Patent Publication Number: US-2022232284-A1

Title: Display apparatus, information terminal and information processing method

Description:
TECHNICAL FIELD 
     The present invention relates to a display apparatus, an information terminal and an information processing method, and particularly relates to a technique effective for viewing content with using a plurality of terminal apparatuses. 
     BACKGROUND ART 
     In recent years, distribution services that distribute content such as movies and music via the internet have been widely used. For example, Patent Document 1 is known as such a distribution service. Patent Document 1 describes that “there is provided a network terminal system that allows a display apparatus to be shared between a plurality of users while protecting privacy of each user”, and describes a technique that allows the television receiver to be shared between a plurality of users and to be selectively used while protecting the privacy of each user by using a wireless terminal to operate a television receiver. 
     RELATED ART DOCUMENTS 
     Patent Documents 
     Patent Document 1: Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. JP-T-2014-080508 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     However, the above-described technique of Patent Document 1 is insufficient in terms of user-friendliness in various usage environments and usage situations. 
     For example, in a case where a plurality of users simultaneously share and use a television receiver which is a display apparatus in Patent Document 1, each user subscribed to a content distributer, or the so-called content provider, is likely to have a subscription such as an available service division that differs from another user. For this reason, each user would need to perform, for example, a login operation every time the content to be viewed is switched, causing a problem of poor user-friendliness. 
     An object of the present invention is to provide a technique in which content and the like can be efficiently provided when a display apparatus is shared with utilizing a plurality of terminal apparatuses, even if the service divisions differ between each user. 
     The above-described object, other objects and novel features of the present invention will be apparent from the descriptions in the present specification and the attached drawings. 
     Means for Solving the Problems 
     A brief summarized description of a representative embodiment according to the invention disclosed in the present application is as follows. 
     Namely, a representative display apparatus is connected to two or more information terminals via a first network and is connected to a content distribution apparatus via a second network, the content distribution apparatus configured to distribute content. 
     This display apparatus includes an information controller, a content controller, an aggregated content generator and a first display. The information controller sends each piece of login information entered from the two or more information terminals to a content distribution apparatus. The content controller obtains pieces of content list information each generated by the content distribution apparatus based on the pieces of login information sent from the content distribution apparatus. 
     The aggregated content generator generates an aggregated content list in which the pieces of content list information obtained from the content distribution apparatus by the content controller are aggregated. The first display displays the aggregated content list generated by the aggregated content generator. 
     The content list information is information containing a list of content available for viewing on each of the information terminals connected to the display apparatus via the first network. The aggregated content list is information containing a list of content available for viewing on the two or more information terminals in which the pieces of content list information are aggregated. 
     In addition, the information controller generates aggregated login information in which the pieces of login information entered from each of the two or more information terminals logging in on a group basis are aggregated, sends the aggregated login information to the content distribution apparatus, receives aggregated service information generated by the content distribution apparatus based on the aggregated login information from the content distribution apparatus, and sends the received aggregated service information to the information terminals. 
     The aggregated service information sent from the information controller is information indicating an added value obtained when the two or more information terminals log in to the content distribution apparatus on a group basis. 
     In particular, the aggregated service information received by the information controller includes split payment information as the added value, the split payment information indicating that a viewing fee of the content can be split between the two or more information terminals logged in on a group basis. 
     Effects of the Invention 
     A brief description of an effect obtained by the representative embodiment according to the invention disclosed in the present application is as follows. 
     It is possible to achieve a highly convenient network terminal system. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram showing a configuration example of a network terminal system according to a first embodiment; 
         FIG. 2  is an explanatory drawing showing a configuration example of a television receiver within the network terminal system of  FIG. 1 ; 
         FIG. 3  is an explanatory drawing showing a configuration example of a wireless terminal within the network terminal system of  FIG. 1 ; 
         FIG. 4  is an explanatory drawing showing a configuration example of a content distribution server within the network terminal system of  FIG. 1 ; 
         FIG. 5  is an explanatory drawing showing configuration examples of a memory and a storage within the television receiver of  FIG. 2 ; 
         FIG. 6  is an explanatory drawing showing configuration examples of a memory and a storage within the wireless terminal of  FIG. 3 ; 
         FIG. 7  is an explanatory drawing showing configuration examples of a memory and a storage within the content distribution server of  FIG. 4 ; 
         FIGS. 8( a )-8( b )  are data tables showing an example of user profile information managed by a user profile generator of  FIG. 6 ; 
         FIGS. 9( a )-9( b )  are data tables showing item examples of user authentication information and device authentication information of  FIG. 4 ; 
         FIG. 10  is a flowchart showing an example of processes performed by the wireless terminal and television receiver within the network terminal system of  FIG. 1 ; 
         FIGS. 11( a )-11( b )  are explanatory drawings showing a display example of the wireless terminal within the network terminal system of  FIG. 1 ; 
         FIG. 12  is a flowchart showing an example of processes performed by the wireless terminal, the television receiver and the content distribution server within the network terminal system of  FIG. 1 ; 
         FIGS. 13( a )-13( b )  are explanatory drawings showing a display example of the operation screen of the wireless terminal within the network terminal system of  FIG. 1 ; 
         FIG. 14  is an explanatory drawing showing a display example of an App menu screen of the television receiver within the network terminal system of  FIG. 1 ; 
         FIG. 15  is an explanatory drawing showing a display example of a content list display screen of the television receiver within the network terminal system of  FIG. 1 ; 
         FIG. 16  is an explanatory drawing showing a display example of a content detail display screen of the television receiver within the network terminal system of  FIG. 1 ; 
         FIG. 17  is a flowchart showing an example of processes performed by the wireless terminals, the television receiver and the content distribution server within the network terminal system of  FIG. 1 ; 
         FIG. 18  is an explanatory drawing showing a display example of a login completed notification screen displayed on the television receiver; 
         FIG. 19  is an explanatory drawing showing a display example of an aggregated content list display screen displayed on the television receiver; 
         FIG. 20  is an explanatory drawing showing a display example of a sort process selection screen displayed on the television receiver; 
         FIG. 21  is an explanatory drawing showing a display example of a logout notification screen displayed on the television receiver; 
         FIG. 22  is a flowchart showing an example of processes in a network terminal system according to a second embodiment; 
         FIG. 23  is an explanatory drawing showing an example of aggregated login information generated in a process of step S 2201  of  FIG. 22 ; 
         FIG. 24  is an explanatory drawing showing a display example of an aggregated service display screen in a process of step S 2207  of  FIG. 22 ; 
         FIG. 25  is an explanatory drawing showing another display example of an aggregated service display screen in the process of step S 2207  of  FIG. 22 ; 
         FIG. 26  is a flowchart showing an example of actions in the network terminal system according to a third embodiment; 
         FIG. 27  is an explanatory drawing showing a display example of a billing menu display screen in a process of step S 2603  of  FIG. 26 ; 
         FIGS. 28( a )-28( b )  are explanatory drawings showing an example of an operation screen in processes of steps S 2606  and S 2607  of  FIG. 26 ; 
         FIGS. 29( a )-29( d )  are explanatory drawings showing an example of default settings information of the wireless terminal according to a fourth embodiment; 
         FIGS. 30( a )-30( b )  are explanatory drawings showing an example of a default settings screen displayed on the wireless terminal; 
         FIG. 31  is a flowchart showing an example of processes in a network terminal system according to a fifth embodiment; and 
         FIG. 32  is an explanatory drawing showing an example of a network connection confirmation screen in a process of step  3104  of  FIG. 31 . 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     In the embodiments described below, the invention will be described in a plurality of sections or embodiments if necessary for the sake of convenience. However, these sections or embodiments are not irrelevant to each other unless otherwise clearly specified, and one section or embodiment partially or entirely corresponds to another section or embodiment as a modification, detailed or supplementary description or the like. 
     In addition, in the embodiments described below, when referring to the number of a component (including number of pieces, numerical value, amount and range), the number is not limited to a specified number and may be less than or greater than this number, unless otherwise clearly specified or unless it is obvious from the context that the number is limited to the specified number in principle. 
     Further, in the embodiments described below, it goes without saying that each component (including an element step) is not indispensable unless otherwise clearly specified or unless it is obvious from the context that the component is indispensable in principle. 
     Likewise, in the embodiments described below, when referring to a shape, a positional relation or the like of a component, a substantially approximate shape, a similar shape or the like is included unless otherwise clearly specified or unless it is obvious from the context that the shape, the positional relation or the like of the component differs in principle. The same applies to the above-described numerical value and range. 
     In addition, in all of the drawings that describe the embodiments, the same members are generally denoted by the same reference symbols, and redundant descriptions are omitted as appropriate. 
     Hereinafter, embodiments will be described in detail. 
     (First Embodiment) 
     The first embodiment will describe a case where a service (hereinafter referred to as IPTV service) for distributing content such as video images, audio and text information via the internet is used by way of example; however, the present embodiment is not limited to such a case. 
     &lt;Regarding IPTV Service&gt; 
     The IPTV service is roughly classified into three modes of services that include streaming, download and progressive download. In streaming, items of content data are successively distributed from a server to a client, and the video image, audio or the like obtained through the data received by the client is played back such that the video image, audio or the like is presented to the user. Thus, streaming is characterized in that the user can view the content on a substantially real-time basis when the network has a sufficiently wide band. 
     In download, the client obtains and accumulates all items of content data from the server in advance, and after accumulation is completed, playback for viewing is performed. Thus, download is characterized in that the user can receive content distribution even if the network does not have a sufficiently wide band and can view the content several times at desired timings when the content does not need to be viewed on a real-time basis by completing distribution of the content data and accumulating the data in advance. 
     In addition, in progressive download which is a service between these two services, items of content accumulated in the terminal can be successively viewed before distribution of all items of content is completed. In this manner, it is not always necessary to wait for the accumulation to complete, so that it is possible to provide an advantage in which the accumulation time is shortened even if the network does not have a sufficiently wide band. In addition, it is possible to provide an advantage in which the user can view the content several times at desired timings after the accumulation is completed. 
     In the content distribution service including the IPTV service, a compensation fee is usually charged by a service provider to the user for receiving the distribution service. At this time, the user is registered as an authorized user in advance, and various pieces of information such as a password, name and street address are managed by using an identifier such as an ID as a clue. Note that the password may be biometric information such as a fingerprint. 
     In a case where a for-pay content is distributed, it is possible to record billing information at the time of accumulation or viewing, and it is confirmed that payment of the compensation fee is possible through a separately designated payment method. 
     At a stage of using the distribution service, the identifier such as an ID (IDentification) of registration information and the password needs to be verified with management information in order to receive user authentication and make the service available. The authenticated authorized user is usually provided with a content viewing portal screen for selecting and searching the content to be distributed and for selecting other services such as information distribution. 
     In addition, device authentication is usually performed via a communication prior to the distribution service in order to confirm whether or not the device used by the user is a device recommended by the service provider, confirm whether or not the program received by the distribution service operating in the device is a recommended program, or the like. In this manner, illegal behavior such as unauthorized copying, transferring and modifying which violate laws such as the Copyright Act and unauthorized usage of the content are prevented. 
     At this time, the content may be encrypted in advance by a common key cryptosystem, and a key for decrypting the encrypted key may be associated with the received content and be separately maintained such that the encrypted key can be decrypted by an authenticated authorized user, an authenticated authorized connection device or an authorized connection device in which an authorized user is authenticated. 
     In addition, a public key and a private key may be prepared on the connection device side or the service provider with utilizing a public key cryptosystem. The private key may be sent to the connection device during user registration and be utilized for encrypting and decrypting keys in each of the service provider and connection device. 
     Generally, these keys for decrypting are recorded together with playback conditions such as an expiration date of the content, number of times the content can be played back and the user and device capable of playing back the content. Hereinafter, the key for encrypting will be referred to as an encryption key, and the key for decrypting will be referred to as a decryption key. 
     In this manner, the IPTV service provider serving as a content or service provider associates user authentication, device authentication and decryption keys to one another in order to safely provide the content distribution service and the like to users and reliably charge the fee. 
     Thereafter, the user receives distribution of the desired content and correctly receives services such as content playback. Further, in this regard, there may be a case where the user is allowed to maintain the content associated so as to comply with a right for playback corresponding to the copyright of the content. 
     The user performs playback of the content on a predetermined device with utilizing the content and decryption key obtained in such a manner; however, this is performed under the presumption that the same apparatus is used by the same user. 
     On the other hand, in a case where the same user possesses a plurality of apparatuses and wishes to play back the same content on a different apparatus, there is an inconvenience in that a fee for the same content is charged again. 
     For this reason, there is a service that allows the content to be played back on a number of devices within a range permitted by the service provider if the right for playback is held by the same user. 
     In addition, there is also a service in which a function of an application software purchased and downloaded as in the case of the content is acquired by running the application software in the device. As in the case of the content, there is also a service that allows an authenticated authorized user to download an application to a number of devices within a range permitted by the service provider if the right for download is held by the same user. 
     &lt;Configuration Example of Network Terminal System&gt; 
       FIG. 1  is a block diagram showing a configuration example of a network terminal system according to the first embodiment. 
     As shown in  FIG. 1 , the network terminal system includes, for example, a television receiver  101 , a wireless terminal  102 , a wireless terminal  103 , a wireless router  104 , an external network  105  and a content distribution server  106 . 
       FIG. 1  shows an example in which each user of the wireless terminal  102  and wireless terminal  103  views a television program on the television receiver  101  at home, in a store or the like. Each of the wireless terminals  102  and  103  is an information terminal and is constituted by a mobile communication terminal such as a mobile telephone. 
     At this time, it is assumed that the network terminal system shown in  FIG. 1  is temporarily constructed when, for example, the user of the wireless terminal  103  visits the house of the user of the wireless terminal  102 . Note that  FIG. 1  shows an example in which the two wireless terminals  102  and  103  are utilized; however, the number of wireless terminals is not limited to this number and may be three or more. 
     The wireless router  104  comprises a wireless LAN (Local Area Network) function such as Wi-Fi (registered trademark) and can be connected to the external network  105  via a communication line. The communication line such as wireless LAN is a first network, and the external network  105  is a second network. 
     In addition, the wireless router  104  is connected to the television receiver  101 , the wireless terminal  102 , the wireless terminal  103  and the external network  105 . The television receiver  101 , the wireless terminal  102  and the wireless terminal  103  can obtain information via an internet network. 
     In addition, the wireless router  104  is connected to the television receiver  101  via wired or wireless LAN and is connected to the wireless terminal  102  or the wireless terminal  103  via wireless LAN. Here, Wi-Fi refers to wireless LAN standards defined in “IEEE 802.11a/IEEE 802.11b” standards by the IEEE (Institute of Electrical and Electronics Engineers of U.S.A.). 
     The content distribution server  106  which is a content distribution apparatus is a content management apparatus configured to accumulate content such as movies and audio and distribute the content in response to a request of the television receiver  101 , the wireless terminal  102  or the wireless terminal  103  connected to the network. 
     The content distribution server  106  is connected to the external network  105 . The television receiver  101 , the wireless terminal  102  and the wireless terminal  103  can send and receive information to and from the content distribution server  106  via the wireless router  104  and can receive information regarding the content such as the content itself and the key for decrypting the encrypted content. 
     In addition, each of the wireless terminals  102  and  103  is connected to a communication network via a base station  108  by using the mobile communication network, so that the wireless terminals can send and receive information and can receive the content via the external network connected to the communication network. 
     &lt;Hardware Configuration of Television Receiver&gt; 
     Next, a configuration of the television receiver  101  will be described. 
       FIG. 2  is an explanatory drawing showing a configuration example of the television receiver  101  within the network terminal system of  FIG. 1 . 
     The television receiver  101  which is the display apparatus is connected to an antenna  201 . The television receiver  101  includes a tuner/demodulator  202 , a station selection controller  203 , a signal separator  204 , an audio decoder  205 , a speaker  206 , an audio output unit  207 , a video decoder  208 , a superimposing unit  209 , a display  210 , a video output unit  211 , a communication I/F (interface)  212 , an input unit  213 , a controller  214 , a memory  215 , a storage  216 , a digital I/F  217  and the like. Each of these function blocks is connected to one another via a bus  218 . 
     Various operation functions of the television receiver  101  are achieved by application programs. The application programs are stored in the storage  216 , and the controller  214  applies these programs from the storage  216  to the memory  215 . Further, the controller  214  executes the application programs to achieve various functions. 
     In the description below, the various functions achieved by the controller  214  executing the application programs will be described as being achieved mainly by “various program function units” applied to the memory  215  for the sake of clarity. 
     The application programs may be stored in the storage  216  in advance by the time of shipping the television receiver  101 . Alternatively, the application programs may be stored in an optical medium such as a CD (Compact Disk) or a DVD (Digital Versatile Disk) or a medium such as a semiconductor memory and may be installed in the television receiver  101  via a medium connection unit (not shown). 
     In addition, the application programs may be downloaded and installed from the external network  105  via the communication I/F  212  and wireless router  104 . Note that the various functions of the above-described application programs can also be achieved by hardware serving as processors having the same functions. In a case where the application programs are achieved by the hardware, each function is achieved mainly by the corresponding processor. 
     The input unit  213  is an input device configured to accept the user&#39;s input operation of the television receiver  101  and corresponds to a remote controller, a keyboard and a pointing device such as a mouse. 
     The controller  214  receives the user&#39;s input operation via the input unit  213  and controls each processor such as the station selection controller  203 , the signal separator  204 , the superimposing unit  209 , the memory  215  which is the various program function unit, the storage  216 , the communication I/F  212  and the digital I/F  217 . 
     The tuner/demodulator  202  is controlled by the station selection controller  203  and is tuned to a channel of the desired service. A desired digital broadcast signal received from a broadcast station  107  of  FIG. 1  via the antenna  201  is selected and demodulated to generate a transport stream. 
     The station selection controller  203  receives an instruction for selecting the service via the input unit  213  and controls the tuner/demodulator  202  such that the channel is switched to the selected channel. In addition, according to an instruction from the various program function unit, the station selection controller  203  controls the tuner/demodulator  202  such that the service is switched to a service (channel number) currently broadcasting an event (program) and to a broadcast presentation unit within this service. 
     The communication I/F  212  is connected to the wireless router  104  via wired or wireless LAN. The communication I/F  212  sends and receives various pieces of information to and from the wireless terminal  102  or the wireless terminal  103  via the wireless router  104 . 
     In addition, the communication I/F  212  can send and receive various pieces of information to and from another apparatus connected to the external network  105  via the wireless router  104 . For example, content streams including video/audio streams can be received in a format such as IP broadcast or video-on-demand from the content distribution server  106  and the like connected to the external network  105 . The controller  214  and the communication I/F  212  become information controllers, content controllers and aggregated content generators. 
     Video/audio streams and application programs can be downloaded from the content distribution server  106  and the like connected to the external network  105 . The downloaded data or information is stored in, for example, the storage  216 . 
     In addition to or instead of the function for communicating with the wireless router  104 , it is possible to directly communicated with an external device by a technique such as wireless LAN including Wi-Fi, IrDA (registered trademark), Bluetooth (registered trademark) or NFC (Near Field Communication), without the wireless router  104  interposed therebetween. 
     The communication I/F  212  may be provided with a chip configured to perform each communication scheme. Alternatively, the communication I/F  212  may be provided with a single chip configured to handle a plurality of communication schemes. 
     Hereinafter, an example in which the communication I/F  212  sends and receives various pieces of information to and from the wireless terminal  102  or the wireless terminal  103  via the wireless router  104  will be described; however, the communication I/F  212  may directly send and receive various pieces of information without the wireless router  104  interposed therebetween as described above. 
     The signal separator  204  separates the transport streams obtained by the tuner/demodulator  202  and the content streams obtained via the communication I/F  212  into video data, audio data, subtitle text data, program information and the like according to each type. 
     In addition, the signal separator  204  includes a function for obtaining program information such as program arrangement information (SI) and sending the program information to other processing blocks. In a case where a data send request is received from another processor, the signal separator  204  sends the designated data to the requesting source. 
     The audio decoder  205  decodes audio data separated by the signal separator  204 . Audio information decoded by the audio decoder  205  is outputted from the speaker  206 . The audio information decoded by the audio decoder  205  may be outputted from the audio output unit  207  to an external device. 
     The video decoder  208  decodes the video data separated by the signal separator  204 . Video information decoded by the video decoder  208  is sent to the superimposing unit  209 . 
     The superimposing unit  209  superimposes an EPG (Electronic Program Guide) image created by the various program function unit, an OSD (On Screen Display) image, images generated from various pieces of information (such as subtitle information, superimposed subtitles and data of data broadcast) separated by the signal separator  204 , and the like on the decoded video information sent from the video decoder  208 . The various pieces of information are, for example, the subtitle information, superimposed subtitles or data of data broadcast. 
     In addition, the superimposing unit  209  synthesizes a browser display screen created by a browser engine  502  described below and a video signal or selectively switches between the browser display screen and the video signal. The video information having passed through the superimposing unit  209  is displayed on the display  210  which is the first display. 
     The display  210  is constituted by a television, a personal computer display, a liquid crystal panel or the like, and displays broadcasted/distributed video images, a UI for performing various operations, a web browser, images stored in the storage  216  or the like. 
     The video information having passed through the superimposing unit  209  may be outputted from the video output unit  211  to an external device. The image or video image to be displayed may be an image generated by an application program or may be an image or video image of the content received via the tuner/demodulator  202 . Alternatively, the image or video image may be an image or video image received from a server on the external network  105  via the communication I/F  212  or may be an image or video image received from the wireless terminal  102  or the wireless terminal  103  via the communication I/F  212 . 
     In addition, the transport streams of a predetermined program may be separated by the signal separator  204 , and the digital I/F  217  configured to output a video image or an audio without decoding the video image or the audio may be provided. 
     The storage  216  stores the application programs and various pieces of information created by the application programs. In addition, the content such as video/audio stream can be stored from a signal received by the tuner/demodulator  202  or the communication I/F  212 . The function units of the application programs stored in the storage  216  are applied to the memory  215  is applied by controls of the controller  214 . 
     The image or video image to be displayed on the display  210  can be any one of an image generated by the application program, an images or video image of the content received via the tuner/demodulator  202 , an image or video image received from the content distribution server  106  on the external network  105  via the communication I/F  212 , and an image or video images received from the wireless terminals  102  and  103  via the communication I/F  212 . 
     Here, an example using the television receiver will be described; however, a configuration using a recorder in which the display and speaker are omitted may be applied such that similar video images and audio are presented through the externally connected television receiver, display or speaker. 
     In addition, the television receiver  101  can be replaced with an STB (Set-Top Box), a recorder or the like, and in this case, the speaker  206  and the display  210  can be omitted from the configuration of the television receiver of  FIG. 2 . 
     In addition, the present embodiment can also be applied to a monitor apparatus, a large tablet terminal, an interactive whiteboard or the like comprising the above-described communication I/F. In this case, the antenna  201 , the tuner/demodulator  202 , the station selection controller  203  and the signal separator  204  can be omitted from the configuration of the television receiver of  FIG. 2 . 
     &lt;Hardware Configuration of Wireless Terminal&gt; 
     Next, a configuration of the wireless terminal  102  will be described. 
       FIG. 3  is an explanatory drawing showing a configuration example of the wireless terminal  102  within the network terminal system of  FIG. 1 . 
     In  FIG. 3 , the configuration of the wireless terminal  102  will be described; however, a configuration of each unit of the wireless terminal  103  is the same as those of the wireless terminal  102 , and thus, redundant descriptions will be omitted. 
     The wireless terminal  102  includes a tuner/demodulator  301 , a signal separator  302 , a memory  303 , a storage  304 , an acceleration sensor  305 , a geomagnetic sensor  306 , a controller  307 , a display  308 , a communication I/F  309 , a mobile communication I/F  310 , an input unit  311 , a GPS receiver  312  and a gyro sensor  313 . These function blocks are connected to one another via a bus  314 . 
     The wireless terminal  102  stores application programs in the storage  304 . The controller  307  applies the application programs from the storage  304  to the memory  303  and executes the application programs to achieve various functions. 
     In the description below, the various functions achieved by the controller  307  executing the application programs will be described as being achieved mainly by “various program function units” applied to the memory  303  for the sake of clarity. 
     The application programs may be stored in the storage  304  in advance by the time of shipping the wireless terminal  102 . Alternatively, the application programs may be stored in an optical medium such as a CD (Compact Disk) or a DVD (Digital Versatile Disk) or a medium such as a semiconductor memory and may be installed in the wireless terminal  102  via a medium connection unit (not shown). 
     In addition, the application programs may be downloaded and installed from the external network  105  via the communication I/F  309  and wireless router  104 . Alternatively, the application programs may be downloaded and installed from the base station  108  which is a distribution source via the mobile communication I/F  310 . 
     In addition, a personal computer having application programs obtained via the network can be connected to the wireless terminal  102  via an external device connection I/F (not shown), so that the application programs can be moved or copied from the personal computer and be installed to the wireless terminal  102 . 
     Note that the various functions of the application programs can also be achieved by hardware serving as processors having the same functions. In the case where the application programs are achieved by the hardware, each function is achieved mainly by the corresponding processor. 
     The tuner/demodulator  301  and the signal separator  302  respectively have the same functions as those of the tuner/demodulator  202  and signal separator  204  shown in  FIG. 2 . These functions have already been described, and thus, redundant descriptions will be omitted. 
     The communication I/F  309  serving as a transmitter and receiver sends and receives various pieces of information to and from the communication I/F  212  of the television receiver  101  of  FIG. 2  via the wireless router  104  of  FIG. 1  by wireless LAN. In addition, the communication I/F  309  is connected to the external network  105  via the wireless router  104  and sends and receives various pieces of information to and from the content distribution server  106  and the like on the external network  105 . 
     For example, content streams including video/audio streams can be received in a format such as IP broadcast or video-on-demand from the content distribution server  106  and the like connected to the external network  105  as in the above-described television receiver  101 . 
     In addition, video streams and application programs can be downloaded from the content distribution server  106  and the like connected to the external network  105 . The downloaded data or information is stored in, for example, the storage  304 . 
     In addition to or instead of the function for communicating with the wireless router  104 , it is possible to directly communicate with the television receiver  101  or another device by a technique such as wireless LAN including Wi-Fi, IrDA, Bluetooth or NFC, without the wireless router  104  interposed therebetween. 
     The communication I/F  309  may be provided with a chip configured to perform each communication scheme. Alternatively, the communication I/F  309  may be provided with a single chip configured to handle a plurality of communication schemes. 
     The mobile communication I/F  310  is connected to the communication network via the base station  108  by using a mobile communication network such as a third generation mobile communication system (hereinafter referred to as “3G”) or an LTE (Long Term Evolution) scheme and can send and receive information to and from the server on the communication network. 
     The third generation mobile communication system includes, for example, a GSM (Global System for Mobile Communications) scheme, a W-CDMA (Wideband Code Division Multiple Access) scheme, a CDMA2000 scheme or a UMTS (Universal Mobile Telecommunications System) scheme. 
     The controller  307  receives the user&#39;s operation request via the input unit  311  and controls the signal separator  302 , the memory  303  which is the various program function unit, the display  308  and the communication I/F  309 . 
     In addition, the controller  307  can obtain various pieces of information, content or application programs from the external network  105  via the communication I/F  309  and wireless router  104  or from the communication network via the mobile communication I/F  310  and base station  108 , and has a function for passing the various pieces of information, the content or the application programs to the various program function unit. 
     The storage  304  stores the application programs and various pieces of information created by the application programs. In addition, the storage  304  can store content such as video/audio streams from signals received from the tuner/demodulator  301 , the communication I/F  309  or the mobile communication I/F  310 . 
     The function units of the application programs stored in the storage  304  are applied to the memory  303  by controls of the controller  307 . The display  308  which is a second display displays images and video images stored in the storage  304 , broadcasted/distributed video images, a UI for performing various operations, a browser or the like. The display  308  may be integrally formed with a touch panel described below or the like. 
     The image or video image to be displayed is an image generated by an application program, an image or video image of the content received via the tuner/demodulator  301 , an image or video image received from the content distribution server  106  on the external network  105  via the communication I/F  309 , or the like. Alternatively, the image or video image to be displayed can be an image or video image received from the television receiver  101  via the communication I/F  309 , an image or video image distributed from the server on the communication network via the mobile communication I/F  310 , or the like. 
     The input unit  311  is an input device configured to accept the user&#39;s input operation of the wireless terminal  102  and can utilize a physical button, a touch panel or the like. Hereinafter, an example in which the touch panel is used will be described; however, the various operations may be configured so as to utilize a physical button. 
     An object or the like such as an icon can be freely moved by a drag operation or a flick operation utilizing the touch panel. The drag operation is an operation in which a selected object on the touch panel is moved in a state where the object is continuously touched by a finger. The flick operation is an operation in which the selected object on the touch panel is moved by moving the finger so as to flick the screen. 
     In addition, the object such as the icon can be activated or the screen can be switched to another screen by performing an operation (tap operation) in which an object is tapped once by the finger or an operation (double tap operation) in which an object is tapped twice. Hereinafter, each operation performed on the above-described touch panel will be referred to as a drag operation, a flick operation and a tap operation. 
     The acceleration sensor  305  measures an acceleration applied to the wireless terminal  102 . The controller  307  measures, for example, an acceleration of gravity by the acceleration sensor  305 . By measuring the acceleration of gravity, an upper side of the wireless terminal  102  can be determined. 
     As a result, the screen displayed on the display  308  can be displayed such that an upper side of the screen is aligned with the upper side measured by the acceleration sensor  305 , and thus, the screen can be displayed according to how the user is holding the wireless terminal  102 . 
     The geomagnetic sensor  306  measures geomagnetism by using a plurality of magnetic sensors or the like. The GPS receiver  312  receives signals sent from a plurality of satellites by using GPS (Global Positioning System). 
     The controller  307  can calculate position information of the wireless terminal  102  based on the signals received by the GPS receiver  312 . The gyro sensor  313  measures an angular velocity of the wireless terminal  102  generated in a case where the user moves the wireless terminal  102 . 
     &lt;Hardware Configuration of Content Distribution Server&gt; 
       FIG. 4  is an explanatory drawing showing a configuration example of the content distribution server  106  within the network terminal system of  FIG. 1 . 
     The content distribution server  106  is constituted by a communication I/F  401 , a controller  402 , a memory  403  and a storage  404 . These function blocks are connected to one another via a bus  408 . 
     The content distribution server  106  stores application programs in the storage  404 . The controller  402  applies the application programs from the storage  404  to the memory  403  and executes the application programs to achieve various functions. 
     In the description below, the various functions achieved by the controller  402  executing the application programs will be described as being achieved mainly by “various program function units” applied to the memory  403  for the sake of clarity. 
     The communication I/F  401  is connected to the external network  105 , is connected to the wireless router  104  via the external network  105 , and sends and receives various pieces of information to and from the communication I/F  212  of the television receiver  101  and the communication I/F  309  of the wireless terminal  102  or wireless terminal  103 . 
     In addition, the communication I/F  401  can send and receive various pieces of information to and from the mobile communication I/F  310  of the wireless terminal  102  or wireless terminal  103  from the communication network via the base station  108 . 
     The controller  402  controls the communication I/F  401 , the memory  403  and the storage  404 . In addition, the controller  402  also has a function for passing content accumulated in a content  405  of the storage  404  to the television receiver  101 , the wireless terminal  102  or the wireless terminal  103  via the communication I/F  401 , the external network  105  or the base station  108 . 
     The storage  404  stores the application programs and various pieces of information created by the application programs. In addition, the storage  404  also has a function configured to accumulate the content  405 , device authentication information  406 , user authentication information  407  and the like. 
     The function units of the application programs stored in the storage  404  are applied to the memory  403  which is the various program function unit by controls of the controller  402 . 
     &lt;Software Configuration Example of Television Receiver&gt; 
       FIG. 5  is an explanatory drawing showing configuration examples of the memory  215  and the storage  216  within the television receiver  101  of  FIG. 2 . 
     In  FIG. 5 , the storage  216  stores a connection device authentication program  511 , a browser program  512 , a content playback program  513 , various application programs  514 , an account management program  515  and a content/application synchronization processing program  516 . 
     These programs are applied to the memory  215  by the controller  214 , and the controller  214  executes the applied programs to achieve functions of a browser engine  502 , a connection device authentication unit  501 , a content player  507 , a various application unit  508 , an account manager  509  and a content/application synchronization processor  510 . 
     The connection device authentication program  511 , the browser program  512 , the content playback program  513 , the various application programs  514 , the account management program  515  and the content/application synchronization processing program  516  are stored in the storage  216  by the time of shipping the product. Alternatively, these programs may be downloaded via the communication I/F  212 . 
     In the description below, the various functions achieved by the controller  214  executing these programs will be described as being achieved mainly by each function unit in the memory  215  for the sake of clarity. 
     The browser engine  502  is constituted by each function block of an HTML parser  503 , a database generator  504 , a renderer  505  and an image processor  506 . 
     The HTML parser  503  analyzes a logical structure of HTML (HyperText Markup Language) data obtained via the controller  214 . In addition, the HTML parser  503  renders the obtained HTML data and converts the HTML data into internal data to be used in the television receiver  101 . 
     The database generator  504  generates a database related to this HTML data structure. The renderer  505  generates a layout structure including information of an expression format determined by each tag based on the database and generates a browser display screen matching the data in which size, position and image based on this layout structure are imported. 
     The image processor  506  converts the obtained image file into image data of a bitmap format or the like based on image file information such as an image file name and an arrangement of an image file designated by an image tag in the HTML data. 
     The authentication information such as the user ID and the password obtained from various data in the storage  216  of the television receiver  101  is compared with the authentication information sent from a connection device authentication unit  601  of the wireless terminal  102  or wireless terminal  103  by the connection device authentication unit  501 . If the pieces of authentication information match, the connection device authentication unit  501  permits connection of the connection device authentication unit  601  of the wireless terminal  102 . On the other hand, if the pieces of authentication information do not match, the connection device authentication unit  501  does not authenticate the connection of the connection device authentication unit  601  of the wireless terminal  102 . 
     The authentication information stored in the various data of the storage  216  of the television receiver  101  is entered by the user with utilizing the input unit  213  or is set in advance before the time of shipping the television receiver  101  from a factory. 
     In addition, the above-described authentication information can be displayed on the display  210  by the user&#39;s operation or can be confirmed by the user based on documents and the like attached to the product when the user purchased the television receiver  101 . Further, a username and MAC address of the wireless terminal  102  or wireless terminal  103  may be stored in the storage  216  of the television receiver  101 , a non-volatile memory (not shown) or the like as the authentication information of the connection device. 
     The above is an example of an authentication method, and in a case where, for example, the television receiver  101  is connected to the wireless terminal  102  or the wireless terminal  103  via wireless LAN, an authentication/encryption method which uses an SSID (Service Set Identifier) and a WEP (Wired Equivalent Privacy) key or a WPS (Wi-Fi Protected Setup) key can be utilized. The authentication method, the encryption method for encrypting information sent and received when authentication succeeds, and the like may use a known technique and are not limited to specific methods. 
     In addition, in a case where the wireless terminal is operated such that the distribution of the content for viewing is received from the content server  106  by the television receiver  101 , the connection device authentication unit  501  has a function configured to send the authentication information stored in the various data to a user manager  701  of the content distribution server  106  via the communication I/F  212  and wireless router  104 . 
     At this time, the device authentication information sent to the content distribution server  106  is associated with user information of user profile information generated by a user profile generator  609  of the wireless terminal  102  or wireless terminal  103 . In addition, the device authentication information can be separately managed as information recognizable by the content distribution server  106 . 
     The content player  507  receives the content data and content information of a movie, TV drama or the like distributed from the content distribution server  106  via the external network  105  and plays back the successively received video images, audio and the like to present to the user. 
     Here, a case of distribution and playback of the content by streaming will be described; however, as described below, there may be a download service in which the entire content data is obtained from the server and accumulated in advance and the content is played back for viewing after accumulation is completed. In this case, the content data is stored in a content  517  of the storage  216 . 
     Information of a playback stop position of the content can be stored as resume information in the various data of the storage  216 . In a case where playback of the same content is resumed by the same user, data of the playback stop position can be obtained from the resume information and be used as a playback start position. The resume information is set per user by referring to the user profile information obtained from the wireless terminals  102  and  103 . 
     The various application unit  508  indicates applications such as the browser engine  502  and the content player  507  shown in  FIG. 5  as well as applications downloaded from the content distribution server  106  according to the user&#39;s preference. Each application receives the user&#39;s operation from the input unit  213  and is activated by a tap operation performed on an application activation icon displayed on the display  210 . 
     After authentication of the wireless terminal  102  or wireless terminal  103  by the connection device authentication unit  501  is completed, the account manager  509  sets the authenticated wireless terminal  102  or the wireless terminal  103  as an authenticated user account. 
     In addition, when the user profile information generated by the wireless terminal  102  or the wireless terminal  103  is obtained, the user account and the user profile are associated with the corresponding user ID based on the user profile information, and are registered and managed therein. 
     In addition, the account manager  509  can simultaneously accept and independently manage a plurality of user accounts. In a case where simultaneous actions are available, operation by each user account is permitted, and in a case where simultaneous actions are not available and an exclusive action is necessary, the user information of the wireless terminal currently used by a user is sent to the wireless terminal used by the next user, so that the right for usage of the television receiver  101  can be transferred or information regarding the remaining usage time or the like can be requested. 
     The content/application synchronization processor  510  refers to the user profile of each wireless terminal, compares the type of application downloaded to the wireless terminal  102  or the wireless terminal  103  and the type of application downloaded to the television receiver  101 , and confirms for consistency based on device type information described below. 
     Further, if the applications between the wireless terminal and the television receiver do not match, the applications of the wireless terminal and the television receiver can be synchronized by downloading the absent application. 
     In addition, applications regarding the downloaded content of the wireless terminal and the television receiver can be synchronized by downloading as in the above-described case. Further, in a case where an application or content is downloaded, a message for confirmation may be displayed on the display  210  such that whether or not to download the application or the content can be selected by the input unit  213 . 
     &lt;Software Configuration Example of Wireless Terminal&gt; 
       FIG. 6  is an explanatory drawing showing a configuration example of the memory  303  and the storage  304  within the wireless terminals  102  and  103  of  FIG. 3 . 
     As shown in  FIG. 6 , the storage  304  stores a device authentication program  610 , a browser program  611 , a content playback program  612 , various application programs  613  and a user profile generation program  614 . 
     These programs are applied to the memory  303  by the controller  307 , and the controller  307  executes the programs to achieve functions of the connection device authentication unit  601 , a browser engine  602 , a content player  607 , a various application unit  608  and the user profile generator  609 . 
     The device authentication program  610 , the browser program  611 , the content playback program  612 , the various application programs  613  and the user profile generation program  614  are stored in the storage  304  by the time of shipping the product. Alternatively, these programs may be downloaded via the communication I/F  309  or mobile communication I/F  310 . 
     In the description below, the various functions achieved by the controller  307  executing these programs will be described as being achieved mainly by the program function unit in the memory  303  for the sake of clarity. 
     As in the browser engine  502  of the television receiver  101 , the browser engine  602  is constituted by each function block of an HTML parser  603 , a database generator  604 , a renderer  605  and an image processor  606 . 
     The HTML parser  603 , the database generator  604 , the renderer  605  and the image processor  606  are the same as those of the browser engine  502  of  FIG. 5 , and thus, redundant descriptions will be omitted. 
     In order to receive authentication from the television receiver  101 , the connection device authentication unit  601  sends the authentication information of a connection device entered by the user utilizing the input unit  311  and stored in the various data to the connection device authentication unit  501  of the television receiver  101  via the communication I/F  309  and wireless router  104 . In a case where a second or subsequent authentication is performed, entering of the authentication information can be skipped by referring to the authentication information of the connection device stored in the various data of the storage  304 . 
     In addition, the connection device authentication unit  601  has a function for sending the authentication information stored in the various data as the authentication information of a content distribution destination to the user manager  701  of the content distribution server  106  described below via the communication I/F  309  or mobile communication I/F  310 . 
     The pieces of authentication information can be managed separately from the user profile information as information associated with the user information of the user profile information generated by the user profile generator  609  and recognizable by the content distribution server  106 . 
     A content player  907  receives the content data and the content information of the movie, TV drama or the like distributed from the content distribution server  106  and the like via the external network  105  or mobile communication I/F  310 , and plays back the successively received video images, audio and the like to present to the user. 
     Here, a case of distribution and playback of the content by streaming will be described; however, as in the embodiment described below, there may be a download service in which the entire content data is obtained from a server and accumulated in advance, and the content is played back for viewing after accumulation is completed. In this case, the content data is stored in the storage  304  as the content  615 . 
     In addition, information of a playback stop position of the content can be stored in the various data of the storage  304  as resume information. In a case where the same content is resumed, data of the playback stop position can be obtained from the resume information and be used as a playback start position. The resume information can be stored in the user profile information. 
     The various application unit  608  indicates applications such as the browser engine  602  and the content player  607  as well as applications downloaded from the content distribution server  106  according to the user&#39;s preference. 
     Each application receives the user&#39;s operation from the input unit  311  and is activated by a tap operation performed on an application activation icon displayed on the display  210 . 
     The user profile generator  609  has a function for generating the user profile information including the user authentication information for receiving authentication from the connection device, information such as a menu set according to the user&#39;s preference, and information such as the title of the application installed before purchase or obtained by download purchasing or the like. Setting states changed by the user and information of a newly purchased application or the like are updated to the most recent states. 
     &lt;Software Configuration Example of Server&gt; 
       FIG. 7  is an explanatory drawing showing configuration examples of the memory  403  and the storage  404  within the content distribution server  106  of  FIG. 4 . 
     As shown in  FIG. 7 , the storage  404  stores a user management program  704 , a content management program  705  and a content distribution program  706 . 
     These programs are applied to the memory  403  by the controller  402 , and the controller  402  executes the programs to achieve functions of the user manager  701 , a content manager  702  and a content distributor  703 . 
     The user management program  704 , the content management program  705  and the content distribution program  706  can be stored in the storage  404  or the like in advance. In the description below, each of the various functions achieved by the controller  402  according to these programs will be described as being achieved mainly by each function unit in the memory  403  for the sake of clarity. 
     The user manager  701  manages the user authentication information for authenticating each user, the device authentication information for authenticating the device in the possession of the user, and the like. The user authentication information and the device authentication information are respectively stored in the user authentication information  407  and the device authentication information  406  of the storage  404 . 
     The user manager  701  obtains the device authentication information of the device used by the user and the user authentication information of the username and password entered by the user of the wireless terminal  102  or television receiver  101  utilizing the input unit  213  or the input unit  311  via the communication I/F  401  and external network  105 . 
     Further, the user manager  701  compares the user authentication information stored in advance to confirm whether or not the user is an authorized and registered user and whether or not the number of devices of the same user is maintained within the number of devices permitted by the service provider. The user manager  701  has a function for returning error information if both pieces of user authentication information do not match or the number of devices exceeds the range permitted. 
     The content manager  702  manages the content or application data and content information or application information constituted by the information attached to the content or application data. 
     The content information of the content such as a moving image records a content ID which is a management number for uniquely identifying the content, a content format, content description information, content data, a target apparatus suitable for the size or display of the content, a fee for the content distribution service or for playing back and viewing the distributed content, a viewing period and the like. The content description information includes a genre title, cast, plot and the like. 
     In addition, the application information records an application ID which is a management number for uniquely identifying the application, application description information, a target of an apparatus suitable for a size or display of the application, and a fee charged by downloading the application. 
     Note that the various pieces of information may be recorded by utilizing a recording medium such as a hard disk and be read into the memory managed by the content manager  702 . In addition, the content or application data and data explaining the content or application data may be separately managed as meta data or the like. 
     In order to protect the user from a malicious third party accessed via a communication path such as the internet, it may be configured such that key information for decrypting and playing back the content encrypted by an RSA cryptography or the like is managed. Note that the various pieces of information may be recorded by utilizing a recording medium such as a hard disk, and read into the memory managed by the content manager  702 . 
     Based on a distribution request from a device such as the wireless terminal  102  or  103  or the television receiver  101  via the communication I/F  401  or external network  105 , the content distributor  703  can control distribution of the content such as moving images accumulated in the content  405  of the storage  404  according to display performance of the connection device. 
     The content  405  includes a plurality of the same content in various resolutions and distributes the content according to the display performance based on the device authentication information at a time of distribution. It may be configured such that only high definition (HD) content is accumulated and is accordingly down-converted to be distributed according to the display performance at the time of distribution. 
     &lt;Data Format Example&gt; 
       FIGS. 8( a ) and 8( b )  are data tables showing an example of the user profile information managed by the user profile generator  609  of  FIG. 6 . 
       FIG. 8( a )  shows the user profile information managed by the user profile generator  609  of the wireless terminal  102 .  FIG. 8( b )  shows the user profile information managed by the user profile generator  609  of the wireless terminal  103 . 
     As shown in  FIGS. 8( a ) and 8( b ) , the user profile information is constituted by a user ID  801  which is a management number, a password  802 , a unique username  803 , a setting parameter  804 , an application type  805 , downloaded content  806 , device type information  807  and the like. 
     The user ID  801  and the password  802  are each the authentication information for receiving content distribution from the content distribution server  106 . In addition, in the present embodiment, the user profile information includes the authentication information; however, the user profile information may not include the authentication information for security reasons and the like. 
     The username  803  is unique information of each user and is used when logging in to the content distribution server  106 . The examples shown in  FIGS. 8( a ) and 8( b )  indicate that the username associated with a wireless terminal A which is the wireless terminal  102  is “T. Matsu” and the username associated with a wireless terminal B which is the wireless terminal  103  is “M. Kage”. 
     The setting parameter  804  includes information such as a menu set according to the user&#39;s preference. The application type  805  includes a title of the application installed before purchase, obtained by download purchasing or the like. 
     The downloaded content  806  includes the title and the like for identifying the content obtained by download purchasing or the like. The device type information  807  is information indicating a type of device such as a mobile terminal or a tablet and an application such as an OS in use and compatibile during content playback, and a user agent may also be used. The user agent is software or hardware utilized when the user uses data based on a given protocol. 
     In addition, the present embodiment will be described under the presumption that user authentication uses the user ID and the password; however, user authentication may use common biometric information such as finger veins, a fingerprint, a voice, a face image or an iris. In this case, item names of the user authentication information change as appropriate. 
       FIGS. 9( a ) and 9( b )  are data tables showing item examples of the user authentication information  407  and device authentication information  406  of  FIG. 4 . 
       FIG. 9( a )  is the data table of the user authentication information  407  managed by the user manager  701  of the content distribution server  106 .  FIG. 9( b )  is the data table of the device authentication information  406  managed by the user manager  701  of the content distribution server  106 . 
     In  FIG. 9( a ) , the user ID  801  which is the management number, the password  802 , the unique username  803 , name, street address, contact and the like are stored in the user authentication information  407  managed by the user manager  701 . 
     The present embodiment will be described under the presumption that user authentication uses a password; however, user authentication may use common biometric information such as finger veins, a fingerprint, a voice, a face image or an iris. In this case, item names of the user authentication information change as appropriate. The user authentication information is used as login information when logging in to the content distribution service from a device such as the television receiver  101  or the wireless terminal  102 . 
     Next, in  FIG. 9( b ) , the device authentication information  406  managed by the user manager  701  of the content distribution server  106  includes the user ID  801  which is the management number, the password  802 , a device ID  901  indicating the device used by the user, a model name and the like. The device authentication information  406  is information for uniquely identifying a device and is registered to the content distribution service provider in advance by the user. 
     In addition,  FIG. 9( b )  shows that the user whose user ID  801  is “00000101” possesses two devices indicated by the device ID  901 , and (AB-C1000) indicating the television receiver  101  and (DF-2000F) indicating the wireless terminal  102  are registered as devices. 
     Similarly, regarding the user whose user ID  801  is “00000102”, (GH-10000) indicating the wireless terminal  103  is registered as the device. The password  802  used may differ from the password of the user authentication information. 
     Information such as a MAC (Media Access Control) address unique to the device can be used for the device ID  901 . In addition, the type of content available for playback and resource information such as video processing capability can be associated with the device ID in advance and be accumulated as a database. 
     &lt;Example of Actions in Network Terminal System&gt; 
     Next, actions in the network terminal system according to the present embodiment will be described with reference to  FIGS. 10 to 21 . Here, actions for distributing content from the content distribution server  106  to the television receiver  101  and displaying the content on the television receiver  101  by using the wireless terminals  102  and  103  as operation terminals will be described. 
       FIG. 10  is a flowchart showing an example of processes performed by the wireless terminal  102  and television receiver  101  within the network terminal system of  FIG. 1 .  FIG. 10  shows an example in which, when the wireless terminal  102  is connected to the television receiver  101 , the wireless terminal  102  and the television receiver  101  exchange information. 
     In addition,  FIGS. 11( a ) and 11( b )  are explanatory drawings showing a display example of the wireless terminal  102  of the network terminal system of  FIG. 1 .  FIG. 11( a )  shows a display example of a menu screen of the wireless terminal  102 .  FIG. 11( b )  shows a display example of a connection device list display screen of the wireless terminal  102 . 
     First, in  FIG. 10 , when a tap operation is performed on a TV operation App  1102  displayed on a menu screen  1101  of  FIG. 11( a ) , the various application unit  608  of the wireless terminal  102  receives an instruction for activating the application by the input unit  311  and activates the “TV operation App” application (step S 1001 ). 
     When the “TV operation App” application is activated, the device list  1103  as shown in  FIG. 11( b )  is displayed on the display  308  of the wireless terminal  102  (step S 1002 ). In a case where devices connected to the network are found, the devices are displayed in the device list  1103  of  FIG. 11( b )  regardless of authentication, and these devices are stored in the storage  304  together with the authenticated or non-authenticated information. 
       FIG. 11( b )  shows the device list  1103  displaying, for example, “TV 1  authenticated” as an indication  1106  and “Cancel” as an indication  1107 , and shows that “TV 1 ” is an authenticated device. “Cancel” of the indication  1107  is an item to be selected in a case where the wireless terminal is used alone without preforming authentication of the device. Here, TV 1  indicates the television receiver  101 . 
     As shown in  FIG. 11( b ) , the wireless terminal  102  displays “authenticated” for the device already authenticated by the connection device authentication unit  501 , that is, a device among the devices connected to the network having a device ID registered to the device authentication information. The wireless terminal  102  displays “not authenticated” for non-authenticated devices, that is, devices whose device IDs are not registered. 
       FIG. 11( b )  shows a display example in a case where the “TV 1  indication” is already authenticated in the wireless terminal  102 . In addition, a check mark  1105  is displayed on the selected device, and the user can discriminate between devices selected and not selected. Further, an edit button  1104  is a button for deleting the connection device or adding a connection device. 
     In order to receive authentication from the television receiver  101  when the device to be connected is selected by the input unit  311  of  FIG. 11( b ) , the connection device authentication unit  601  of the wireless terminal  102  sends the connection device authentication information registered in the various data in advance to the connection device authentication unit  501  of the television receiver  101  via the communication I/F  309  and communication I/F  212  (step S 1003 ). Here, a case where the television receiver  101  is selected in a process of step S 1003  will be described by way of example. 
     When the connection device authentication unit  501  of the television receiver  101  receives the connection device authentication information from the wireless terminal  102 , the connection device authentication unit  501  compares the authentication information stored in the various data and the authentication information sent from the wireless terminal  102 . If these pieces of authentication information match (step S 1004 : YES), presence of an authenticated user is confirmed (step S 1005 ). 
     If no authenticated user is present (step S 1005 : NO), connection of the wireless terminal  102  is permitted (step S 1006 ). When authentication of the wireless terminal  102  is completed, the account manager  509  sets the wireless terminal  102  as an authenticated user account. 
     If the pieces of the authentication information do not match (step S 1004 : NO), an error message is sent to the user of the wireless terminal  102 . If the pieces of authentication information do not match, a message prompting re-entry of the information may be displayed. 
     In addition, if an authenticated user (step S 1005 : YES) is present, a message is sent indicating that the currently authenticated wireless terminal is preferentially used and the wireless terminal  102  is stopped from being used. 
     Here, if there is no response because the television receiver  101  is not powered ON or because of another reason, a power-ON command for activating power of the television receiver  101  can be added in a process of step S 1003 , so that device authentication can be performed again. This process can narrow down the devices which use the television receiver  101  by a remote operation and enhance security. In addition, in a case where the connection is established with the same device as the previous one, step S 1002  can be omitted by performing automatic authentication. 
     Subsequently, when the wireless terminal  102  is notified of a connection permission in a process of step S 1006 , the user profile generator  609  of the wireless terminal  102  generates the profile information of the user of the wireless terminal  102  (step S 1007 ) and sends the profile information to the television receiver  101  (step S 1008 ). 
     The television receiver  101  associates the received profile information and the user account authenticated in a process of step S 1004  and stores the user profile information of the wireless terminal  102  in the various data of the storage  216  (step S 1009 ). 
     Next, a case where, after the television receiver  101  is operated by the wireless terminal  102 , device connection between the wireless terminal  102  and the television receiver  101  is completed will be described. 
     When a tap operation is performed on an “end” button (not shown) displayed on the display  308  of the wireless terminal  102 , operation information indicating a device connection end is sent to the television receiver  101  (step S 1010 ). The television receiver  101  deletes the user profile information obtained from the wireless terminal  102  (step S 1011 ), sends the device connection end to the wireless terminal  102  and logs out (step S 1012 ). 
     Here, as described with reference to  FIGS. 8( a ) and 8( b ) , the user profile information includes information such as the authentication information including the user ID  801  and the password  802 , information of the setting parameter  804  such as the menu, the application type  805  including the preferred applications, the downloaded content  806  including the preferred content and the device type information  807 . 
     Further, in a case where these pieces of information are carried over to be used in the television receiver  101 , the pieces of information correspond to the device authentication information of the wireless terminal  102  and are independently stored such that the same setting state, device state and the like as in the wireless terminal  102  can be used. 
     In addition, in a case where the profile information stored in a process of step S 1009  is changed during the operation of the television receiver  101 , the updated data can be stored as the latest data. The updated profile information can also be imported to the wireless terminal  102  before device connection end is performed in a process of step S 1010 . 
     Next, actions that occur when the television receiver  101  and the content distribution server  106  exchange the content information and the content list is displayed on the television receiver  101  and actions that occur when the content is displayed will be described with reference to  FIG. 12 . 
       FIG. 12  is a flowchart showing an example of processes performed by the wireless terminal  102 , the television receiver  101  and the content distribution server  106  within the network terminal system of  FIG. 1 . 
       FIG. 12  shows additional processes of step S 1201  to step S 1210  continued from a sequence (S 1001  to S 1009 ) of  FIG. 10  of sending and storing the profile information from the wireless terminal  102  to the television receiver  101 . 
     The television receiver  101  sends operation screen information to the wireless terminal  102  for displaying the operation screen on the display  308  of the wireless terminal  102  (step S 1201 ). The wireless terminal  102  displays the operation screen shown in  FIGS. 13( a ) and 13( b )  on the display  308  based on the operation screen information.  FIGS. 13( a ) and 13( b )  show an explanatory drawing showing a display example of the operation screen of the wireless terminal  102  within the network terminal system of  FIG. 1 . 
     As shown in  FIGS. 13( a ) and 13( b ) , operation buttons  1303  and  1304  corresponding to the connected device are displayed on an operation screen  1301 . A connection device symbol  1302  indicates the currently connected device. 
     In addition, when a right-flick or left-flick operation is performed on the operation screen  1304 , the operation screen for the operation buttons can be switched. In  FIG. 13( a ) , the left-flick allows the operation screen to be switched to the operation screen of  FIG. 13( b ) . In addition, a flick operation in the opposite direction allows the operation screen of  FIG. 13( b )  to return to the operation screen of  FIG. 13( a ) . 
       FIGS. 13( a ) and 13( b )  show two operation screens; however, one operation screen or a plurality of operation screens may be provided for each device. In addition, button arrangement on the operation screen can be changed according to the user&#39;s preference or can be changed such that the buttons are automatically or manually rearranged in the order of frequent usage. Further, a triangular mark  1305  is a mark for ending the operation screen, and when a tap operation is performed on the triangular mark  1305 , an operation screen  3101  is closed and the screen returns to the menu screen shown in  FIG. 11( a ) . 
     Here, the operation screen information is obtained from the television receiver  101  in a process of step S 1201 ; however, obtaining the operation screen information may be omitted by installing an application program downloaded in advance in the wireless terminal  102 . 
     In  FIG. 13( b ) , when a tap operation is performed on an App menu button  1306  on the operation screen by the input unit  311  of the wireless terminal  102 , “operation information (select)” of the App menu button  1306  is sent to the television receiver  101  (step S 1203 ). 
     When the controller  214  of the television receiver  101  receives the “operation information (select)” of the App menu button  1306 , the controller  214  refers to the user profile information stored in the process of step S 1009  of  FIG. 10  and displays an App menu screen  1401  on the display  210  as shown in  FIG. 14  based on user settings of the wireless terminal  102 . 
       FIG. 14  is an explanatory drawing showing a display example of an App menu screen of the television receiver  101  within the network terminal system of  FIG. 1 . 
     Here, although not shown, there may be a case where an application indicated by an object of the application activation icon based on the user profile information stored in the process of step S 1009  of  FIG. 10  is not present in the App menu of the television receiver  101 . 
     In this case, the content/application synchronization processor  510  can search for the matching application and download the application from the content distribution server  106  to synchronize the applications of the wireless terminal  102  and the television receiver  101 . 
     Next, when a tap operation is performed on a cursor/OK button  1307  on the operation screen  1301  of the wireless terminal  102 , the “operation information (select)” is sent as in a process of step S 1203  and the television receiver  101  selects an icon  1402  of the “content distribution service” in, for example, the App menu screen  1401  based on the received “operation information (select)” (step S 1204 ). 
     The various application unit  508  of the television receiver  101  receives an instruction for activating the browser and activates the browser engine  502  (step S 1205 ). The browser engine  502  refers to the user profile information stored in the process of step S 1009  of  FIG. 10  and accesses the content distribution server  106  of a content viewing portal set in advance in the wireless terminal  102 . 
     Here, it may be configured such that an address of the content viewing portal is selected from an address list set in advance in “preference settings” or the like within a setting parameter of the user profile information or may be configured such that the last accessed address is stored and is later accessed. 
     Further, the browser engine  502  sends a request message from the external network  105  to the content distribution server  106  via the communication I/F  212  and wireless router  104 , requesting resources such as web content that complies with HTTP (HyperText Transfer Protocol). 
     The content distribution server  106  creates and returns a response message corresponding to the received request message. 
     The returned response message is entered into the browser engine  502  via the external network  105 . 
     An HTML document is embedded in the response message. The HTML parser  503 , the database generator  504 , the renderer  505  and the image processor  506  of the browser engine  502  work together to generate a browser display screen based on the HTML document, so that the login screen of the content viewing portal is displayed on the display  210  (step S 1206 ). 
     In the login screen displayed by the above-described processes, the controller  214  notifies login information including the entered username and password to the browser engine  502  by the same operation information as in the process of step S 1203  and sends a received character string to the content distribution server  106  as a request message (step S 1207 ). 
     The content distribution server  106  refers to the user authentication information stored in the user authentication information  407  by the user manager  701  and authenticates the user if the user is an authorized and registered user (step S 1206 ). 
     Here, in  FIG. 12 , the login screen is displayed in a process of step S 1206  in a case where the user authentication information is not included in the user profile information for security reasons and the like. However, it can be configured such that an automatic authentication processing is performed by referring to the user ID and the password of the user profile information stored in the process of step S 1009  of  FIG. 10 . In this case, the process of step S 1206  can be omitted. 
     Subsequently, when authentication in a process of step S 1208  is completed, the content manager  702  of the content distribution server  106  returns the content list information to the browser engine  502  as a response message (step S 1209 ). 
     The content list information sent at this time is information for displaying a list of the content managed by the content manager  702  and includes information for identifying the managed content. 
     When the browser engine  502  receives the content list information from the content manager  702 , the browser engine  502  refers to the content ID for uniquely identifying the content, content description information (genre title, cast, plot and the like), a fee for playing back and viewing the content, a viewing period and the like included in the content list information and displays the content list display screen on the display  210  as shown in  FIG. 15  (step S 1210 ). Note that the content description information includes a genre title, cast, plot and the like. 
       FIG. 15  is an explanatory drawing showing a display example of the content list display screen of the television receiver  101  within the network terminal system of  FIG. 1 . 
     In  FIG. 15 , a content title name, a viewing fee, a viewing period and the like are displayed on a content title display  1501 . In addition, a back button  1503  is a button for returning to a higher level of information by a tap operation and allows the screen to return to the previous genre level. 
       FIG. 15  shows that a button  1504  of a Japanese movie in a movie genre is selected. An end button  1505  is an operation unit for instructing end of content viewing by a tap operation. 
     In the screen shown in  FIG. 15 , when a title  1502  of the content to be viewed is selected in the content list display screen by the operation information of the wireless terminal  102 , a content detail display screen  1601  shown in  FIG. 16  is displayed. 
       FIG. 16  is an explanatory drawing showing a display example of the content detail display screen of the television receiver  101  within the network terminal system of  FIG. 1 . 
     In  FIG. 16 , the title, cast and plot details are displayed in content details  1602 . A preview button  1604  is an operation unit for instructing display of a portion of the content such that the content can be partially confirmed before purchase. An index screen  1603  is a still image showing one scene of the content and can display moving images of a portion of the content by selecting the preview button  1604 . 
     Purchase buttons  1605   a  and  1605   b  are operation units for selecting and purchasing the content. In  FIG. 16 , the purchase buttons  1605   a  and  1605   b  respectively associated with an HD (High Definition) image quality content and an SD (Standard Definition) image quality content are provided for selecting and purchasing the HD image quality content or the SD image quality content. A back button  1606  is an operation unit for returning to the content list display screen of  FIG. 15 , that is, for instructing switching of the display to the content list display screen. 
     In the content detail display screen shown in  FIG. 16 , when one of the purchase buttons  1605   a  and  1605   b  is selected by the operation information of the wireless terminal  102  (step S 1211 ), the controller  214  sends content selection information to the content distribution server  106  (step S 1212 ). 
     The content selection information includes information for identifying desired content and information for identifying whether the desired content is in HD image quality or in SD image quality as necessary. 
     The content distribution server  106  generates the key information for decrypting the content identified based on the content selection information and sends the key information to the television receiver  101  (step S 1213 ). 
     The key information is constituted by the decryption key for decrypting the information of the encrypted content as well as the content ID for each item of content, the expiration date or the number of times the content can be played back, and the like. Note that the step (step S 1213 ) of sending the key information is necessary to encrypt the content and may be omitted if the content does not need to be encrypted. 
     When the television receiver  101  receives the key information from the content distribution server  106  and completes preparation for receiving the content, the television receiver  101  sends a content distribution start request (step S 1214 ). The content distributor  703  of the content distribution server  106  having received the distribution start request from the television receiver  101  starts the content distribution to the television receiver  101  (step S 1215 ). 
     When a tap operation is performed on “play” on an operation screen  1213  screen shown in  FIG. 13( b )  by the user&#39;s operation via the input unit  311  (step S 1216 ), the wireless terminal  102  sends operation information (playback) to the television receiver  101  (step S 1217 ). 
     In the television receiver  101  having received the operation information (playback), the content player  507  performs playback processing of the content. At this time, if there is a decryption key, the decryption key is utilized to decrypt information of encrypted content and start playback of the content (step S 1218 ). 
     In a case where a stop operation button on the operation screen  1304  shown in  FIG. 13( b )  is selected (step S 1219 ), the wireless terminal  102  sends operation information (stop) to the television receiver  101  (step S 1220 ), and the television receiver  101  sends a distribution stop request to the content distribution server  106  (step S 1221 ). 
     In a case where the content distribution server  106  receives the distribution stop request from the television receiver  101  or the content distribution server  106  detects an end of the content (step S 1222 ), the content distribution server  106  stops distributing the content (step S 1223 ) and sends a content distribution end notification to the television receiver  101  (step S 1224 ). 
     When the television receiver  101  receives the content distribution end notification, the television receiver  101  stops playing back the content (step S 1225 ). Here, it can be configured such that the television receiver  101  returns to a state before start of content playback when the television receiver  101  stops playback in a process of step S 1219 . 
     In addition, in a case where playback is stopped by the process of step S 1219 , information of the playback stop position of the content is stored in the user profile information of the storage  216  of the wireless terminal  102  as resume information. 
     Further, in a case where playback operation is performed again via the wireless terminal  102  and playback of the same content is resumed by the same user, the content player  507  of the television receiver  101  can obtain data of the playback stop position from the resume information and resume playback by using the playback stop position as the playback start position. 
     In addition, the information of the playback stop position of the content can be held by the content distribution server  106 . In this case, the content distribution server  106  sends the information of the playback stop position of the content together with the information of the content in the process of step S 1215 . 
     In this manner, distribution can be started in the television receiver  101  from the playback start position calculated based on the information of the playback stop position obtained together with the information of the content from the content distribution server  106 . 
     Note that a flow of actions in a case where distribution of the content is received from the content distribution server  106  to playback the content has been described; however, it may be configured such that all items of content data are obtained and accumulated at the timing of the process of step S 1215  of  FIG. 12 , and the content is played back for viewing after accumulation is completed. In this case, the process of step S 1222  and the process of step S 1223  of  FIG. 12  are unnecessary. 
     In addition, in the process of the step S 1213  of sending the key information, the television receiver  101  can store the key information received from the content distribution server  106  in the storage  216 . Alternatively, the key information can be discarded each time and be obtained from the content distribution server at the timing of the process of step S 1218  every time the content is played back. 
     In addition, in a case where the content downloaded from the content distribution server  106  and played back on the wireless terminal  102  is stopped part way through the content, and the user wishes to view the rest of the content on the television receiver  101 , the downloaded content can be synchronized between the wireless terminal  102  and the television receiver  101  by the content/application synchronization processor  510  of the television receiver  101  based on the user profile information. 
     Here, in a case where the wireless terminal  102  is used alone, the content player  607  performs the playback processing of the content as in the content player  507  of the television receiver  101 . 
     Next, actions that occur when the wireless terminal  102  and the wireless terminal  103  simultaneously access the television receiver  101 , the content information is exchanged between the television receiver  101  and the content distribution server  106 , and the content list is displayed on the television receiver  101  will be described with reference to  FIG. 17 . 
       FIG. 17  is a flowchart showing an example of processes performed by the wireless terminals  102  and  103 , the television receiver  101  and the content distribution server  106  within the network terminal system of  FIG. 1 . 
       FIG. 17  shows an action sequence of the wireless terminal  103  newly added to the action sequence of the wireless terminal  102 , the television receiver  101  and the content distribution server  106  shown in  FIG. 12 . 
     First, after the processes of steps S 1001  to S 1009  in the sequence of  FIG. 10  of sending and storing the profile information from the wireless terminal  102  to the television receiver  101 , the television receiver  101  sends the operation screen information for displaying the operation screen on the display  308  of the wireless terminal  102  to the wireless terminal  102  in the process of step S 1201 . 
     The wireless terminal  102  displays the above-described operation screen on the display  308  as shown in  FIG. 13  based on the operation screen information in a process of step S 1202 .  FIG. 13  shows a display example of the operation screen of the wireless terminal  102 . Details of  FIG. 13  has been described above, and thus, redundant descriptions will be omitted. 
     Likewise, after the processes of steps S 1001  to S 1009  in the sequence of  FIG. 10  of sending and storing the profile information from the wireless terminal  103  to the television receiver  101 , the television receiver  101  sends the operation screen information for displaying the operation screen on the display  308  of the wireless terminal  103  to the wireless terminal  103  in a process of step S 1701 . The wireless terminal  103  displays the operation screen shown in  FIG. 13  on the display  308  based on the operation screen information in the process of step S 1702 . 
     According to the above-described action sequence, the television receiver  101  can identify that the wireless terminals  102  and  103  are capable of simultaneously accessing the television receiver  101 . 
     Here, it is assumed that a tap operation is performed on the cursor/OK button  1307  on the operation screen  1301  of any one of the wireless terminals capable of simultaneously accessing the television receiver  101 .  FIG. 17  will be described below under the assumption that a tap operation is performed on the cursor/OK button  1307  on the operation screen  1301  of the wireless terminal  102  in the process of step S 1203 . 
     When a tap operation is performed on the cursor/OK button  1307  on the operation screen  1301  of the wireless terminal  102 , “operation information (select)” is sent as in the process of step S 1203 , and the television receiver  101  displays a login screen of the content viewing portal on the display  210  according to the processes of steps S 1204  to  51206  in the action sequence shown in  FIG. 12 . 
     In the login screen displayed by the above-described processes, the controller  214  notifies the login information including the username and password entered from the wireless terminal  102  to the browser engine  502  by the same operation information as in the process of step S 1203  and sends a received character string to the content distribution server  106  as a request message (step S 1207 ). 
     The content distribution server  106  refers to the user authentication information information stored in the user authentication information  407  by the user manager  701  and authenticates the user if the user is the authorized and registered user (step S 1208 ). 
     When authentication in the process of step S 1208  is completed, the content manager  702  of the content distribution server  106  returns the content list information available for viewing by the user of the wireless terminal  102  to the browser engine  502  as a response message (step S 1209 ). 
     Subsequently, the television receiver  101  displays the same login screen as in step S 1206  targeting the wireless terminal  103  (step S 1703 ). In the login screen displayed by the same processes as above, the controller  214  notifies the login information including the username and password entered from the wireless terminal  103  to the browser engine  502  by the same operation information (step S 1704 ) as in the process of step S 1203  and sends a received character string to the content distribution server  106  as a request message (step S 1705 ). 
     The content distribution server  106  refers to the user authentication information stored in the user authentication information  407  by the user manager  701 , and authenticates the user if the user is the authorized and registered user (step S 1706 ). 
     When authentication in step S 1706  is completed, the content manager  702  of the content distribution server  106  returns the content list information available for viewing by the user of the wireless terminal  103  to the browser engine  502  as a response message (step S 1707 ). 
     The television receiver  101  repeats the action sequence in the processes of steps S 1703  to S 1707  targeting all wireless terminals that are capable of simultaneous accessing the television receiver  101  and are not yet logged in. 
     Note that the television receiver  101  may temporarily store the login information including the username and password entered from the wireless terminals  102  or  103  in the memory  215  and collect and successively send all pieces of login information stored in the memory  215  to the content distribution server  106  after all pieces of information are entered from the wireless terminals  102  and  103 . 
       FIG. 18  is an explanatory drawing showing a display example of a login completed notification screen displayed on the television receiver. 
     Every time the user authentication is completed by the content distribution server  106 , that is, after the process of step S 1208  and a process of step S 1706 , the television receiver  101  may display a login completed notification screen  1801  shown in  FIG. 18 . 
     At this time, the notification message to be displayed may include a message  1802  notifying a newly logged-in username and a message  1803  notifying all logged-in usernames. 
     Subsequently, the controller  214  of the television receiver  101  creates an aggregated content list (step S 1708 ) and displays the aggregated content list display screen on the display  210  (step S 1709 ). The aggregated content list is constituted by the content list information which is sent in a process of step S 1209  and is available for viewing by the user of the wireless terminal  102  and the content list information which is sent in a process of step S 1407  and is available for viewing by the user of the wireless terminal  103 . 
       FIG. 19  is an explanatory drawing showing a display example of an aggregated content list display screen  1901  displayed on the television receiver  101 . 
     As shown in  FIG. 19 , the aggregated content list display screen  1901  may include a title name  1902  and a username  1903  such that the title and the corresponding user are recognized. 
     Note that, in the example of the aggregated content list display screen  1901 , an indication  1904  of Titles 1 to 3 indicates content available for viewing by the username: T. Matsu, and an indication  1905  of Titles 4 and 5 indicates content available for viewing by the username: M. Kage. The username: T. Matsu is the user of the wireless terminal  102 , and the username: M. Kage is the user of the wireless terminal  103  and the television receiver  101 . 
     It may be configured such that, before aggregating the content list information in a process of step S 1708 , the television receiver  101  displays a sort process selection screen  2001  shown in  FIG. 20  in which the wireless terminal  102  or the wireless terminal  103  can select display by an indication  2004  or by an indication  2005 . 
     The indication  2004  generates and displays a list of title names rearranged in alphabetical order or the like. The indication  2005  generates and displays a list of usernames rearranged in alphabetical order or the like. 
     At this time, a message  2002  indicating currently logged-in usernames, that is, usernames whose items of content are aggregated, and a message  2003  describing an action of the television receiver  101  such as “Content which the above users can view will be displayed” may be displayed. 
     In a case where each user operates the television receiver  101  via the wireless terminals  102  and  103  to end device connection between the wireless terminals  102  and  103  and the television receiver  101 , the wireless terminals  102  and  103  are logged out one by one according to the processes of steps S 1010  to S 1012  which is the action sequence shown in  FIG. 10 . 
       FIG. 21  is an explanatory drawing showing a display example of a logout notification screen displayed on the television receiver  101 . 
     As shown in  FIG. 21 , when the wireless terminals  102  and  103  log out, the television receiver  101  may display a logout notification screen  2101  and a message  2102  indicating which user has logged out. 
     In addition, in a case where the user (M. Kage) logs out while viewing the content associated with the user account of the user (M. Kage) as in the indication  1905  of Titles  4  and  5  shown in  FIG. 19 , the television receiver  101  may send the distribution stop request to the content distribution server  106  (step S 1221 ) and immediately disable viewing of this content. 
     Alternatively, the television receiver  101  may perform controls such that the user can continue to view the content during a certain period such as until the end of the content or until the television receiver  101  is turned off. 
     Namely, it may be configured such that the television receiver  101  does not send the distribution stop request to the content distribution server  106  (step S 1221 ) until this certain period passes. In addition, it may be configured such that the user can view the content several times during a certain period such as for 24 hours after the other user (M. Kage) has logged out. 
     Namely, it may be configured such that the television receiver  101  continues to maintain the login information (username and password) of the logged-out user (M. Kage) in the memory  215  during the certain period and sends the login information related to the logged-out user (M. Kage) in a process of step S 1705  shown in  FIG. 17 . 
     It may be configured such that a message  2103  as shown in  FIG. 21  indicating a period during which content can be viewed is displayed at this time. 
     In the above-described manner, the content lists associated with the user account of each user can be aggregated and displayed as one aggregated list by the plurality of users respectively using the wireless terminals  102  and  103  to share and simultaneously log in to the television receiver  101 . 
     In this manner, it is possible to improve user-friendliness of the network terminal system. 
     (Second Embodiment) 
     &lt;Overview&gt; 
     According to a second embodiment, the wireless terminals  102  and  103  simultaneously log in to the content distribution server  106  via the television receiver  101  to obtain services with an added value, that is, a value-added service from the content distribution server  106 . 
     It is assumed that the value-added service is prepared in advance by the service provider providing the content. 
     &lt;Example of Actions in Network Terminal System&gt; 
       FIG. 22  is a flowchart showing an example of processes in a network terminal system according to the second embodiment. 
     The second embodiment will be described with emphasis on differences from the first embodiment. The configuration of the network terminal system, the software configuration of the television receiver  101  and the software configuration of the wireless terminal  102  are the same as those of the first embodiment, and thus, redundant descriptions will be omitted. 
       FIG. 22  is a flowchart corresponding to  FIG. 17  of the first embodiment, and hereinafter, the second embodiment will be described with emphasis on differences from the first embodiment. 
     An action sequence, particularly a process of step S 2202  and a process of step S 2205 , of the flowchart shown in  FIG. 22  significantly differs from the action sequence shown in  FIG. 17 . 
     The process of step S 2202  is a process of sending aggregated login information described below from the television receiver  101  to the content distribution server  106 . The process of step S 2205  is a process of creating an aggregated service menu in the content distribution server  106 . 
     First, in step S 1201  of  FIG. 22  continued from the processes of steps S 1001  to S 1009  which are the sequence of  FIG. 10  of sending and storing the profile information from the wireless terminal  102  to the television receiver  101 , the television receiver  101  sends the operation screen information for displaying the operation screen on the display  308  of the wireless terminal  102  to the wireless terminal  102  as in the sequence shown in  FIG. 17  (S 1201 ). 
     The wireless terminal  102  displays the operation screen shown in  FIG. 13  on the display  308  based on the operation screen information in the process of step S 1202 . In addition, in the process of step S 1701  continued from steps S 1001  to S 1009  which are the sequence of  FIG. 10  of sending and storing the profile information from the wireless terminal  103  to the television receiver  101 , the television receiver  101  sends the operation screen information for displaying the operation screen on the display  308  of the wireless terminal  103  to the wireless terminal  103 . The wireless terminal  103  displays the operation screen shown in  FIG. 13  on the display  308  based on the operation screen information in the process of step S 1702 . 
     When a tap operation is performed on the cursor/OK button  1307  of an operation screen  1301  of the wireless terminal  102 , “operation information (select)” is sent as in the process of step S 1203 , and the television receiver  101  displays a login screen of the content viewing portal on the display  210  according to the processes of steps S 1204  to S 1206  which are the action sequence shown in  FIG. 12 . 
     In the login screen displayed by the above-described processes, the controller  214  temporarily stores the login information including the username and password entered from the wireless terminal  102  in a memory  215  by the same operation information as in the process of step S 1203 . 
     Likewise, the television receiver  101  displays the same login screen as in the process of step S 1206  targeting the wireless terminal  103  (step S 1703 ). In the login screen displayed by the above-described processes, the controller  214  temporarily stores the login information including the username and password entered from the wireless terminal  103  in the memory  215  by the same operation information (step S 1704 ) as in the process of step S 1203 . 
     Subsequently, the television receiver  101  generates the aggregated login information (step S 2201 ) and sends the aggregated login information to the content distribution server  106  (step S 2202 ). 
     &lt;Example of Aggregated Login Information&gt; 
       FIG. 23  is an explanatory drawing showing an example of aggregated login information  2301  generated in a process of step S 2201  of  FIG. 22 . 
     As shown in  FIG. 23 , the aggregated login information  2301  includes a flag  2302  and pieces of login information  2303  and  2304 . The flag  2302  is a flag for distinguishing general login information. The pieces of login information  2303  and  2304  are pieces of login information related to all users attempting to simultaneously log in. In this case, the login information  2303  is login information related to the wireless terminal  102 , and the login information  2303  is login information related to the wireless terminal  103 . 
     The content distribution server  106  having received the aggregated login information  2301  refers to the user authentication information stored in the user authentication information  407  by the user manager  701  and performs user authentication for all users included in the aggregated login information as long as the users are authorized and registered users. Namely, the user authentication of the wireless terminal  102  is performed in the process of step S 2203 , and the user authentication of the wireless terminal  103  is performed in step S 2204 . 
     After authentication of all users is completed, the content distribution server  106  generates aggregated service information described below (step S 2205 ) and sends the aggregated service information to the television receiver  101  (step S 2206 ). At this time, details of aggregated service may be changed according to the number of users in the aggregated login information. 
     The television receiver  101  displays an aggregated service display screen  2401  generated based on the received aggregated service information and shown in  FIG. 24  (step S 2207 ). 
     &lt;Display Example of Aggregated Service Display Screen&gt; 
       FIG. 24  is an explanatory drawing showing a display example of the aggregated service display screen in a process of step S 2207  of  FIG. 22 . 
     The aggregated service display screen  2401  may include a message  2402  indicating an added value obtained when the wireless terminals  102  and  103  simultaneously log in to the content distribution server via the same television receiver  101 . 
     In the example shown in  FIG. 24 , the added value is that a premiere title becomes available for viewing, the premiere title being a content title not available for viewing normally, that is, in a state where only a single wireless terminal is logged in. 
     In addition, the aggregated service information sent from the content distribution server  106  includes content list information  2403 , and a message  2404  indicating that Title  1  of the content list information  2403  is a premiere title now available for viewing is displayed. 
     At this time, the content distribution server  106  may generate the content list information  2403  such that the premiere title is displayed at a higher level than general titles. Alternatively, the television receiver  101  may sort and display the content list information  2403  such that the premiere title is displayed at a higher level than the general titles. 
     &lt;Another Display Example of Aggregated Service Display Screen&gt; 
       FIG. 25  is an explanatory drawing showing another display example of an aggregated service display screen in the process of step S 2207  of  FIG. 22 . 
     An aggregated service display screen  2501  shown in  FIG. 25  may include a message  2502  indicating an added value obtained when the wireless terminals  102  and  103  simultaneously log in to the content distribution server via the same television receiver  101 . 
     In the example shown in  FIG. 25 , the added value is that a for-pay content becomes available at a fee that is cheaper than normal, that is, when a single wireless terminal is logged in. 
     In addition, the aggregated service information sent from the content distribution server  106  includes content list information  2503 , and a message  2504  is displayed in the content list information  2503 . 
     The message  2504  displays a message indicating that Titles 1 to 4 can be viewed in HD quality at the same price (for example, 300 yen) of viewing in SD quality. 
     At this time, in order to clarify which portion has been changed, the content distribution server  106  may generate the content list information  2403  such that the changed portion is highlighted and displayed by blinking the changed portion, by displaying the changed portion into bold characters or the like, or by displaying the original and changed items side by side. 
     In the case of  FIG. 25 , the portion indicating the changed item is, for example, an HD viewing fee, and the original and changed items correspond to the indication of ¥500→¥300. 
     As described above, the aggregated login information obtained by aggregating the pieces of login information of the plurality of users as one information is sent to the content distribution server, so that special services, that is, aggregated services unobtainable by a single user can be provided. 
     In this manner, it is possible to enhance the added value of the network terminal system. 
     (Third Embodiment) 
     &lt;Overview&gt; 
     A third embodiment will describe an example of actions in which a service with an added value can be obtained from the content distribution sever by the plurality of wireless terminals simultaneously logging in to the content distribution server via the same television receiver. In particular, a value-added service with an added value to billing will be described. 
     The value-added service obtains a service for splitting a fee for viewing or using the content between the plurality of users, in other words, a split payment service. 
     It is assumed that the value-added service is prepared in advance by the service provider providing the content. 
     &lt;Example of Actions in Network Terminal System&gt; 
       FIG. 26  is a flowchart showing an example of actions in the network terminal system according to the third embodiment. 
     In  FIG. 26 , the processes from step S 1011  of starting the processing of the wireless terminal  102  and the wireless terminal  103  to step S 2203  and  2204  of performing user authentication in the action sequence of  FIG. 22  of the second embodiment are the same (common). Further, the processes subsequent to step S 2205  of generating aggregated service information shown in  FIG. 22  are replaced with the processes subsequent to the step of generating aggregated service information (step S 2601 ) shown in  FIG. 26 . 
     In  FIG. 26 , the content distribution server  106  generates the aggregated service information related to billing (step S 2601 ) and sends the aggregated service information to the television receiver  101  (step S 2602 ). The television receiver  101  generates and displays a billing menu display screen based on the received aggregated service information (step S 2603 ). 
     &lt;Display Example of Billing Menu Display Screen&gt; 
       FIG. 27  is an explanatory drawing showing a display example of a billing menu display screen  2701  in the process of step S 2603  of  FIG. 26 . 
     The billing menu display screen  2701  may include a message  2702  indicating an added value obtained when the wireless terminals  102  and  103  simultaneously log in to the content distribution server  106  via the same television receiver  101 . 
       FIG. 27  shows an example of a value-added service where a viewing fee can be split between the users (T. Matsu and M. Kage) of the wireless terminals  102  and  103  logged in to the television receiver  101 . 
     In addition, the aggregated service information sent from the content distribution server  106  includes content list information  2703 , and a message  2704  indicating a viewing fee split for Title 1 in the content list information  2703  is displayed. 
     Further, the billing menu display screen  2701  may include messages  2705  and  2706  indicating details on splitting the fee between the users. In addition, the billing menu display screen  2701  may be configured to display the messages  2705  and  2706  indicating details on splitting the fee as options, allowing the user to select a specific amount from these options. In this case, split payment details  2707  and  2708  of each option may be displayed. 
     In  FIG. 26 , the television receiver  101  displays a billing menu display screen in the above-described process of step S 2603 , and thereafter, sends each operation screen information to each of the wireless terminals  102  and  103  (steps S 2604  and S 2605 ). 
     Each of the wireless terminals  102  and  103  displays the operation screen on each display  308  (steps S 2606  and S 2607 ). 
     &lt;Display Example of Operation Screen&gt; 
       FIGS. 28( a )-( b )  are explanatory drawings showing an example of an operation screen in processes of steps S 2606  and S 2607  of  FIG. 26 . 
       FIG. 28( a )  shows a display example of an operation screen  2801   a  of the wireless terminal  102 , and  FIG. 28( b )  shows a display example of the operation screen  2801   a  of the wireless terminal  103 . 
     In  FIG. 28( a ) , the operation screen  2801   a  may include a message  2802   a  indicating the same items as the content list information  2703  displayed on the television receiver  101 . 
     In addition, the operation screen  2801   a  may be configured to display a message  2803   a  prompting approval of the split payment, display an option  2806   a  indicating the approval and an option  2807   a  indicating rejection of the approval, and allow each user to select the option. 
     Further, an option  2808   a  for changing a split payment amount may be displayed. When the user taps this option  2808   a,  the user (T. Matsu) of the wireless terminal  102  may enter the payment amount in, for example, an operation screen  1301  shown in  FIG. 13( a ) . 
     The example of the operation screen  2801   a  indicates a situation after a tap operation is performed on the option  2808   a  and the payment amount is entered by a method not shown. 
     A message  2804   a  indicating (¥3,000) which is the payment amount of the user (T. Matsu) of the wireless terminal  102  and a message  2805   a  indicating (Y 2 , 000 ) which is a payment amount of the user (M. Kage) of the wireless terminal  103  are displayed. 
     At this time, the payment amount of the user (T. Matsu) of the wireless terminal  102  may be highlighted or the like and displayed such that the payment amount of the user of the wireless terminal  102  can be distinguished from the payment amounts of other users. In addition, for example, a fee paid by the user displayed on a lowermost side and is (M. Kage) in the example of  FIG. 28( a )  may be the remaining amount of the payment amount automatically calculated/obtained by subtracting a total payment amount of the other users from (Y 5 , 000 ) which is a viewing fee of Title 1 to display the message  2805   a.    
     Subsequently, messages  2802   b,    2803   b,    2806   b,    2807   b  and  2808   b  displayed on an operation screen  2801   b  of  FIG. 28( b )  have the same items as the messages  2802   a,    2803   a,    2806   a,    2807   a  and  2808   a  displayed on the operation screen  2801   a  shown in  FIG. 28( a ) . 
     On the other hand, a message  2804   b  indicating (¥2,000) which is a payment amount of the user (M. Kage) of the wireless terminal  103  is displayed at an upper level, and a message  2805   b  indicating (¥3,000) which is a payment amount of another user (T. Matsu) is displayed at a lower level. 
     Namely, a display order may be sorted such that the payment amount of each user of the wireless terminals  102  and  103  is displayed at the uppermost level on the corresponding operation screen. 
     As described above, the aggregated login information obtained by aggregating the pieces of login information of the plurality of users is sent to the content distribution server as one piece of information, so that the payment amount for viewing the for-pay content can be split between the plurality of users. 
     In this manner, it is possible to further improve user-friendliness of the network terminal system. 
     (Fourth Embodiment) 
     &lt;Overview&gt; 
     A fourth embodiment will describe default settings for setting the content shareability and whether or not to split the viewing fee between the users of wireless terminals  102  and  103  for each of the above-described actions of the first to fourth embodiments, that is, for each of the actions in which the wireless terminals  102  and  103  simultaneously access the television receiver  101 . 
     Hereinafter, sharing the content with other users and splitting the viewing fee will be referred to as “shared viewing”. 
     &lt;Setting Example of Default Setting&gt; 
       FIGS. 29( a )-( d )  are explanatory drawings showing an example of default settings information of the wireless terminal  102  or  103  according to the fourth embodiment. 
     The default settings information is stored in a storage  304  of the wireless terminals  102  and  103  of  FIG. 3 . In addition, it is assumed that the default settings information is set by each user utilizing the wireless terminals  102  and  103 . 
       FIG. 29( a )  shows an example of the default settings information for setting viewing shareability  2902  per service division  2901 . The service division  2901  includes identification information for distinguishing each service. 
     In addition, the viewing shareability  2902  includes a flag indicating whether the shared viewing is permitted (YES) or shared viewing is not permitted (NO).  FIG. 29( a )  shows an example in which common movies and games are available for shared viewing and R18-rated movies, that is, movies including inappropriate content for minors under the age of 18, are not available for shared viewing. 
       FIG. 29( b )  shows an example of the default settings information for setting viewing shareability  2904  per content/application division  2903 . 
     The content/application division  2903  includes identification information for distinguishing each provider. In addition, the viewing shareability  2904  includes a flag indicating whether the shared viewing is permitted (YES) or shared viewing is not permitted (NO). 
       FIG. 29( b )  shows an example in which the content of Title A and Title C is available for shared viewing and the content of Title B is not available for shared viewing. 
       FIG. 29( c )  shows an example of default settings information for setting viewing shareability  2906  per provider division  2905  such as a content provider, a network provider or the like. 
     The provider division  2905  includes identification information for distinguishing each provider. In addition, the viewing shareability  2906  includes a flag indicating whether the shared viewing is permitted (YES) or shared viewing is not permitted (NO). 
       FIG. 29( c )  shows an example in which the content and applications whose providers are Company A and Company C are available for shared viewing, and the content and applications whose provider is Company B are not available for shared viewing. 
       FIG. 29( d )  shows an example of default settings information for setting the viewing shareability  2906  per billing destination division  2907 . 
     The content/application division  2903  includes identification information for distinguishing each provider. In addition, the viewing shareability  2908  includes a flag indicating whether the shared viewing is permitted (YES) or shared viewing is not permitted (NO). 
       FIG. 29( d )  shows an example in which the content and applications whose billing destinations are Company A and Company C are available for shared viewing, and the content and applications whose billing destination is Company B are not available for shared viewing. 
     Note that the service division  2901  shown in  FIG. 29( a )  and the content/application division  2903  shown in  FIG. 29( b )  may be extracted by the television receiver  101  from an electronic program guide (EPG) associated with each content sent from the content distribution server  106  and sent to the wireless terminal  102  or extracted by the wireless terminal  102 . 
     The service division  2901  or the content/application division  2903  extracted from each content in this manner is compared with the service division  2901  or the content/application division  2903  stored in the storage  304 . When the service division  2901  or the content/application division  2903  extracted from each content is not yet stored in the storage  304 , the service division  2901  or the content/application division  2903  may be added to the storage  304 . 
     In addition, the provider division  2905  shown in  FIG. 29( c )  and the billing destination division  2907  shown in  FIG. 29( d )  may be added to the storage  304  when signing up with a new provider or billing destination by using the wireless terminal  102 . 
     The wireless terminal  102  stores and maintains these pieces of default settings information in each storage  304 , and the user profile generator  609  generates the profile information of the user of the wireless terminal  102  (step S 1007  of  FIG. 10 ). Further, the wireless terminal  102  sends the profile information to the television receiver  101  (step S 1008  of  FIG. 10 ). Note that the same operations are performed in the wireless terminal  103 . 
     The television receiver  101  refers to each item of viewing shareabilities  2902 ,  2904 ,  2906  and  2908  sent as the profile information and displays the items matching the conditions of “shareability: YES” on the above-described content list display screens  1501  and  1901 , aggregated service display screens  2401  and  2501  and billing menu display screen  2701 . In addition, the television receiver  101  does not display items of “shareability: NO” on each of the screens  1501 ,  1901 ,  2401 ,  2501  and  2701 . 
     &lt;Display Example of Default Settings Screen&gt; 
       FIGS. 30( a )-( b )  are explanatory drawings showing an example of a default settings screen displayed on the wireless terminal  102 . 
     In  FIG. 30( a ) , the default settings screen  3001  displays options  3002 ,  3003 ,  3004  and  3005  for selecting the default settings information shown in  FIGS. 29( a ), 29( b ), 29( c ) and 29( d ) . 
     Namely, the option  3002  is an option for switching to the default settings screen corresponding to  FIG. 29( a ) , and the option  3003  is an option for switching to the default settings screen corresponding to  FIG. 29( b ) . 
     In addition, the option  3004  is an option for switching to the default settings screen corresponding to  FIG. 29( c ) , and the option  3005  is an option for switching to the default settings screen corresponding to  FIG. 29( d ) . 
     The default settings screen  3001  may display an option  3006  for returning to a screen displayed before entering the default settings screen  3001 . When the user of the wireless terminal  102  taps and selects the option  3002  shown in  FIG. 30( a ) , the wireless terminal  102  displays, for example, the default settings screen  3007  shown in  FIG. 30( b ) . 
     In  FIG. 30( b ) , the default settings screen  3007  is a default settings screen corresponding to  FIG. 29( a )  and displays options  3008 ,  3009  and  3010 . 
     In the option  3008 , viewing shareability for common movies is selected according to the preset service division  2901 . In the option  3009 , viewing shareability for R 18 -rated movies is selected, and in the option  3010 , viewing shareability for games is selected. 
     Each of the options  3008 ,  3009  and  3010  includes an option  3011  for selecting one of “Shareability: YES” and “Shareability: NO”. The user of the wireless terminal  102  taps and selects one of “Shareability: YES” and “Shareability: NO” to display the selected result in the option  3011 . 
     In addition, the default settings screen  3007  may display an option  3012  for returning to a screen displayed before entering the default settings screen  3007 , that is, the default settings screen  3001 . 
     Note that the default settings screen displayed when the user selects the options  3003 ,  3004  and  3005  on the default settings screen  3001  shown in  FIG. 30( a )  and actions thereof are the same as the default settings screen and actions thereof described with reference to  FIG. 30( b ) , and thus, illustrations and redundant descriptions will be omitted. 
     In the above-described manner, when the plurality of users perform “shared viewing”, flag information indicating viewing shareability per division is stored and maintained in each wireless terminal of each user, so that the plurality of users can share and view content of the division available for shared viewing without disclosing the items (title, content, or the like) of the division not available for shared viewing. 
     (Fifth Embodiment) 
     &lt;Overview&gt; 
     The present embodiment will describe a technique in which portions (steps S 1001  and  51002 ) in the actions (steps S 1001  to S 1009  of  FIG. 10 ) of exchanging information between the wireless terminal  102  and the television receiver  101  shown in  FIG. 10  are replaced with actions (steps S 3101  to  53104 ) described below. 
     &lt;Example of Actions in Network Terminal System&gt; 
       FIG. 31  is a flowchart showing an example of processes in the network terminal system according to a fifth embodiment. 
       FIG. 31  shows actions in which processes of steps S 1001  and S 1002  in the above-described actions (steps S 1001  to S 1009 ) of exchanging information between the wireless terminal  102  and the television receiver  101  shown in  FIG. 10  are replaced with processes of steps S 3101  to S 3104  of  FIG. 31  described below. Note that the configuration of the network terminal system is the same as that of the first embodiment of  FIG. 1 . 
     In  FIG. 31 , the television receiver  101  activates a “terminal search App” which is a terminal detector (step S 3101 ). The “terminal search App” is an application program which is stored in the storage  216  and broadcasts a connection request (step S 3102 ) to search for a wireless terminal in the same local network capable of accessing the television receiver  101  via a wireless router  104 . The “terminal search App” is activated by a timer (not shown) within the television receiver  101 . The “terminal search App” is activated on a regular basis and may be activated, for example, approximately once every several minutes. 
     Note that the “terminal search App” can be achieved by a generally known technique, and thus, illustrations and detailed descriptions will be omitted. The connection request may include information and device ID which allow the user to identify a device having sent the connection request. The information which allows the user to identify the device is, for example, a model name (AB-C1000) of the television receiver  101 , and the device ID is, for example, 3D:4F:1E: 00 :xx:xx and the like. 
     The wireless terminal  102  having received the connection request determines whether or not the wireless terminal  102  “is connected” to the television receiver  101  in step S 3103 . If the wireless terminal  102  is connected (YES), the wireless terminal  102  returns a connection status response indicating that the wireless terminal  102  is connected to the television receiver  101  and ends the operation. 
     On the other hand, if the wireless terminal  102  is not connected (NO), the network connection confirmation screen is displayed on the display  308  and confirms “whether or not to connect” to the user (step S 3104 ). 
       FIG. 32  is an explanatory drawing showing an example of a network connection confirmation screen  3201  in a process of step S 3104  of  FIG. 31 .  FIG. 32  shows a display example of the network connection confirmation screen  3201  of, for example, the wireless terminal  102 . 
     The network connection confirmation screen  3201  includes a message  3202  indicating that “a connection request has been received from the television receiver”, an option  3203  indicating that “connection approved” and an option  3204  indicating that “connection rejected”. 
     The message  3202  may include information such as the above-described model name (AB-C1000) or device ID (3D:4F:1E: 00 :xx:xx) of the television receiver  101 , allowing the user to identify the device having sent the connection request. 
     When the user selects the option  3203  indicating “approved” (step S 3104 : YES) by a tap operation or the like, a subsequent action of the process of step S 1003  is performed. On the other hand, when the option  3204  indicating “rejected” is selected (step S 3104 : NO), the wireless terminal  102  returns a connection request rejection response to the television receiver  101  and ends the operation. 
     The processes of steps S 1003  to S 1009  shown in  FIG. 31  are the same as the above-described processes of steps S 1003  to S 1009  shown in  FIG. 10 , and thus, redundant descriptions will be omitted. 
     Note that the television receiver  101  may be controlled such that the connection request is not sent to the wireless terminal  102  having returned the connection request rejection response for a certain period of time, such as one hour, in the process of step S 3102 . 
     Alternatively, the wireless terminal  102  having returned the connection request rejection response may be controlled such that the connection rejection request is automatically returned during a certain period of time, such as one hour, even if a connection request is received. 
     In addition, in a case where the television receiver  101  broadcasts the connection request in the process of step S 3102  and no connection status response is sent from the connected wireless terminal  102 , the television receiver  101  may be configured to delete the user profile information obtained from the wireless terminal  102  and automatically perform logout processing in the wireless terminal  102  as in the process of step S 1011  shown in  FIG. 10 . 
     In the above-described manner, the television receiver  101  broadcasts the connection request to the wireless terminal  102  in the same local network, so that the user of the wireless terminal  102  can be saved from the trouble of actively logging in to the television receiver  101 . 
     In this manner, it is possible to further improve user-friendliness of the network terminal system. 
     In the foregoing, the invention made by the present inventors has been concretely described based on the embodiments. However, it goes without saying that the present invention is not limited to the foregoing embodiments, and various modifications can be made within the scope of the present invention. 
     Note that the first to fifth embodiments have described cases where the television receiver and the like comprising a display  210  are utilized; however, the present invention can be achieved in a similar manner by an STB (Set-Top Box), a recorder with a display provided externally or the like. In addition, the foregoing embodiments can be achieved in a similar manner by a monitor apparatus, a large tablet terminal, an interactive whiteboard or the like comprising a communication I/F. 
     Note that the present invention is not limited to the foregoing embodiments and includes various modifications. For example, the foregoing embodiments have been described in detail such that the description of the present invention is easily understandable, and are not necessarily limited to comprise all of the configurations described above. 
     In addition, a portion of the configuration of one of the embodiments can be replaced with the configuration of another embodiment. Further, the configuration of one of the embodiments can be added to the configuration of another embodiment. Furthermore, other configurations may be added to, be removed from or replace a portion of the configuration of each of the embodiments. 
     LIST OF REFERENCE SIGNS 
       101 : television receiver 
       102 : wireless terminal 
       103 : wireless terminal 
       104 : wireless router 
       105 : external network 
       106 : content distribution server 
       107 : broadcast station 
       108 : base station 
       201 : antenna 
       202 : tuner/demodulator 
       203 : station selection controller 
       204 : signal separator 
       205 : audio decoder 
       206 : speaker 
       207 : audio output unit 
       208 : video decoder 
       209 : superimposing unit 
       210 : display 
       211 : video output unit 
       213 : input unit 
       214 : controller 
       215 : memory 
       216 : storage 
       218 : bus 
       301 : tuner/demodulator 
       302 : signal separator 
       303 : memory 
       304 : storage 
       305 : acceleration sensor 
       306 : geomagnetic sensor 
       307 : controller 
       308 : display 
       311 : input unit 
       312 : GPS receiver 
       313 : gyro sensor 
       314 : bus 
       402 : controller 
       403 : memory 
       404 : storage 
       405 : content 
       406 : device authentication information 
       407 : user authentication information 
       408 : bus 
       501 : connection device authentication unit 
       502 : browser engine 
       503 : HTML parser 
       504 : database generator 
       505 : renderer 
       506 : image processor 
       507 : content player 
       508 : various application unit 
       509 : account manager 
       510 : content/application synchronization processor 
       511 : connection device authentication program 
       512 : browser program 
       513 : content playback program 
       514 : various application programs 
       515 : account management program 
       516 : content/application synchronization processing program 
       517 : content 
       601 : connection device authentication unit 
       602 : browser engine 
       603 : HTML parser 
       604 : database generator 
       605 : renderer 
       606 : image processor 
       607 : content player 
       608 : various application unit 
       609 : user profile generator 
       610 : device authentication program 
       611 : browser program 
       612 : content playback program 
       613 : various application programs 
       614 : user profile generation program 
       615 : content 
       701 : user manager 
       702 : content manager 
       703 : content distributor 
       704 : user management program 
       705 : content management program 
       706 : content distribution program