fee.  
         [0105]    First, the operation by which this portable telephone system establishes communication with a portable telephone is described according to the flowcharts in FIGS.  11  to  14 . Here, the compound devices  81 ,  82 , and  83  operate as mentioned earlier, and the description centers on the operation of the telephone station  86 .  
         [0106]    The telephone station  86  constantly executes the process according to the flowchart of FIG. 11. This process is executed in the following steps.  
         [0107]    (1) In step  1101 , the telephone station  86  determines whether there has been input from the portable telephone base station  88  of a request to establish communication. This is determined to be yes in the case where (a) the portable telephone base station  88  receives a request to establish communication from a portable telephone within its station area, (b) the portable telephone base station  88  outputs a request to establish communication in order to search for the portable telephone designated as the other party in the request to establish communication, and (c) that request is input to the telephone station  86  via the cable  881 .  
         [0108]    (2) If in step  1101  this is determined to be yes, then the telephone station  86  searches among the compound devices  81 ,  82 , and  83  for a compound device that can communicate with the portable telephone designated as the other party in the request to establish communication, and performs a process for establishing communication (step  11001 ).  
         [0109]    (3) In step  1102 , the telephone station  86  determines whether there is a request to establish communication from any of the compound devices  81 ,  82 , and  83 . This is determined to be yes in the case where (a) any of the compound devices  81 ,  82 , and  83  receives a request to establish communication from a portable telephone, (b) that compound device outputs a request to establish communication in order to search for the portable telephone serving as the other party, and (c) that request is input to the telephone station  86  via any of the cables  811 ,  821 , and  831 .  
         [0110]    (4) If in step  1102  this is determined to be yes, then the telephone station  86  searches among the other compound devices and the portable telephone base stations  88  for a compound device or a portable telephone base station  88  capable of communicating with the portable telephone designated as the other party in the request to establish communication in step  1101 , and carries out a process for establishing communication (step  11002 ).  
         [0111]    (5) In step  1103 , the telephone station  86  determines whether there has been input for a transfer request from any of the compound devices  81 ,  82 , and  83 . The operation by which a compound device outputs a transfer request is the same as that described in the process of step  42  in FIG. 4, and thus the description thereof is omitted here.  
         [0112]    (6) If in step  1103  this is determined to be yes, then the telephone station  86  searches among the other compound devices and portable telephone base stations for a compound device or a portable telephone base station to which transfer is possible, and establishes communication (step  11003 ).  
         [0113]    (7) In step  1104 , the telephone station  86  determines whether there is a request to establish communication with an ordinary telephone or other household equipment that uses any of cables  811 ,  821 , and  831 . This communication request is output from an ordinary telephone not shown in FIG. 8 and is input to the telephone station  86 . “Ordinary telephone” used here refers to a telephone that does not employ mobile communications and that is a subscribed telephone installed in the same household as the compound devices  81 ,  82 , and  83 .  
         [0114]    (8) If in step  1104  this is determined to be yes, then the telephone station  86  further performs the determination of step  1105 . In step  1105 , the telephone station  86  determines whether a compound device connected to the cable used in the request to establish communication with an ordinary telephone is operating as a base station.  
         [0115]    (9) If in step  1105  this is determined to be yes, then the telephone station  86  searches among the other compound devices and the portable telephone base stations for a compound device or a portable telephone base station to which transfer is possible, and establishes communication therewith (step  11003 ).  
         [0116]    The telephone station  86  repeats the above steps (1) to (9).  
         [0117]    The above step  11001  is detailed below, in accordance with the flowchart shown in FIG. 12.  
         [0118]    (1) First, the telephone station  86  outputs a request to the compound devices  81 ,  82 , and  83  to establish communication in order to search for the portable telephone of the party to communicate with (step  1201 ).  
         [0119]    (2) Each of the compound devices input with the request of (1) determine whether communication can be established and notifies the telephone station  86  of whether communication can be established. This determination and process are equivalent to the determination in step  33  of FIG. 3 and a portion of the process of step  303 , that is, steps  60  to  62  in FIG. 6, and since they have been described previously, the details thereof are omitted here. In step  1202 , the telephone station  86  selects the compound device with the best communication conditions among the compound devices that notified the telephone station  86  that communication can be established, and once again outputs the request to establish communication to the selected compound device. The compound device receiving the second request to establish communication starts executing the base station function. The process of this compound device is equivalent to that of steps  63  and  64  of FIG. 6, and details thereof are omitted here because they have been described already. Consequently, in step  1202  the selected compound device functions as a base station and communication with the portable telephone base station  88  is established.  
         [0120]    Step  11002  is detailed below in accordance with the flowchart shown in FIG. 13.  
         [0121]    (1) First, the telephone station  86  outputs a request to the portable telephone base station  88  and the outer compound devices to establish communication in order to search for the portable telephone that is to be communicated with (step  1301 ).  
         [0122]    (2) The telephone station  86  next determines whether there is input to establish communication from the portable telephone base station  88  (step  1302 ).  
         [0123]    (3) If in step  1302  this is determined to be yes, then the telephone station  86  establishes communication between the compound device and the portable telephone base station  88  (step  1304 ).  
         [0124]    (4) If in step  1302  this is determined to be no, then the telephone station  86  selects the compound device with the best communication conditions among the compound devices from which input that communication can be established is received, and once again outputs a request to the selected compound device to establish communication, and establishes communication between the compound devices (step  1303 ).  
         [0125]    The procedure of the above step  11003  is detailed below in accordance with the flowchart shown in FIG. 14.  
         [0126]    (1) In order to establish communication in place of the compound device that has output the transfer request, the telephone station  86  first executes a process for outputting a request to establish communication to other compound devices and the portable telephone base station  88  (step  1401 ).  
         [0127]    (2) The telephone station  86  next determines whether there has been input to establish communication from the portable telephone base station  88  in response to the output from step  1401  (step  1402 ).  
         [0128]    (3) If in step  1402  this is determined to be yes, then the telephone station  86  executes a process for outputting permission to transfer to the compound device that has output the transfer request (step  1403 ). Next, a process is performed for making the portable telephone base station  88  establish communication (step  1404 ). On the other hand, the compound device that has output the transfer request stops functioning as a base station when the output from step  1403  is input. This process is equivalent to that of steps  43  and  44  of FIG. 4, and a description thereof is omitted here because this process has been detailed already.  
         [0129]    (4) If it is determined in step  1402  that this is no, then the telephone station  86  determines whether there is notification that communication can be established from a compound device of those that have output a request to establish communication in step  1401  (step  1405 ).  
         [0130]    (5) If it is determined in step  1405  that this is yes, then the telephone station  86  selects the compound device with the best communication conditions among the compound devices notifying that communication can be established, and once again outputs a request to establish communication (step  1406 ). The compound device that receives this request establishes communication. The process of this compound device is equivalent to that of steps  63  and  64  in FIG. 6, and since it has been described already, a description thereof is omitted here. Next, the telephone station  86  outputs a permission to transfer to the compound device that has output the transfer request (step  1407 ). The compound device that has output the transfer request receives this permission and stops operating as a base station. This process is equivalent to that of steps  43  and  44  in FIG. 4, and thus a description of the details thereof is omitted here because it has been made already.  
         [0131]    As is evident from the order of determinations in the steps  1101  and  1102  of FIG. 11 and the determination made in step  1302  of FIG. 13, this system gives priority to adopting the portable telephone base station  88 , rather than the compound devices  81 ,  82 , and  83 , as the base station when portable telephone communication is established.  
         [0132]    Next, how this portable telephone system operates when calculating telephone fees is described with reference to FIG. 15.  
         [0133]    For example, once per month only, the telephone station  86  activates the fee calculation portion  861  to calculate telephone fees. The process for calculating the telephone fees is carried out as follows, in accordance with the flowchart shown in FIG. 15.  
         [0134]    (1) First, the fee calculation portion  861  references the telephone records information, such as those shown in FIG. 9, stored in the telephone station  86 , calculates the telephone usage time from the start time and end time of the communication, and based on this and the other party&#39;s number, calculates the current month&#39;s telephone fees for each cable (step  1501 ).  
         [0135]    (2) Next, the fee calculation portion  861  requests the compound device connected to each of the cables to forward the data in its communication record portion  103  (step  1502 ).  
         [0136]    (3) Then, the fee calculation portion  861  calculates the usage fee for the compound devices for the current month based on the communication records transferred from each compound device (step  1503 ). The communication records transferred from the compound devices include, as shown in FIG. 2, the operation start time and end time for each instance a compound device functions as a portable telephone base station. Consequently, with these communications records, the fee calculation portion  861  finds the total time that each compound device functioned as a portable telephone base station during the current month, and calculates a fee corresponding to the time that is found as the compound device usage fee.  
         [0137]    (4) Next, the fee calculation portion  861  subtracts the compound device usage fee calculated in step  1503  from the telephone fee calculated in step  1501  (step  1504 ). That is, this is a system in which the owner of a compound device is given financial benefit as compensation for allowing their compound device to be used for another person&#39;s portable telephone by discounting their telephone fee by the amount corresponding to the time that their compound device functioned as a portable telephone base station. Consequently, the longer a compound device functions as a portable telephone base station, the greater the amount that the telephone fee is discounted.  
         [0138]    (5) The fee calculation portion  861  repeats steps (1) to (4) for all cables (step  1505 ).  
         [0139]    Hereinabove, the operation for calculating the telephone fee according to the portable telephone system of this embodiment was described. However, the financial benefits given to the owner of a compound device are not limed to a discounted telephone fee. Another example of such financial benefits is described below with reference to FIG. 16. In this system, the power fee of the owner of the compound device is discounted in accordance with the time that their compound device functions as a portable telephone base station.  
         [0140]    The power company  87 , for example, once a month only, activates the fee calculation portion  872  to calculate the power fee. The power fee is calculated as follows and in accordance with the flowchart shown in FIG. 16.  
         [0141]    (1) First, the fee calculation portion  872  selects a household for which to perform calculations, and it calculates the current month&#39;s power fee for that household based on the power supply information shown in FIG. 10 (step  1601 ).  
         [0142]    (2) The fee calculation portion  872  next requests the telephone station  86  to forward the communication records for the compound device installed in that household (step  1602 ).  
         [0143]    (3) As in step  1503  above, the fee calculation portion  872  then calculates that month&#39;s compound device usage fee based on the communication records forwarded from the telephone station  86  (step  1603 ).  
         [0144]    (4) The fee calculation portion  872  then subtracts the compound device usage fee calculated in step  1603  from the power fee calculated in step  1601  (step  1604 ).  
         [0145]    (5) The fee calculation portion  872  repeats the procedure of steps (1) to (4) for remaining households.  
         [0146]    With the procedure of steps (1) to (5), the power fee for a household in which the compound device is installed is discounted in accordance with the time that the compound device functioned as a portable telephone base station, and the owner of the compound device can be rewarded financially in return for allowing their compound device to be used as a portable telephone base station by another person.  
         [0147]    It should be noted that the amount lost by the telephone company or the power company through discounting the telephone fee or the power fee conceivably could be compensated by, for example, the portable telephone company paying an equivalent fee to the telephone company or the power company.  
         [0148]    As set forth above, with this embodiment a portable telephone company benefits from a digital television jointly functioning as a portable telephone base station because it can reduce its equipment investment for building more portable telephone base stations. Similarly, there are financial merits for consumers purchasing a digital television that serve as a compound device in that the power fee for their home or the telephone fee for their subscribed telephone receives a discount for an amount corresponding to the time that their compound device functions as a portable telephone base station. Moreover, manufacturers of digital televisions that serve as compound devices also benefit because these financial merits will fuel consumer appeal and encourage the spread of the digital televisions.  
         [0149]    In the above description, one embodiment of the compound device and the portable telephone system including the compound device as a base station according to the present invention has been discussed, but the present invention is not limited to this embodiment.  
         [0150]    For example, the consumer information processing device making up the compound device was illustratively a digital television in this embodiment, but it also may be a computer or other household electronics that functions in the same manner as a digital television in the context of the present invention.  
         [0151]    Additionally, in the above description the example illustrated was of the general processor  102  selectively executing either the DTV program  104  or the base station program  105 . However, in the case where the general processor  102  is capable of executing multiple tasks in parallel, the DTV program  104  and the base station program  105  can be run simultaneously as separate tasks to achieve the two functions at once. In this case, the determinations made in steps  41  and  43  and the processes of steps  42  and  44  in FIG. 4, and the determination of step  1103  and the process of step  11003  in FIG. 11 can be omitted.  
         [0152]    Furthermore, in this embodiment the communication records were stored in the communication record portion  103  of the compound device and where necessary the communication records were forwarded to the telephone station, but communication records for the compound device also can be sent from the compound device to the telephone station at each time, with the telephone station accumulating and storing them. Additionally, in the example shown, the amount corresponding to the time that the compound device functions as a base station is discounted from the telephone fee or the power fee. However, it is also possible to discount by an amount corresponding to the amount of information relayed by the compound device serving as a base station, in which case the amount of relayed information, instead of the start time and the end time, should be stored in the communication records.  
         [0153]    The telephone stations  111  and  86  are not limited to the telephone stations of telephone companies, and also can be CATV stations or telephone stations for Internet telephone.  
         [0154]    Additionally, in the above description an example was presented in which the present invention was implemented by hardware (the compound device and the portable telephone system including it), but the present invention can also be implemented as software (as programs). That is, the object of the present invention can be achieved by running a program that executes the processes shown in FIGS.  3  to  6  on a computer, a program that executes the processes shown in FIG. 7 on a computer, a program that executes the processes shown in FIGS.  11  to  14  on a computer, and a program that executes the process shown in FIGS. 15 and 16 on a computer, each being stored on some program storage medium, such as a CD-ROM, and read by a computer, or downloaded to a computer over a communications line, and each program run on the computer.  
         [0155]    As set forth above, according to the present invention, a compound device having the functions of a portable telephone base station and a digital television can be achieved, and moreover a portable telephone system using this compound device can be achieved. This means that the present invention achieves a useful communications infrastructure for portable telephones that has significant practical value.  
         [0156]    The invention may be embodied in other forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed in this application are to be considered in all respects as illustrative and not limiting. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.