Patent Publication Number: US-10771957-B2

Title: Wireless communication apparatus, communication system and wireless communication apparatus control method to exchange services

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application is a continuation application of U.S. patent application Ser. No. 15/805,187, filed Nov. 7, 2017, which claims priority from U.S. patent application Ser. No. 14/761,103, filed Jul. 15, 2015, now U.S. Pat. No. 9,826,394, which is a National Stage of PCT/JP2013/079966, filed Nov. 6, 2013, and claims the benefit of priority from prior Japanese Patent Application JP 2013-013561, filed Jan. 28, 2013, the entire content of which is hereby incorporated by reference. 
    
    
     TECHNICAL FIELD 
     The present technology relates to a wireless communication apparatus, and more particularly relates to a wireless communication apparatus that transmits and receives data with another wireless communication apparatus using wireless communication, a communication system, a wireless communication apparatus control method, and a program causing a computer to execute the method. 
     BACKGROUND ART 
     In the related art, there exists wireless communication technology in which various data is exchanged using wireless communication. For example, a communication method in which nearby wireless communication apparatuses autonomously interconnect (by ad hoc communication or in an ad hoc network, for example) has been proposed (see Patent Literature 1, for example). 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: 
       
    
     JP 2009-239385A 
     SUMMARY OF INVENTION 
     Technical Problem 
     According to the above technology of the related art, two wireless communication apparatuses are able to exchange various data with each other using wireless communication, without connecting using a wired link. In addition, on such a network, each wireless communication apparatus is able to communicate with nearby wireless communication apparatuses without depending on a master station such as a control apparatus. 
     In this way, it is possible to freely communicate with surrounding wireless communication apparatuses by using wireless communication. However, suppose that among the multiple wireless communication apparatuses present nearby, there exists a wireless communication apparatus used by a known user, and a wireless communication apparatus used by a user who is completely unknown. In such cases, in order to improve safety, it is conceivably more preferable to receive a service provided by the wireless communication apparatus used by the known user. 
     The present technology has been devised in light of such circumstances, and an objective thereof is to easily and safely exchange services using wireless communication among wireless communication apparatuses. 
     Solution to Problem 
     The present technology has been made in order to solve the above problems, and a first aspect thereof is a wireless communication apparatus, a control method thereof, and a program causing a computer to execute the method, the wireless communication apparatus including: a communication unit configured to use wireless communication to transmit and receive data related to a service provided by at least one of the wireless communication apparatus and another wireless communication apparatus with other wireless communication apparatuses present within a designated range; and a control unit configured to associate service information for identifying the service with user information for identifying a user using a wireless communication apparatus that provides the service, and include and transmit the associated information in the data. Accordingly, such a configuration acts to associate service information for identifying a service with user information for identifying a user using a wireless communication apparatus that provides the service, include the associated information in data, and transmit the data. 
     In the first aspect, when the data is received, the control unit may judge, on the basis of the user information included in the data, whether or not to receive a service according to the service information associated with the user information from another wireless communication apparatus according to the user information. Accordingly, such a configuration acts to judge, on the basis of user information included in received data, whether or not to receive a service according to the service information associated with the user information from another wireless communication apparatus according to the user information. 
     In the first aspect, the control unit may judge whether or not to receive the service, on the basis of whether or not the user information included in the received data matches the user information registered in an allow list. Accordingly, such a configuration acts to judge whether or not to receive a service, on the basis of whether or not user information included in received data matches user information registered in an allow list. 
     In the first aspect, the control unit may judge whether or not to receive the service, on the basis of a result of a match determination using the allow list stored in a storage unit or the allow list stored in an external apparatus. Accordingly, such a configuration acts to judge whether or not to receive a service, on the basis of a result of a match determination using an allow list stored in a storage unit or an allow list stored in an external apparatus. 
     In the first aspect, the control unit may judge whether or not to receive the service, on the basis of whether or not the user information included in the received data matches the user information registered in a blocked list. Accordingly, such a configuration acts to judge whether or not to receive a service, on the basis of whether or not user information included in received data matches user information registered in a blocked list. 
     In the first aspect, the control unit may include, in the data, and transmit first user information which is the user information according to a user using the wireless communication apparatus, and second user information which is the user information included in the data transmitted from another wireless communication apparatus, and also the user information according to a user using the other wireless communication apparatus. Accordingly, such a configuration acts to include first user information and second user information in data and transmit the data. 
     In the first aspect, the control unit may include only the second user information for which forwarding is allowed in the data and transmits the data. Accordingly, such a configuration acts to include only second user information for which forwarding is allowed in data and transmit the data. 
     A second aspect of the present technology is a wireless communication apparatus, a control method thereof, and a program causing a computer to execute the method, the wireless communication apparatus including: a communication unit configured to transmit and receive data related to a service provided by at least one of the wireless communication apparatus and another wireless communication apparatus, the data including information associating service information for identifying the service with user information for identifying a user using a wireless communication apparatus that provides the service; and a control unit that, when the data is received, judges, on the basis of the user information included in the data, whether or not to receive a service according to the service information associated with the user information from another wireless communication apparatus according to the user information. Accordingly, when data is received, such a configuration acts to judge, on the basis of user information included in the data, whether or not to receive a service according to the service information associated with the user information from another wireless communication apparatus according to the user information. 
     A third aspect of the present technology is a communication system, a control method thereof, and a program causing a computer to execute the method, the communication system including: a first wireless communication apparatus provided with a communication unit configured to use wireless communication to transmit and receive data related to a service provided by at least one of the wireless communication apparatus and another wireless communication apparatus with other wireless communication apparatuses present within a designated range, and a control unit configured to associate service information for identifying the service with user information for identifying a user using a wireless communication apparatus that provides the service, and include and transmit the associated information in the data; and a second wireless communication apparatus provided with a communication unit that transmits and receives the data, and a control unit that, when the data is received, judges, on the basis of the user information included in the data, whether or not to receive a service according to the service information associated with the user information from another wireless communication apparatus according to the user information. Accordingly, an effect is realized in which a first wireless communication apparatus associates service information for identifying a service with user information for identifying a user using a wireless communication apparatus that provides the service, includes and transmits the associated information in data, while a second wireless communication apparatus judges, on the basis of the user information included in the data, whether or not to receive the service according to the service information associated with the user information from another wireless communication apparatus according to the user information. 
     Advantageous Effects of Invention 
     According to the present technology, the advantageous effect of being able to easily and safely exchange services using wireless communication among wireless communication apparatuses may be achieved. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram that illustrates an exemplary system configuration of a communication system  100  according to a first embodiment of the present technology. 
         FIG. 2  is a block diagram illustrating an exemplary internal configuration of a first wireless communication apparatus  200  according to the first embodiment of the present technology. 
         FIG. 3  is a diagram that schematically illustrates an example of managed content in a user information management table  310  stored in memory  300  according to the first embodiment of the present technology. 
         FIG. 4  is a diagram that schematically illustrates an example of managed content in a friend list management table  320  stored in memory  300  according to the first embodiment of the present technology. 
         FIG. 5  is a diagram that schematically illustrates an example of managed content in a blocked list management table  330  stored in memory  300  according to the first embodiment of the present technology. 
         FIG. 6  is a diagram illustrating a transmission example in a case in which each wireless communication apparatus constituting a communication system  100  according to the first embodiment of the present technology transmits discovery information. 
         FIGS. 7A and 7B  are diagrams illustrating an example format of a beacon transmitted by each wireless communication apparatus constituting a communication system  100  according to the first embodiment of the present technology. 
         FIG. 8  is a diagram illustrating an example format of a beacon transmitted by each wireless communication apparatus constituting a communication system  100  according to the first embodiment of the present technology. 
         FIG. 9  is a diagram illustrating an example of a display screen (registration screen  350 ) displayed on a display unit  280  according to the first embodiment of the present technology. 
         FIG. 10  is a sequence flowchart illustrating an exemplary communication process among apparatuses constituting a communication system  100  according to the first embodiment of the present technology. 
         FIG. 11  is a sequence flowchart illustrating an exemplary communication process among apparatuses constituting a communication system  100  according to the first embodiment of the present technology. 
         FIG. 12  is a flowchart illustrating an example of a processing sequence of a user information registration process by a first wireless communication apparatus  200  according to the first embodiment of the present technology. 
         FIG. 13  is a flowchart illustrating an example of a processing sequence of a data communication process by a first wireless communication apparatus  200  according to the first embodiment of the present technology. 
         FIG. 14  is a diagram that illustrates an exemplary system configuration of a communication system  400  according to a modification of the first embodiment of the present technology. 
         FIG. 15  is a diagram that schematically illustrates an example of managed content in a friend list management database  411  stored in memory  300  according to a modification of the first embodiment of the present technology. 
         FIG. 16  is a flowchart illustrating an example of a processing sequence of a data communication process by a first wireless communication apparatus  200  according to a modification of the first embodiment of the present technology. 
         FIG. 17  is a diagram illustrating an example format of a beacon transmitted by each wireless communication apparatus constituting a communication system  100  according to a second embodiment of the present technology. 
         FIG. 18  is a diagram illustrating an example format of a beacon transmitted by each wireless communication apparatus constituting a communication system  100  according to the second embodiment of the present technology. 
         FIG. 19  is a diagram that schematically illustrates a flow of discovery information transmitted and received in a communication system  100  according to the second embodiment of the present technology. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments for carrying out the present technology (hereinafter designated embodiments) will be described. The description will proceed in the following order.
     1. First embodiment (communication control: example of judging whether or not to receive service on the basis of user information included in discovery information)   2. Second embodiment (communication control: example of including user information of local apparatus and other apparatus in discovery information to transmit data)   

     1. First Embodiment 
     [Exemplary Configuration of Communication System] 
       FIG. 1  is a diagram that illustrates an exemplary system configuration of a communication system  100  according to a first embodiment of the present technology. Note that in some of the drawings, wireless communication apparatuses are each abbreviated as “W. C. A.” for convenience. 
     The communication system  100  is equipped with a plurality of wireless communication apparatuses (first wireless communication apparatus  200 , second wireless communication apparatus  102 , third wireless communication apparatus  103 , and so on to a 13th wireless communication apparatus  113 ). Each wireless communication apparatus (device) constituting the communication system  100  is, for example, a portable information processing apparatus (such as a smartphone, mobile phone, or tablet, for example), or a stationary information processing apparatus (such as a printer or personal computer, for example). 
     Herein, ad hoc communication, ad hoc networks, and the like are known as communication methods in which nearby wireless communication apparatuses autonomously interconnect. On such a network, each wireless communication apparatus is able to communicate with nearby wireless communication apparatuses without depending on a master station (for example, a control apparatus). Accordingly, an embodiment of the present technology will be described by taking an ad hoc network as an example of a communication method in which nearby wireless communication apparatuses autonomously interconnect. 
     On an ad hoc network, if a new wireless communication apparatus is added nearby, the new wireless communication apparatus is also able to freely join the network. For example, suppose a case in which, at first, only the first wireless communication apparatus  200 , the second wireless communication apparatus  102 , the third wireless communication apparatus  103 , and so on to the eighth wireless communication apparatus  108  have joined the ad hoc network from among the wireless communication apparatuses illustrated in  FIG. 1 . In this case, suppose that the ninth wireless communication apparatus  109  to the 13th wireless communication apparatus  113  are successively added. In this case, the network coverage may be increased as these wireless communication apparatuses (nearby wireless communication apparatuses) increase. In other words, the network coverage may be increased as the ninth wireless communication apparatus  109  to the 13th wireless communication apparatus  113  are successively added. 
     Herein, besides autonomously interconnecting with nearby wireless communication apparatuses, each wireless communication apparatus is also able to forward information to be exchanged with another wireless communication apparatus in a bucket relay manner. 
     For example, suppose that the first wireless communication apparatus  200  is able to communicate directly with each of the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104 , but is unable to communicate directly with the other wireless communication apparatuses because of factors such as limited radio range. In  FIG. 1 , the range over which the first wireless communication apparatus  200  may communicate directly (the transmission range based on the first wireless communication apparatus  200 ) is indicated as a transmission range  121 . Note that the transmission range  121  corresponds to the transmission range in the case of limiting the forwarding (hop) count to one time. 
     Even when direct communication is unavailable in this way, a wireless communication apparatus capable of communicating directly with the first wireless communication apparatus  200  (the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104 ) is able to forward data from the first wireless communication apparatus  200  to another wireless communication apparatus. Accordingly, by forwarding data in this way, it becomes possible for the first wireless communication apparatus  200  and a wireless communication apparatus that is unable to communicate directly with the first wireless communication apparatus  200  to exchange information with each other. For example, it becomes possible for the first wireless communication apparatus  200  and the fifth wireless communication apparatus  105  that is unable to communicate directly with the first wireless communication apparatus  200  to exchange information with each other via the third wireless communication apparatus  103  (or the fourth wireless communication apparatus  104 ). 
     A method that conducts mutual data forwarding (also called a bucket relay) in this way and delivers information to distance wireless communication apparatuses is designated a multi-hop relay. Also, a network that conducts multi-hop is typically known as a mesh network. 
       FIG. 2  illustrates a configuration of a wireless communication apparatus constituting such an ad hoc network or mesh network. 
     A multi-hop relay used in an embodiment of the present technology will now be described. 
     As an example, a procedure will be described in which a mesh network is formed as illustrated in  FIG. 1 , and the first wireless communication apparatus  200  communicates with the fifth wireless communication apparatus  105 . 
     The first wireless communication apparatus  200 , before starting communication with the fifth wireless communication apparatus  105 , specifies which communication route to use (which wireless communication apparatus to traverse). For example, the first wireless communication apparatus  200  exchanges communication routing information with each neighboring wireless communication apparatus, on the basis of a procedure conforming to an established communication routing protocol. 
     For example, a procedure determined by the standard of the Optimized Link State Routing Protocol (OLSR) of RFC 3626 published by the IETF may be used. As another example, a procedure determined by a standard such as the IEEE Standard for Information Technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, Amendment 10: Mesh Networking (commonly known as IEEE 802.11s) published by the IEEE may be used. 
     On the basis of these procedures, the first wireless communication apparatus  200  is able to detect that communication with the fifth wireless communication apparatus  105  is possible by traversing the third wireless communication apparatus  103 , without needlessly wasting radio resources. For example, it is possible to detect that communication is possible without needless waste, on the basis of factors such as a small number of relay nodes, minimal transmission delay, and minimal time occupying a frequency channel for transmission. 
     The information used for the detection is held internally in each wireless communication apparatus as communication route information, and when a packet is actually transmitted or received, the information is referenced to search for which wireless communication apparatus the packet should be transmitted to next in order to make the packet reach the final destination. 
     In the procedure discussed above, the first wireless communication apparatus  200  acquires communication route information that is valid up to the fifth wireless communication apparatus  105 . Subsequently, on the basis of the acquired communication route information, the first wireless communication apparatus  200  transmits a packet addressed to the fifth wireless communication apparatus  105  to the third wireless communication apparatus  103 . The third wireless communication apparatus  103  receives the packet, and on the basis of internally held communication route information, forwards the received packet addressed to the fifth wireless communication apparatus  105  to the fifth wireless communication apparatus  105 . 
     Note that the creation of the above communication route information is also conducted with respect to all wireless communication apparatuses connected to the mesh network in some cases. However, in some cases, such as when there is an extremely large number of wireless communication apparatuses present on the network, the overhead related to the creation of communication route information increases due to factors such as control packets. Accordingly, to reduce the overhead related to the creation of communication route information due to factors such as control packets, a limit on the number of times that each packet is forwarded may be imposed as discussed earlier, for example. 
     At this point, suppose that in the example illustrated in  FIG. 9 , a music service is received from the fifth wireless communication apparatus  105  via the third wireless communication apparatus  103 , as indicated by the arrow  131 . In addition, suppose that an image service is received from the seventh wireless communication apparatus  107  via the fourth wireless communication apparatus  104 , as indicated by the arrow  132 . 
     In addition, a setup that uses an ad hoc network or mesh network to circulate content while freely communicating with nearby apparatus is conceivable. In order to realize such a setup, it is necessary to announce to nearby apparatus which wireless communication apparatus is holding which content and is able to supply content. 
     For example, as illustrated in  FIGS. 7A and 7B , by including discovery information (service information  157 ) in a beacon periodically transmitted by each wireless communication apparatus, it is possible to announce to nearby equipment the services providable by each wireless communication apparatus. In addition, by searching for beacons, each wireless communication apparatus is able to discover wireless communication apparatuses present nearby. In this case, it is also possible to detect what kinds of services are provided by the discovered wireless communication apparatus. 
     At this point, suppose that among the multiple wireless communication apparatuses present nearby, there exists a wireless communication apparatus used by a known user, and a wireless communication apparatus used by a user who is completely unknown. For this reason, when receiving a service, for example, it is possible to receive the service from the wireless communication apparatus being used by the known user, and it is also possible to receive the service from the wireless communication apparatus being used by the completely unknown user. In such cases, in order to improve safety, it is conceivably more preferable to receive a service provided by the wireless communication apparatus used by the known user. Accordingly, in an embodiment of the present technology, user information (the user information  158  illustrated in  FIGS. 7A  and  7 B) is included in the discovery information and transmitted, and it is judged whether or not to receive a service on the basis of the user information. 
     Herein, discovery information is information that is used when discovering a service that another wireless communication apparatus is able to provide (information for reporting the services provided by each wireless communication apparatus). For example, the service information  157  and the user information  158  illustrated in  FIGS. 7A and 7B  correspond to discovery information. Note that service information and user information will be described in detail with reference to  FIGS. 7A and 7B . In addition, discovery information may also be understood as service discovery information. 
     [Exemplary Configuration of Wireless Communication Apparatus] 
       FIG. 2  is a block diagram illustrating an exemplary internal configuration of a first wireless communication apparatus  200  according to the first embodiment of the present technology. Note that since the internal configuration of other wireless communication apparatuses is the same as the first wireless communication apparatus  200 , herein, only the first wireless communication apparatus  200  will be described, and description of the other wireless communication apparatuses will be omitted. 
     The first wireless communication apparatus  200  is equipped with antenna  210 , a communication unit  220 , an input/output (I/O) interface  230 , a control unit  240 , and memory  300 . In addition, these components are connected via a bus  250 . 
     The communication unit  220  is a module for transmitting and receiving radio waves via the antenna  210  (a modem, for example). For example, the communication unit  220  is able to conduct wireless communication via millimeter wave communication (such as 60 GHz), 5 GHz wireless local area network (LAN), or ultra wideband (UWB). As another example, the communication unit  220  is able to conduct wireless communication via visible light communication or near field communication (NFC). 
     For example, the communication unit  220 , on the basis of control by the control unit  240 , uses wireless communication to transmit and receive discovery information (the service information  157  and the user information  158  illustrated in  FIGS. 7A and 7B ) with other wireless communication apparatuses present within a predetermined range. In addition, the communication unit  220 , on the basis of control by the control unit  240 , uses wireless communication to transmit and receive data related to services provided by each wireless communication apparatus with other wireless communication apparatuses present within a predetermined range. In this case, the communication unit  220  is also able to forward data related to services provided by one wireless communication apparatus to another wireless communication apparatus. In other words, the communication unit  220  is able to use wireless communication to transmit and receive data related to a service provided by at least one of the first wireless communication apparatus  200  and another wireless communication apparatus to other wireless communication apparatuses present within a predetermined range. Herein, suppose that the predetermined range is a range based on the position of the first wireless communication apparatus  200 , for example, and means a range in which the communication unit  220  is able to transmit and receive data using wireless communication. In addition, suppose that another wireless communication apparatus present within the predetermined range is a wireless communication apparatus adjacent to the first wireless communication apparatus  200 , for example, and is a wireless communication apparatus that is able to transmit and receive data with the first wireless communication apparatus  200  using wireless communication. 
     Note that the communication unit  220  may be configured to conduct wireless communication using radio waves (electromagnetic waves), and may also be configured to conduct wireless communication using a medium other than radio waves (for example, wireless communication conducted using a magnetic field). 
     In addition, the communication unit  220  establishes a communication link and conducts bidirectional communication with adjacent wireless communication apparatuses, and in addition, manages the number of adjacent wireless communication apparatuses able to communicate with the first wireless communication apparatus  200 , and stores information indicating the number of adjacent wireless communication apparatuses that are able to communicate (communicable count information). In addition, the communication unit  220  periodically or non-periodically observes the occupancy of the channel used for wireless communication, and stores information indicating the degree to which the communication links around the first wireless communication apparatus  200  are congested (congestion information). In addition, the communication unit  220  observes the link quality (such as the received signal power and transmittable data rate) with adjacent wireless communication apparatuses conducting wireless communication, and stores information indicating how much bandwidth is available for wireless communication with an adjacent wireless communication apparatus (communication status information). Subsequently, the communication unit  220  supplies the respective information to the control unit  240 . 
     [Exemplary Configuration of Wireless Communication Apparatus] 
     The I/O interface  230  is an interface with external apparatus such as sensors and actuators that operate in conjunction with the first wireless communication apparatus  200 .  FIG. 2  illustrates an example in which a movement detection unit  260 , an operation receiving unit  270 , a display unit  280 , and an audio output unit  290 , for example, are connected to the I/O interface  230  as external apparatus. Also, although  FIG. 2  illustrates an example of providing the movement detection unit  260 , the operation receiving unit  270 , the display unit  280 , and the audio output unit  290  externally to the first wireless communication apparatus  200 , some or all of these may also be built into the first wireless communication apparatus  200 . 
     The movement detection unit  260  detects movement of the first wireless communication apparatus  200  by detecting properties such as the acceleration, motion, and orientation of the first wireless communication apparatus  200 , and outputs movement information related to the detected movement to the control unit  240  via the I/O interface  230 . For example, the movement detection unit  260  stores, and supplies to the control unit  240 , movement information indicating whether or not the first wireless communication apparatus  200  has moved location (a log (or real-time information related to the movement)). For the movement detection unit  260 , an acceleration sensor, a gyro sensor, and a Global Positioning System (GPS) receiver may be used, for example. For example, the movement detection unit  260  may use position information detected using GPS (for example, latitude and longitude) to compute the movement distance of the first wireless communication apparatus  200  (for example, the movement distance per unit time). 
     The operation receiving unit  270  is an operation receiving unit that receives operating input performed by a user, and outputs operating information corresponding to received operating input to the control unit  240  via the I/O interface  230 . The operation receiving unit  270  is realized with a touch panel, keyboard, or mouse, for example. 
     The display unit  280  is a display unit that displays various information (for example, the registration screen  350  illustrated in  FIG. 9 ) on the basis of control by the control unit  240 . Note that for the display unit  280 , a display panel such as an organic electroluminescence (EL) panel or a liquid crystal display (LCD) panel may be used, for example. Note that the operation receiving unit  270  and the display unit  280  may also be integrated by using a touch panel that enables a user to perform operating input by bringing a finger in contact with or in proximity to a display screen. 
     The audio output unit  290  is an audio output unit (for example, a speaker) that outputs various audio on the basis of control by the control unit  240 . 
     The controller  240  controls the operation of each component of first wireless communication apparatus  200  on the basis of a control program stored in the memory  300 . For example, the control unit  240  conducts signal processing on transmitted and received information. Also, the control unit  240  is realized by a central processing unit (CPU). 
     The memory  300  is memory that stores various information. For example, various information (for example, a control program) required for the first wireless communication apparatus  200  to conduct desired operation is stored in the memory  300 . In addition, various content such as music content and image content (for example, moving image content and still image content) are stored in a content storage area of the memory  300 . 
     In addition, a user information management table  310  for managing user information (illustrated in  FIG. 3 ) and a friend list management table  320  for managing a friend list (illustrated in  FIG. 4 ) are stored in the memory  300 . In addition, a blocked list management table  330  for managing a blocked list (illustrated in  FIG. 5 ) is stored in the memory  300 . 
     For example, when transmitting data using wireless communication, the control unit  240  processes information read out from the memory  300 , a signal input from the I/O interface  230 , or the like, and generates a chunk of data (transmission packet) to actually transmit. Subsequently, the control unit  240  outputs the generated transmission packet to a communication unit  220 . Also, the communication unit  220 , after converting the transmission packet into the format of a communication scheme for actual transmission and the like, externally transmits the converted transmission packet from an antenna  210 . 
     As another example, when receiving data using wireless communication, the communication unit  220  extracts a received packet by having a receiver built into the communication unit  220  perform signal processing on a radio signal received via an antenna  210 . Subsequently, the control unit  240  interprets the extracted and received packet. If, as a result of the interpretation, the extracted and received packet is judged to be data that should be stored, the control unit  240  writes the data to the memory  300 . Further, if the extracted and received packet is judged to be data that should be forwarded to another wireless communication apparatus, the control unit  240  outputs the data to the communication unit  220  as a transmission packet to be forwarded to another wireless communication apparatus. Also, if the extracted and received packet is judged to be data that should be forwarded to an external actuator, the control unit  240  externally outputs the data from the I/O interface  230  (for example, to the display unit  280 ). 
     For example, the control unit  240  may provide various content stored in the memory  300  to another wireless communication apparatus using wireless communication. Also, the control unit  240  generates user information (the user information  158  illustrated in  FIGS. 7A and 7B ) on the basis of the user information management table  310  in the memory  300 , and transmits discovery information including the generated user information to another wireless communication apparatus. 
     Note that when the first wireless communication apparatus  200  is driven by a battery, a battery is installed onboard the first wireless communication apparatus  200  (either built-in or inserted). In this case, the control unit  240  is equipped with a function of estimating the remaining battery level, and is able to acquire the estimated remaining battery level on demand. 
     [Example Content of User Information Management Table] 
       FIG. 3  is a diagram that schematically illustrates an example of managed content in a user information management table  310  stored in memory  300  according to the first embodiment of the present technology. 
     The user information management table  310  is a table for managing information related to users who use the first wireless communication apparatus  200  (user information). Herein, it is anticipated that the first wireless communication apparatus  200  may also be used by multiple users (a family, for example). For this reason,  FIG. 3  illustrates an example of the user information management table  310  managing user information related to multiple users. 
     Herein, user information is information for identifying a user who uses the first wireless communication apparatus  200 . In addition, user information may also be understood as owner information. In addition, user information has a one-to-one correspondence with service information (the service information  157  illustrated in  FIGS. 7A and 7B ). 
     Specifically, in the user information management table  310 , management information  311 , a name  312 , an identifier (ID) class  313 , a user ID  314 , and related information  315  are stored in association with each other. Note that  FIG. 3  illustrates an example registration in which user information related to four family members (father, mother, daughter, son) is registered. 
     The management information  311  is information for managing, in units of users, user information to be registered. 
     The name  312  stores a name for identifying a user (for example, a personal name or a nickname). For example, the name  312  stores a name from an input operation by a user. 
     The ID class  313  stores an identifier indicating the class of the user ID. Also, the ID class is a unique ID across the entire system. In  FIG. 3 , for example, the ID class of an email address is expressed as “0x0001”, the ID class of an account for a short message information service is expressed as “0x001e”, and the ID class specific to a location is expressed as “0x003f”. Note that the ID class specific to a location is, for example, an ID used at the location where the user is present, and may be an employee ID number or a student ID number, for example. 
     The user ID  314  stores, for each ID class  313 , an ID for identifying the user (identification information (for example, information made up of letters, numbers, and symbols)). For example, “xxx@foo.org” (email address) is stored as the user ID  314  corresponding to the ID class  313  “0x0001”. 
     The related information  315  stores various information related to the user. For example, information for identifying the user (for example, an image or code for identifying the user) is stored. For example, a person may be identified by causing the information stored in the related information  315  to be displayed on another wireless communication apparatus. 
     A method of registering user information in the user information management table  310  will now be described. For example, registration in the user information management table  310  may be conducted according to input operations by the user. For example, when a user inputs some kind of ID into an application running on the first wireless communication apparatus  200 , the input ID may be acquired and registered as a user ID. This registration example will be described in detail with reference to  FIG. 12 . In addition, it is also possible to write user information to the user information management table  310  during the process of manufacturing the first wireless communication apparatus  200 . In this case, the first wireless communication apparatus  200  is shipped in a state in which user information is registered in the user information management table  310 . 
     In addition, when the first wireless communication apparatus  200  is shared among multiple people, an ID for identifying a user or a user group may also be conceivably registered as a user ID. For example, on a tablet used by a family, it is possible for an ID for identifying the family to be registered as a user ID. The user ID in this case functions as an ID for identifying all users constituting the family (for example, father, mother, daughter, son). 
     Note that although  FIG. 3  illustrates an example of collectively managing multiple users with the user information management table  310 , a user information management table may also be prepared for each user, and each user may be managed separately. 
     In addition, it is also possible to modify user information stored in the user information management table  310  according to externally given information. 
     [Example Content of Friend List Management Table] 
       FIG. 4  is a diagram that schematically illustrates an example of managed content in a friend list management table  320  stored in memory  300  according to the first embodiment of the present technology. 
     The friend list management table  320  is a table for managing a list (friend list) of peers (for example, friends and acquaintances of the user) permitted to use the first wireless communication apparatus  200  to receive various services. Herein, the friend list is a list used when judging whether or not user information transmitted from an adjacent wireless communication apparatus has a relationship with a user (or owner) who uses the first wireless communication apparatus  200 . In other words, the friend list may be understood as an allow list. 
     Specifically, in the friend list management table  320 , an ID class  321 , a user ID  322 , and communication history information  323  are sorted by each ID class and stored in association with each other. 
     The ID class  321  stores an identifier indicating the class of the user ID. Note that the ID class  321  corresponds to the ID class  313  illustrated in  FIG. 3 . 
     The user ID  322  stores, for each ID class  321 , a user ID for identifying the user. Note that the user ID  322  corresponds to the user ID  314  illustrated in  FIG. 3 . 
     The communication history information  323  stores information (communication history information) related to communication conducted with a wireless communication apparatus used by a user whose user ID is stored in the user ID  322 . In the communication history information  323 , communication times and communication durations are successively logged, for example. Note that the communication history information  323  may also be configured to log only the most recent communication history information. 
     Herein, registration in the friend list management table  320  is conducted according to an input operation by the user, or a registration operation by the user using user information included in received discovery information. Note that the registration operation using user information included in discovery information will be described in detail with reference to  FIG. 9 . 
     In addition, registration in the friend list management table  320  may also be conducted according to a result of querying an external database (for example, the friend list management database  411  illustrated in  FIG. 14 ). For example, if a user is determined to have a relationship with a user who uses the first wireless communication apparatus  200  as a result of querying an external database, the user information related to that user may be registered automatically in the friend list management table  320 . 
     Note that the number of entries in the friend list management table  320  is also expected to become larger than necessary. In such cases, on the basis of the communication history information stored in the communication history information  323 , the user IDs with the oldest last communication time may be successively removed from among the user IDs stored in the user ID  322 . Consequently, the number of entries in the friend list management table  320  may be kept within a designated value. 
     Note that although  FIG. 4  illustrates an example in which the first wireless communication apparatus  200  is provided with one friend list, a friend list may also be created and used for each of multiple users (for example, a family). In this way, when using a friend list for each of multiple users, the friend list to use for a determination process (for example, the processing in step S 912  illustrated in  FIG. 13 ) is changed according to the user who is actually using the first wireless communication apparatus  200 . 
     In addition, a friend list management table categorized according the type of friend (such as the closeness of a friend (for example, close friends and not particularly close friends), friends from work, and friends from school, for example) may also be created and used. In this case, one friend list management table may be created for each user, or one friend list management table may be created for multiple people. In addition, multiple friend list management tables may also be created according to the type of friend. When categorizing friends in this way, for example, different processes may be conducted when permitting the receiving of various services, depending on the type of friend (for example, automatic permission, or permission only when a designated condition is satisfied). 
     [Example Content of Blocked List Management Table] 
       FIG. 5  is a diagram that schematically illustrates an example of managed content in a blocked list management table  330  stored in memory  300  according to the first embodiment of the present technology. 
     The blocked list management table  330  is a table for managing peers (for example, persons unknown to the user) blocked from using the first wireless communication apparatus  200  to receive various services. Note that the blocked list may also be referred to as a blacklist. 
     Specifically, in the blocked list management table  330 , an ID class  331  and a user ID  332  are stored in association with each other. 
     Note that the ID class  331  and the user ID  332  correspond to the ID class  321  and the user ID  322  illustrated in  FIG. 4 . 
     Herein, registration in the blocked list management table  330  is conducted according to an input operation by the user, or a registration operation by the user using user information included in received discovery information. Note that the registration operation using user information included in discovery information will be described in detail with reference to  FIG. 9 . 
     In addition, registration in the blocked list management table  330  may also be conducted according to registered content in the friend list management table  320 . For example, on the basis of registered content in the friend list management table  320 , if a user is determined to not have a relationship with a user who uses the first wireless communication apparatus  200 , the user information related to that user may be registered automatically in the blocked list management table  330 . 
     In addition, registration in the blocked list management table  330  may also be conducted according to a result of querying an external database (for example, the friend list management database  411  illustrated in  FIG. 14 ). For example, if a user is determined to not have a relationship with a user who uses the first wireless communication apparatus  200  as a result of querying an external database, the user information related to that user may be registered automatically in the blocked list management table  330 . 
     [Example Transmission of Discovery Information] 
       FIG. 6  is a diagram illustrating a transmission example in a case in which each wireless communication apparatus constituting a communication system  100  according to the first embodiment of the present technology transmits discovery information. 
       FIG. 6  illustrates an example of periodically (or non-periodically) transmitting a beacon (beacon signal) including discovery information. Also,  FIG. 6  illustrates an example of beacon transmission with the horizontal axis representing the time axis. In other words,  FIG. 6  diagrammatically illustrates beacons  141  to  143  successively transmitted in a time series. 
     Herein, discovery information is information that is used when discovering a service that another wireless communication apparatus is able to provide, and is the local apparatus service information  157  and the other apparatus service information  158  illustrated in  FIGS. 7A and 7B , for example. 
     Note that although an embodiment of the present technology illustrates an example of including and transmitting service information and user information, in association with each other, in a beacon, the service information and the user information may also be included in different signals and transmitted. 
     [Example Format of Discovery Information] 
       FIGS. 7A, 7B, and 8  are diagrams illustrating an example format of a beacon transmitted by each wireless communication apparatus constituting a communication system  100  according to the first embodiment of the present technology. Note that  FIG. 7A  illustrates an example format of service information  157  included in beacon information  153 , while  FIG. 7B  illustrates an example format of user information  158  included in beacon information  153 . Also,  FIG. 8  illustrates example content of a service announcement field included in the service information  157 . 
     The beacon  150  includes a preamble  151 , a header  152 , and beacon information  153 . 
     The preamble  151  is information indicating the existence of a packet (beacon). In other words, each wireless communication apparatus constituting the communication system  100  is able to detect the existence of a beacon by receiving the preamble  151 . 
     The header  152  is placed in a predetermined position of the packet, and stores information related to the packet (beacon) itself. For example, the header  152  stores information such as the source, destination, and size of the packet (information related to the packet (beacon) itself). In other words, each wireless communication apparatus constituting the communication system  100  decodes and analyzes the header. As a result of this analysis, each wireless communication apparatus constituting the communication system  100  is able to detect which wireless communication apparatus transmitted a signal addressed to which wireless communication apparatus, and also the signal type of the signal (such as whether or not the signal is a beacon). 
     The beacon information  153  is information to announce to each wireless communication apparatus constituting the communication system  100 . In other words, each wireless communication apparatus constituting the communication system  100  includes and transmits information that should be announced to other wireless communication apparatuses in the beacon. 
     Next, the beacon information  153  will be described in detail. 
     The beacon information  153  includes time information  154 , a network ID  155 , a network attribute  156 , service information  157 , user information  158 , and other information  159 . 
     The time information  154  is time information indicating the time at which the beacon that includes the information was transmitted from the source wireless communication apparatus. 
     The network ID  155  is information indicating an ID of the network constituted by the source wireless communication apparatus. 
     The network attribute  156  is information indicating an attribute of the network constituted by the source wireless communication apparatus. 
     The service information  157  is information related to a service provided by the source wireless communication apparatus (service information). 
     The user information  158  is information related to a user who uses the source wireless communication apparatus (user information). 
     The other information  159  is information other than the above information. 
     Next, the service information  157  and the user information  158  will be described. 
     As illustrated in  FIG. 7A , the service information  157  is made up of information fields, namely an element ID  160 , a length  161 , and service announcement fields [ 0 ] to [N]  162 . 
     The element ID  160  is an element ID indicating that service information is stored. 
     The length  161  is a length indicating the length of the service information element. 
     The service announcement fields [ 0 ] to [N]  162  are made up of one or a plurality of (for example, N) service announcement fields. One service announcement field is placed for each service provided by the corresponding wireless communication apparatus. For example, three fields are placed for a wireless communication apparatus that provides three services. 
     The service announcement fields [ 0 ] to [N]  162  store a service type  163 , a content ID  164 , a content attribute  165 , ranking information  166 , a cache recommendation  167 , a clone degree  168 , and redistribution information  169 . Note that each piece of information will be described in detail with reference to  FIG. 8 . 
     As illustrated in  FIG. 7B , the user information  158  is made up of information fields, namely an element ID  170 , a length  171 , and IDs [ 0 ] to [M]  172 . 
     The element ID  170  is an element ID indicating that user information is stored. 
     The length  171  is a length indicating the length of the user information element. The user ID fields [ 0 ] to [M]  172  are made up of one or a plurality of (for example, M) user ID fields. One user ID field is placed for each user ID registered by a user who uses the corresponding wireless communication apparatus. For example, there are placed a number of fields equal to the number of user IDs stored in the user ID  314  of the user information management table  310  illustrated in  FIG. 3 . 
     At this point, as illustrated in  FIG. 3 , the user information of multiple users may be registered in the user information management table  310 . In this case, it may be configured so that only the user ID registered by the user who is actually using the first wireless communication apparatus  200  is transmitted. In other words, only a user ID field related to the user ID registered by the user who is actually using the first wireless communication apparatus  200  is placed. 
     The user ID fields [ 0 ] to [M]  172  store an ID class  173 , a user ID  174 , and related information  175 . Herein, each of the ID class  173 , the user ID  174 , and the related information  175  stores each of the ID class  313 , the user ID  314 , and the related information  315  illustrated in  FIG. 3 , respectively. 
     Next, the service announcement field will be described with reference to  FIG. 8 . 
     The service type  163  is information for identifying the details of a service (such as content delivery). In addition, the service type  163  may also include information (limitation information to limit the forwarding count) indicating how many more times the discovery information may be forwarded. By including this limitation information, it is possible to prevent the service discovery information related to a service from being forwarded a number of times exceeding the count. Also, a wireless communication apparatus that receives the discovery information may also decide, on the basis of the information in the service type  163 , whether or not to receive a service identified by the service type  163 . Note that an example of forwarding discovery information will be illustrated in a second embodiment of the present technology. 
     The content ID  164  is an ID for identifying a service. A wireless communication apparatus that transmits or receives the discovery information manages the receiving of a service identified by the content ID  164  on the basis of the information of the content ID  164 , and generates fee information as required. 
     The content attribute  165  is information that indicates the bit capacity required to provide the service, a group able to receive the service, an authentication method required to receive the service, and the like. Herein, the group able to receive the service may be, for example, friends (that is, the wireless communication apparatuses possessed by the friends) of the user who possesses the wireless communication apparatus that provides the service. In this case, an authentication method for identifying a friend may be used to judge whether or not a wireless communication apparatus belongs in the group. In addition, a group able to receive the service may also be taken to be the members of a designated service, for example. In this case, an authentication method that proves membership may be used to judge whether or not a wireless communication apparatus belongs in the group. In addition, a wireless communication apparatus that receives discovery information may also decide, on the basis of the information in the content attribute  165 , whether or not to receive the corresponding service, or whether or not the corresponding service is receivable. In this way, the content attribute  165  is information indicating which wireless communication apparatuses may access the corresponding content, and in addition, how the corresponding content may be accessed. 
     The ranking information  166  is information that indicates the assessment of the service (content) (for example, whether the frequency of access to the service (content) is high or low). A wireless communication apparatus that transmits discovery information may decide, on the basis of the information in the ranking information  166 , whether or not to announce the discovery information to the next wireless communication apparatus, or how frequently to announce the discovery information. A wireless communication apparatus that receives the discovery information may decide, on the basis of the information in the ranking information  166 , whether or not to cache the received content. For example, it is preferable to configure the ranking information  166  so that high-ranking services are announced and received. 
     The cache recommendation  167  is information that indicates a recommendation of how much the service should be cached for neighboring wireless communication apparatuses (a recommended degree). A wireless communication apparatus that transmits discovery information configures a setting that raises the recommended degree in the case of judging that the service is accessed frequently and the service should be provided to other wireless communication apparatuses. Also, a wireless communication apparatus that receives the discovery information may decide, on the basis of the information in the cache recommendation  167 , whether or not to receive and cache content. 
     The clone degree  168  is information that indicates how many times a service (content) has been copied from the original, or alternatively, how many more times copying is allowed. A wireless communication apparatus that receives the discovery information is controlled to be unable to store a copy equal to or greater than a count determined by the clone degree  168 . 
     The redistribution information  169  is information that indicates whether or not a wireless communication apparatus that receives the discovery information may cache and redistribute a service (content). In a wireless communication apparatus that receives the discovery information, the need to cache and redistribute a service (content) is controlled on the basis of the information in the redistribution information  169 . 
     For example, if the first wireless communication apparatus  200  illustrated in  FIG. 1  broadcasts a beacon, the beacon is received by the surrounding wireless communication apparatuses (the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104 ). Subsequently, the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104  are able to detect, on the basis of the header of the received beacon, that the beacon is a beacon transmitted from the first wireless communication apparatus  200 . Also, by checking the details of the beacon information  153  included in the received beacon, the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104  are able to ascertain a service that the first wireless communication apparatus  200  is able to provide and the like. 
     For example, suppose a case in which the beacon  150  transmitted from the first wireless communication apparatus  200  is received by the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104 . In this case, the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104  are able to detect, on the basis of the network attribute  156  included in the received beacon, that the source first wireless communication apparatus  200  exists as part of a network nearby. In addition, attributes of the network are identified by the network attribute  156 . 
     In addition, the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104  are able to acquire, on the basis of the service announcement fields  162  included in the received beacon  150 , information related to various services receivable via the first wireless communication apparatus  200 . 
     In addition, the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104  are able to acquire, on the basis of the user ID fields  172  included in the received beacon  150 , user information related to a user who uses the first wireless communication apparatus  200 . Additionally, the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104  are able to determine, on the basis of the acquired user information, whether or not to exchange services with the first wireless communication apparatus  200  using wireless communication. 
     [Example Display Screen for Registering User Information Using Received Discovery Information] 
       FIG. 9  is a diagram illustrating an example of a display screen (registration screen  350 ) displayed on a display unit  280  according to the first embodiment of the present technology. 
     The registration screen  350  is a display screen for registering user information using discovery information received by the first wireless communication apparatus  200 . In addition, the registration screen  350  is displayed on the basis of discovery information (the service information  157  and the user information  158  illustrated in  FIGS. 7A and 7B ) that is transmitted from each wireless communication apparatus constituting the communication system  100 . 
     On the registration screen  350 , a registration selection  351 , a service  352 , a user ID  353 , and related information  354  are displayed for each service (each source wireless communication apparatus). Also displayed on the registration screen  350  are an arrow button  355 , an OK button  356 , and a Back button  357 . 
     The registration selection  351  is an area for selecting whether or not to register the user information of the user who uses the wireless communication apparatus that transmitted the discovery information. In the registration selection  351 , radio buttons are displayed, for example, and either “Register” or “Do not register” is selected. 
     In the service  352 , the service (a service that the first wireless communication apparatus  200  is able to receive) identified by the service information  157  (illustrated in  FIGS. 7A and 7B ) included in the received discovery information is displayed. The service is displayed on the basis of the discovery information (the service type  163  illustrated in  FIGS. 7A and 7B ), for example. 
     In the user ID  353 , the content of the user ID  174  (illustrated in  FIGS. 7A and 7B ) included in the user information  158  (illustrated in  FIGS. 7A and 7B ) included in the received discovery information is displayed. Note that when multiple user ID fields are included in the user information  158  included in the received discovery information, each user ID is displayed. 
     In the related information  354 , the content of the related information  175  (illustrated in  FIGS. 7A and 7B ) included in the user information  158  (illustrated in  FIGS. 7A and 7B ) included in the received discovery information is displayed. For example, if the related information  175  stores an image enabling one to grasp the user corresponding to the user ID (for example, a penguin, dog, or likeness), that image is displayed. 
     The arrow button  355  is a button pressed to display information related to other discovery information in the case of a large amount of received discovery information. When the arrow button  355  is pressed, information related to other discovery information is successively displayed in response to the pressing operation. 
     The OK button  356  is a button pressed when confirming whether or not to register entries selected by a user operation. 
     The Back button  357  is a button pressed when going back to the previously displayed display screen. 
     [Communication Example] 
       FIG. 10  is a sequence flowchart illustrating an exemplary communication process among apparatuses constituting a communication system  100  according to the first embodiment of the present technology. Note that  FIG. 10  illustrates an example communication process for a case in which the first wireless communication apparatus  200 , the second wireless communication apparatus  102 , and the fourth wireless communication apparatus  104  exist in the topology illustrated in  FIG. 1 . In addition, suppose that the user ID of the user who uses the first wireless communication apparatus  200  is stored in a friend list management table (corresponding to the friend list management table  320  illustrated in  FIG. 4 ) provided in the second wireless communication apparatus  102 . On the other hand, suppose that the user ID of the user who uses the first wireless communication apparatus  200  is not stored in either a friend list management table or a blocked list management table (corresponding to the blocked list management table  330  illustrated in  FIG. 5 ) provided in the fourth wireless communication apparatus  104 . 
     The first wireless communication apparatus  200  announces discovery information (including user information) to each wireless communication apparatus present nearby ( 401  to  404 ). For example, the first wireless communication apparatus  200  transmits a beacon including discovery information to the second wireless communication apparatus  102  and the fourth wireless communication apparatus  104  present nearby ( 401  to  404 ). 
     Note that in  FIG. 10 , a numeral representing the wireless communication apparatus that provides the service identified by the discovery information is indicated in parentheses following the term “discovery information”. In other words, discovery information (1) indicates discovery information related to a service provided by the first wireless communication apparatus  200 . Also, discovery information (2) indicates discovery information related to a service provided by the second wireless communication apparatus  102 . 
     In addition, the discovery information (1) related to a service provided by the first wireless communication apparatus  200  is transmitted as the service information  157  and the user information  158  (illustrated in  FIGS. 7A and 7B ) ( 401  to  404 ). Note that the processing from  401  to  404  is one example of a communication step described in the claims. In addition, the processing in  401  and  403  is an example of a control step. 
     The second wireless communication apparatus  102  and the fourth wireless communication apparatus  104 , by receiving the discovery information (1) from the first wireless communication apparatus  200 , are able to detect what kind of service the source (first wireless communication apparatus  200 ) provides. 
     Also, the second wireless communication apparatus  102  and the fourth wireless communication apparatus  104  conduct a determination process on the basis of the user information included in the discovery information (1) from the first wireless communication apparatus  200  ( 405 ,  406 ). 
     Specifically, the second wireless communication apparatus  102  judges whether or not a match with the user ID included in the discovery information (1) from the first wireless communication apparatus  200  exists in the friend list management table (corresponding to the user ID  322  illustrated in  FIG. 4 ) ( 405 ). As discussed earlier, the user ID of the user who uses the first wireless communication apparatus  200  is stored in a friend list management table provided in the second wireless communication apparatus  102 . For this reason, the second wireless communication apparatus  102  judges that a match with the user ID included in the discovery information (1) from the first wireless communication apparatus  200  exists in the friend list management table ( 405 ). 
     In this way, if a matching user ID exists in the friend list management table ( 405 ), the second wireless communication apparatus  102  transmits a service execution request to the first wireless communication apparatus  200  ( 408 ,  409 ). 
     After receiving the service execution request ( 409 ), the first wireless communication apparatus  200  reads out content (including supplementary information) from the memory  300  according to the service execution request. Subsequently, the first wireless communication apparatus  200  transmits the read-out content (including supplementary information) to the second wireless communication apparatus  102  ( 413 ,  414 ). In other words, the first wireless communication apparatus  200  launches a procedure for establishing a communication link with the second wireless communication apparatus  102 , transitions to a state enabling service provision, and exchanges data with the second wireless communication apparatus  102  ( 413 ,  414 ). Consequently, the second wireless communication apparatus  102  is able to receive the desired service ( 413 ,  414 ). 
     In this way, by mutually communicating discovery information, it is possible to discover adjacent wireless communication apparatuses and receivable services, and conduct peer-to-peer (P2P) communication. 
     Similarly, the fourth wireless communication apparatus  104  judges whether or not a match with the user ID included in the discovery information (1) from the first wireless communication apparatus  200  exists in the friend list management table (corresponding to the friend list management table  320  illustrated in  FIG. 4 ) ( 406 ). As discussed earlier, the user ID of the user who uses the first wireless communication apparatus  200  is not stored in a friend list management table provided in the fourth wireless communication apparatus  104 . For this reason, the fourth wireless communication apparatus  104  judges that a match with the user ID included in the discovery information (1) from the first wireless communication apparatus  200  does not exist in the friend list management table ( 406 ). 
     In this way, when a matching user ID does not exist in the friend list management table, the second wireless communication apparatus  102  conducts a determination process using a blocked list management table (corresponding to the blocked list management table  330  illustrated in  FIG. 5 ) ( 406 ). In other words, the second wireless communication apparatus  102  judges whether or not a match with the user ID included in the discovery information (1) from the first wireless communication apparatus  200  exists in the blocked list management table ( 406 ). 
     As discussed earlier, the user ID of the user who uses the first wireless communication apparatus  200  is not stored in a blocked list management table provided in the fourth wireless communication apparatus  104 . For this reason, the fourth wireless communication apparatus  104  judges that a match with the user ID included in the discovery information (1) from the first wireless communication apparatus  200  does not exist in the blocked list management table ( 406 ). 
     In this way, when a matching user ID does not exist in either the friend list management table or the blocked list management table ( 406 ), the fourth wireless communication apparatus  104  conducts a registration process ( 407 ). 
     Specifically, the fourth wireless communication apparatus  104  causes a registration screen to be displayed (for example, the registration screen  350  illustrated in  FIG. 9 ). Subsequently, on the basis of user operations using the registration screen, the fourth wireless communication apparatus  104  conducts a registration process of registering the user ID included in the discovery information (1) in either the friend list management table or the blocked list management table ( 407 ). For example, when a user operation for registering an entry in the friend list management table is conducted, the user ID included in the discovery information (1) is stored in the friend list management table (corresponding to the user ID  322  illustrated in  FIG. 4 ). On the other hand, when a user operation for registering an entry in the blocked list management table is conducted, the user ID included in the discovery information (1) is stored in the blocked list management table (corresponding to the user ID  332  illustrated in  FIG. 5 ). Note that a user operation that does not register an entry in either the friend list management table or the blocked list management table may also be conducted. As another example, when multiple friend list management tables (for example, multiple friend list management tables according to the closeness of a friend) are provided, the registration process is conducted by conducting a user operation corresponding to each. In addition, when the user ID included in the discovery information (1) is registered in the friend list management table according to a user operation, the fourth wireless communication apparatus  104  may transmit a service execution request to the first wireless communication apparatus  200 . The transmission of the service execution request and thereafter in this case is similar to the processing in  408 ,  409 ,  413 , and  414 . 
     In this way, the control unit  240  associates service information for identifying a service provided by the first wireless communication apparatus  200  with user information for identifying a user who uses the first wireless communication apparatus  200 , and includes and transmits the associated information in discovery information. In addition, the control unit  240  judges, on the basis of user information included in discovery information, whether or not to receive a service according to service information associated with the user information from the other wireless communication apparatus that transmitted the discovery information. 
     For example, the control unit  240  is able to judge whether or not to receive a service, on the basis of whether or not user information registered in the friend list management table  320  matches user information included in received discovery information. As another example, the control unit  240  is able to judge whether or not to receive a service, on the basis of whether or not user information registered in the blocked list management table  330  matches user information included in received data. 
     Note that  FIG. 10  illustrates an example of registering an entry in a friend list management table or a blocked list management table on the basis of a user operation. However, when a matching user ID does not exist in either the friend list management table or the blocked list management table ( 406 ), the fourth wireless communication apparatus  104  may also automatically register the user ID in the blocked list management table ( 407 ). In this case, it is preferable to inform the user before the registration process that the user ID will be registered in the blocked list management table. 
     [Communication Example] 
       FIG. 10  illustrates an example of starting the provision of a service on the basis of only a match determination at the wireless communication apparatus on the receiving side. However, the provision of a service may also be started on the basis of a match determination at the wireless communication apparatuses on both the transmitting side and the receiving side. In other words, the provision of a service may be started on the condition that the user ID of the user using the wireless communication apparatus acting as communication peer is registered in a friend list management table on both the transmitting side and the receiving side.  FIG. 11  illustrates such a communication example. 
       FIG. 11  is a sequence flowchart illustrating an exemplary communication process among apparatuses constituting a communication system  100  according to the first embodiment of the present technology. Note that since the exemplary communication process illustrated in  FIG. 11  is partial modification of the communication process illustrated in  FIG. 10 , the parts shared in common with the communication process illustrated in  FIG. 10  are denoted with the same signs, and some of the description thereof will be reduced or omitted. In addition, suppose that the user ID of the user who uses the second wireless communication apparatus  102  is stored in the friend list management table  320  (illustrated in  FIG. 4 ) provided in the first wireless communication apparatus  200 . 
     If a matching user ID exists in the friend list management table ( 405 ), the second wireless communication apparatus  102 , in order to report its own presence, transmits discovery information (including user information) to the first wireless communication apparatus  200  ( 421 ,  422 ). Note that the second wireless communication apparatus  102  may also transmit discovery information to the first wireless communication apparatus  200  by announcing discovery information to each wireless communication apparatus present nearby (for example, by transmitting a beacon) ( 421 ,  422 ). 
     In addition, if a matching user ID exists in the friend list management table ( 405 ), the second wireless communication apparatus  102  transmits a service execution request in order to establish a relationship of exchanging services with the first wireless communication apparatus  200  ( 408 ,  409 ). 
     The first wireless communication apparatus  200 , by receiving the discovery information (2) from the second wireless communication apparatus  102 , is able to detect what kind of service the source (second wireless communication apparatus  102 ) provides. 
     Also, the first wireless communication apparatus  200  conducts a determination process using the user ID included in the discovery information (2) from the second wireless communication apparatus  102  ( 423 ). Note that this determination process ( 423 ) is similar to the determination process ( 405 ) discussed earlier. 
     As discussed earlier, the user ID of the user who uses the second wireless communication apparatus  102  is stored in the friend list management table  320  provided in the first wireless communication apparatus  200 . For this reason, the first wireless communication apparatus  200  judges that a match with the user ID included in the discovery information (2) from the second wireless communication apparatus  102  exists in the friend list management table  320  ( 423 ). 
     Additionally, if a matching user ID exists in the friend list management table  320  ( 423 ), the first wireless communication apparatus  200  transmits a service execution request in order to establish a relationship of exchanging services with the second wireless communication apparatus  102  ( 424 ,  425 ). 
     In this way, a service execution request is transmitted from each of the first wireless communication apparatus  200  and the second wireless communication apparatus  102  to the peer apparatus ( 408 ,  409 ,  424 ,  425 ). Consequently, service execution between the first wireless communication apparatus  200  and the second wireless communication apparatus  102  is granted, the apparatuses both transition to a state enabling service provision with each other, and data is exchanged between the first wireless communication apparatus  200  and the second wireless communication apparatus  102  ( 426 ,  427 ). Consequently, the second wireless communication apparatus  102  is able to receive the desired service ( 426 ,  427 ). 
     In other words, user information is checked between two wireless communication apparatuses acting as communication peers, and the provision of a desired service may be started only in the case of judging that the users who use the respective wireless communication apparatuses belong to the same group. 
     [Example Operation of Wireless Communication Apparatus] 
       FIG. 12  is a flowchart illustrating an example of a processing sequence of a user information registration process by a first wireless communication apparatus  200  according to the first embodiment of the present technology.  FIG. 12  illustrates an example in which some kind of ID is input into the first wireless communication apparatus  200 , and that ID (user ID) is registered as user information. Also,  FIG. 12  illustrates an example of registering one user ID for one user. 
     First, the control unit  240  judges whether or not an input operation (including input by autocomplete or the like) of some kind of ID (for example, an email address, or an ID used for web access) has been conducted (step S 901 ). For example, suppose that in the first wireless communication apparatus  200 , a program for registering user information continually runs in the background and monitors whether an input operation of some kind of ID has been conducted. Subsequently, when an input operation of some kind of ID is not conducted (step S 901 ), the monitoring continues. 
     Meanwhile, when an input operation of some kind of ID is conducted (step S 901 ), the control unit  240  judges whether or not the user is registered in the user information management table  310  (illustrated in  FIG. 3 ) (step S 902 ). Subsequently, if the user is not registered in the user information management table  310  (step S 902 ), N (the management information  311  illustrated in  FIG. 3 ) is initialized to “0” (step S 903 ). 
     Next, the control unit  240  causes the display unit  280  to display confirmation information for registering the ID input by an input operation as user information (step S 906 ). At this point, if the ID input by an input operation is registered as user information, the ID may be included in discovery information and transmitted, and the ID may be displayed on another wireless communication apparatus. For this reason, a confirmation screen is displayed to enable the user to authorize whether or not the ID input by an input operation may be used as user information to include in discovery information (whether or not the ID may be disclosed to other users), and user authorization is obtained. Also, an operating button for performing an authorization operation (for example, a button that authorizes, and a button that does not authorize) may be displayed together with the confirmation information, for example. 
     Next, the control unit  240  judges whether or not the user conducted an authorization operation after the confirmation information was displayed on the display unit  280  (step S 907 ). Subsequently, if the user did not conduct an authorization operation (in other words, if an operation indicating non-authorization is conducted) (step S 907 ), the ID input by an input operation is not registered as user information, and thus the process returns to step S 901 . On the other hand, if the user conducted an authorization operation (step S 907 ), the control unit  240  conducts a registration process for registering the ID input by an input operation as user information (step S 908 ). For example, the ID input by an input operation is stored in the user ID  314  corresponding to the management information  311  “N” of the user information management table  310  illustrated in  FIG. 3 . Also, the class of the ID input by an input operation is stored in the ID class  313 . Also, other information is stored as necessary, by user operations or automatically. 
     Meanwhile, if the user is not registered in the user information management table  310  (step S 902 ), the control unit  240  judges whether or not a setting allowing the registration of multiple users is configured (step S 904 ). This setting is configured by a user operation in advance. Subsequently, if a setting allowing the registration of multiple users is not configured (in other words, if a setting that only registers one user is configured) (step S 904 ), the ID input by an input operation is not registered as user information, and thus the process returns to step S 901 . On the other hand, if a setting allowing the registration of multiple users is configured (step S 904 ), N (the management information  311  illustrated in  FIG. 3 ) is incremented by “1” (step S 905 ), and the process proceeds to step S 906 . 
     Note that, as illustrated in  FIG. 3 , it is also possible to register multiple user IDs for one user. In this case, a user operation may be performed to select the user under which to register the user information from among the already registered users, and the user information may be registered under the user selected by the user operation. As another example, by monitoring an ID input by a user (for example, monitoring a login ID or the like), it is possible to judge which user from among the already registered users. 
     [Example Operation of Wireless Communication Apparatus] 
       FIG. 13  is a flowchart illustrating an example of a processing sequence of a data communication process by a first wireless communication apparatus  200  according to the first embodiment of the present technology.  FIG. 13  illustrates an example of a data communication process when the first wireless communication apparatus  200  receives discovery information (included in a beacon, for example). 
     First, the control unit  240  judges whether or not user information (the user information  158  illustrated in  FIGS. 7A and 7B ) is included in the discovery information (step S 911 ). Subsequently, if user information is not included in the discovery information (step S 911 ), the operation of the data communication process ends. 
     On the other hand, if user information is included in the discovery information (step S 911 ), the control unit  240  judges whether or not a match with the user ID included in the user information exists in the friend list management table  320  (illustrated in  FIG. 4 ) (step S 912 ). In other words, it is judged whether or not a connection should be made with the wireless communication apparatus that transmitted the discovery information. Specifically, the user ID included in the user information (the user ID  174  illustrated in  FIG. 7B ) is successively compared to each user ID stored in the user ID  322  of the friend list management table  320 . Subsequently, it is judged whether or not a matching user ID exists in the friend list management table  320 . 
     If a matching user ID exists in the friend list management table  320  (step S 912 ), the control unit  240  updates the friend list management table  320  (step S 913 ). Specifically, the control unit  240  performs an update by logging the communication time in the communication history information  323  of the friend list management table  320  (step S 913 ). 
     Next, the control unit  240  conducts a connection process for using wireless communication to connect to the wireless communication apparatus that transmitted the discovery information (step S 914 ). Note that it is possible to judge whether or not to receive a service from the wireless communication apparatus connected by the connection process, on the basis of service information included in the discovery information (the service information  157  illustrated in  FIGS. 7A and 7B ). In addition, the user information and the service information included in the discovery information may also be used to judge whether or not a connection should be made with the wireless communication apparatus that transmitted the discovery information. 
     Meanwhile, if a matching user ID does not exist in the friend list management table  320  (step S 912 ), a match determination using the blocked list management table  330  (illustrated in  FIG. 5 ) is conducted (step S 915 ). In other words, the control unit  240  judges whether or not a match with the user ID included in the user information exists in the blocked list management table  330  (illustrated in  FIG. 5 ) (step S 915 ). Specifically, the user ID included in the user information (the user ID  174  illustrated in  FIG. 7B ) is successively compared to each user ID stored in the user ID  332  of the blocked list management table  330 . Subsequently, it is judged whether or not a matching user ID exists in the blocked list management table  330 . 
     If a matching user ID exists in the blocked list management table  330  (step S 915 ), the operation of the data communication process ends. In other words, a connection process is not conducted with the wireless communication apparatus that transmitted the discovery information. 
     Meanwhile, if a matching user ID does not exist in the blocked list management table  330  (step S 915 ), the control unit  240  causes the display unit  280  to display a registration screen for registering the user information included in the discovery information (step S 916 ). For example, the registration screen  350  illustrated in  FIG. 9  is displayed. 
     Next, the control unit  240  judges whether or not a registration operation for registering the user information included in the discovery information has been conducted (step S 917 ). For example, if an operation of selecting the “Register” option of the registration selection  351  illustrated in  FIG. 9  is conducted, and an operation of pressing the OK button  356  is conducted, it is judged that a registration operation was conducted. On the other hand, if an operation of selecting the “Do not register” option of the registration selection  351  illustrated in  FIG. 9  is conducted, and an operation of pressing the OK button  356  is conducted, it is judged that a registration operation was not conducted. 
     Subsequently, is a registration operation is conducted (step S 917 ), the control unit  240  conducts a registration process of registering the user information included in the discovery information in the friend list management table  320  (step S 918 ). For example, the user ID included in the user information (the user ID  174  illustrated in  FIG. 7B ) is stored in the user ID  322  illustrated in  FIG. 4 . In this case, the same ID class  321  (illustrated in  FIG. 4 ) as the ID class included in the user information (the ID class  173  illustrated in  FIGS. 7A and 7B ) is stored in association. Also, the communication time is logged in the communication history information  323  illustrated in  FIG. 4 . Next, the control unit  240  conducts a connection process for using wireless communication to connect to the wireless communication apparatus that transmitted the discovery information (step S 914 ). 
     Meanwhile, if a registration operation is not conducted (step S 917 ), the control unit  240  conducts a registration process of registering the user information included in the discovery information in the blocked list management table  330  (step S 919 ). For example, the user ID included in the user information (the user ID  174  illustrated in  FIG. 7B ) is stored in the user ID  332  illustrated in  FIG. 5 . In this case, the same ID class  331  (illustrated in  FIG. 5 ) as the ID class included in the user information (the ID class  173  illustrated in  FIGS. 7A and 7B ) is stored in association. 
     Note that  FIG. 13  illustrates an example of registering user information for which a matching user ID does not exist in either the friend list management table  320  or the blocked list management table  330  in either table on the basis of a user operation. However, the inability to conduct such a user operation every time discovery information is received is also anticipated. For this reason, regarding user information for which a matching user ID does not exist, it may be configured so that such user information is not registered in either of the friend list management table  320  and the blocked list management table  330 . 
     Also, although  FIG. 13  illustrates an example of judging whether or not to register user information included in discovery information every time the discovery information is received, a registration operation may also be conducted all at once on multiple sets of user information. 
     [Example of Conducting Match Determination Using External Apparatus] 
     The foregoing illustrates an example of conducting a match determination using a friend list management table provided in each wireless communication apparatus. However, a match determination may also be conducted using an external apparatus. For example, a wireless communication apparatus may use wireless communication to connect to an external apparatus, the external apparatus may conduct a match determination using information provided in the external apparatus (for example, information corresponding to a friend list management table), and the wireless communication apparatus may receive and use the determination result. Accordingly,  FIG. 14  illustrates an example of conducting a match determination using an external apparatus. 
     [Exemplary Configuration of Communication System] 
       FIG. 14  is a diagram that illustrates an exemplary system configuration of a communication system  400  according to a modification of the first embodiment of the present technology. 
     The communication system  400  is equipped with a friend list management server  410 , a public network  420 , a communication control apparatus  430 , a base station  431 , a plurality of wireless communication apparatuses (first wireless communication apparatus  200 , second wireless communication apparatus  102 , third wireless communication apparatus  103 , and 4th wireless communication apparatus  104 ). 
     The public network  420  is a public network such as a telephone network or the Internet. In addition, the public network  420  and the communication control apparatus  430  are connected via a gateway (not illustrated). 
     The communication control apparatus  430  is a communication control apparatus managed by a telecommunications carrier that provides wireless communication services, and conducts authentication control of wireless communication apparatuses connected via the base station  431 . Additionally, the communication control apparatus  430  connects an authenticated wireless communication apparatus to the public network  420  via a gateway (not illustrated). 
     In addition, the communication control apparatus  430  outputs various information transmitted from each wireless communication apparatus via the base station  431  to the friend list management server  410 . In addition, the communication control apparatus  430  transmits various information output from the friend list management server  410  to each wireless communication apparatus via the base station  431 . 
     The base station  431  is a base station operated by the telecommunications carrier. In other words, the base station  431  is mobile communication base station (NodeB or eNodeB) that connects, via a wireless link, a wireless communication apparatus holding contracted authentication information according to the telecommunications carrier to the communication control apparatus  430  operated by the telecommunications carrier. 
     The friend list management server  410  is equipped with a friend list management database  411  and a determination unit  412 . 
     The friend list management database  411  is a database for managing, for each wireless communication apparatus, information related to a user who uses each wireless communication apparatus (user information). Note that the managed content of the friend list management database  411  will be described in detail with reference to  FIG. 15 . 
     The determination unit  412  conducts a determination process using the friend list management database  411  in response to a query from a wireless communication apparatus, and transmits the determination result to the wireless communication apparatus that transmitted the query. Note that the determination process by the determination unit  412  is similar to the determination process discussed earlier. 
     In addition, each wireless communication apparatus (first wireless communication apparatus  200 , second wireless communication apparatus  102 , third wireless communication apparatus  103 , and fourth wireless communication apparatus  104 ) is approximately similar to  FIG. 1 . For this reason, the parts shared in common with the wireless communication apparatus illustrated in  FIGS. 1 and 2  are denoted with the same signs, and some of the description thereof will be reduced or omitted. 
     However, suppose that the communication unit  220  of the first wireless communication apparatus  200  (illustrated in  FIG. 2 ) is equipped with a communication function for communicating with an access point or the like of a mobile phone network or a public wireless LAN. For example, the communication unit  220  of the first wireless communication apparatus  200  is equipped with a communication function such as 3rd Generation (3G), Long Term Evolution (LTE), or Wireless Fidelity (WiFi, registered trademark). In this case, the first wireless communication apparatus  200  is able to access the Internet via the mobile phone network or the public wireless LAN. In addition, the first wireless communication apparatus  200  is able to access the friend list management server  410  via the base station  431 , for example. 
     [Example Content of Friend List Management Database] 
       FIG. 15  is a diagram that schematically illustrates an example of managed content in a friend list management database  411  stored in memory  300  according to a modification of the first embodiment of the present technology. 
     The friend list management database  411  is a database for managing peers (for example, friends and acquaintances of the user) permitted to use a wireless communication apparatus to receive various services. 
     Specifically, in the friend list management database  411 , a terminal ID  415 , an ID class  416 , and a user ID  417  are sorted by each wireless communication apparatus and stored in association with each other. 
     The terminal ID  415  is terminal identification information (for example, a device-specific ID) for identifying a wireless communication apparatus. The terminal ID  415  stores an International Mobile Equipment Identity (IMEI), for example. Note that although an IMEI is expressed as a 15-digit number, for the sake of simplicity,  FIG. 15  illustrates only a comparatively simple number for the terminal ID  415 . Also, as an example, suppose that the terminal ID  415  “1234” corresponds to the first wireless communication apparatus  200 . 
     Note that the ID class  416  and the user ID  417  correspond to the ID class  321  and the user ID  322  illustrated in  FIG. 4 . 
     [Example Operation of Wireless Communication Apparatus] 
       FIG. 16  is a flowchart illustrating an example of a processing sequence of a data communication process by a first wireless communication apparatus  200  according to a modification of the first embodiment of the present technology. Note that this processing sequence is a partial modification of the processing sequence illustrated in  FIG. 13 . For this reason, the parts shared in common with the processing sequence illustrated in  FIG. 13  are denoted with the same signs, and some of the description thereof will be reduced or omitted. 
     If a matching user ID does not exist in the blocked list management table  330  (step S 915 ), the control unit  240  judges whether or not a setting allowing external querying is configured (step S 920 ). This setting is configured by a user operation in advance. As another example, the control unit  240  may judge whether or not external querying is available, and if external querying is available, confirm with the user whether or not to conduct external querying. In addition, if a setting allowing external querying is not configured (in other words, if a setting prohibiting external querying is configured) (step S 920 ), the process proceeds to step S 916 . 
     Meanwhile, if a setting allowing external querying is configured (step S 920 ), the control unit  240  conducts an external querying process (step S 921 ). Specifically, the control unit  240  accesses the friend list management server  410  via the base station  431 , and transmits user information included in discovery information to the determination unit  412  of the friend list management server  410  (step S 921 ). 
     Upon receiving the user information, the determination unit  412  judges whether or not a match with the user ID included in the user information exists in the friend list management database  411  (illustrated in  FIG. 14 ). Subsequently, if a matching user ID exists in the friend list management database  411 , the determination unit  412  transmits a determination result indicating that a matching user ID exists (match information) to the first wireless communication apparatus  200  via the base station  431 . On the other hand, if a matching user ID does not exist in the friend list management database  411 , the determination unit  412  transmits a determination result indicating that a matching user ID does not exist (non-match information) to the first wireless communication apparatus  200  via the base station  431 . 
     Next, the control unit  240  judges whether or not match information was received after the external querying process (step S 922 ). Subsequently, if match information was not received (in other words, if non-match information was received) (step S 922 ), the process proceeds to step S 916 . On the other hand, if match information was received (step S 922 ), the process proceeds to step S 918 . 
     Note that although  FIG. 16  illustrates an example of automatically registering user information included in discovery information in the friend list management table  320  if match information is received after an external querying process, the registration may also be conducted after a confirmation operation by the user. In addition, when non-match information is received after an external querying process, user information included in discovery information may be registered automatically or manually in the blocked list management table  330 . Consequently, when the same user information is received, conducting another external query is not necessary. 
     In addition,  FIG. 16  illustrates an example in which the friend list management server  410  conducts a determination process using the friend list management database  411  when a matching user ID does not exist in either the friend list management table  320  or the blocked list management table  330 . However, user information stored in the friend list management database  411  may also be supplied to the first wireless communication apparatus  200 , and the first wireless communication apparatus  200  may use the supplied user information to conduct a determination process. Note that user information supplied to the first wireless communication apparatus  200  may be taken to be only information that does not pose a security problem (for example, information that has been authorized in advance by the user). 
     Note that recently, technology that registers a friend list using a social network service (SNS) has proliferated widely. For this reason, an SNS may also be used to conduct a match determination. 
     2. Second Embodiment 
     The first embodiment of the present technology illustrates an example in which only user information provided in the wireless communication apparatus (local apparatus) that is the transmission source of discovery information is included in the discovery information and transmitted. At this point, as discussed earlier, it is possible to include and transmit service information provided by a wireless communication apparatus (other apparatus) other than the wireless communication apparatus (local apparatus) that is the transmission source of discovery information in the discovery information. For this reason, as an example, it is conceivable to include and transmit user information provided in a wireless communication apparatus (other apparatus) other than the wireless communication apparatus (local apparatus) that is the transmission source of discovery information in the discovery information. 
     Accordingly, a second embodiment of the present technology illustrates an example in which user information provided in a wireless communication apparatus (other apparatus) other than the wireless communication apparatus (local apparatus) that is the transmission source of discovery information is included in the discovery information and transmitted. Note that the communication system according to the second embodiment of the present technology is approximately similar to the communication system  100  illustrated in  FIG. 1 . For this reason, the parts shared in common with the communication system  100  are denoted with the same signs, and some of the description thereof will be reduced or omitted. 
     [Example Format of Discovery Information] 
       FIGS. 17 and 18  are diagrams illustrating an example format of a beacon transmitted by each wireless communication apparatus constituting a communication system  100  according to the second embodiment of the present technology. Note that  FIG. 17  illustrates an example format of other apparatus service information  502  included in a beacon  600 , while  FIG. 18  illustrates an example format of other apparatus user information  504  included in a beacon  600 . Also, the beacon  600  is a partial modification of the beacon  150  illustrated in  FIGS. 7A and 7B . For this reason, the parts shared in common with the beacon  150  are denoted with the same signs, and some of the description thereof will be reduced or omitted. 
     The beacon  600  is the result of treating the service information  157  in the beacon  150  illustrated in  FIGS. 7A and 7B  as local apparatus service information  501 , treating the user information  158  as local apparatus user information  503 , and adding other apparatus service information  502  and other apparatus user information  504 . 
     The other apparatus service information  502  is information related to a service provided by a wireless communication apparatus present near the source wireless communication apparatus (other apparatus service information). Note that the local apparatus service information  501  and the other apparatus service information  502  corresponds to the discovery information. 
     As illustrated in  FIG. 17 , the other apparatus service information  502  is made up of information fields, namely an element ID  511 , a length  512 , wireless communication apparatus IDs [ 0 ] to [P]  513 , and service announcement fields [ 0 ] to [P]  514 . 
     Note that the other apparatus service information  502  stores information that is basically similar to the local apparatus service information  501  (same as the service information  157  illustrated in  FIG. 7A ), but differs by additionally storing the wireless communication apparatus IDs [ 0 ] to [P]  513 . In other words, the element ID  511  and the length  512  correspond to the element ID  160  and the length  161  illustrated in  FIG. 7A . In addition, the wireless communication apparatus IDs [ 0 ] to [P]  513  and the service announcement fields [ 0 ] to [P]  514  are placed in pairs for each service provided by a wireless communication apparatus. 
     The wireless communication apparatus IDs [ 0 ] to [P]  513  are an ID for identifying a corresponding wireless communication apparatus (for example, a nearby wireless communication apparatus). In other words, the wireless communication apparatus IDs [ 0 ] to [P]  513  are information indicating which wireless communication apparatus provides the service of the paired service announcement field. 
     The service announcement fields [ 0 ] to [P]  514  are made up of one or a plurality of (for example, P) service announcement fields. Note that the service announcement fields [ 0 ] to [P]  514  are similar to the service announcement fields [ 0 ] to [N]  162  illustrated in  FIG. 7A , except that information related to another wireless communication apparatus (a wireless communication apparatus other than the wireless communication apparatus that transmits the beacon) is stored. 
     In other words, the combinations of the wireless communication apparatus IDs [ 0 ] to [P]  513  and the service announcement fields [ 0 ] to [P]  514  (that is, P combinations) are equal to the number of services that should be reported to the wireless communication apparatus that transmits the beacon. 
     The other apparatus user information  504  is information related to a user who uses a wireless communication apparatus present near the source wireless communication apparatus (other apparatus user information). Note that the local apparatus user information  503  and the other apparatus user information  504  corresponds to the discovery information. 
     As illustrated in  FIG. 18 , the other apparatus user information  504  is made up of information fields, namely an element ID  521 , a length  522 , wireless communication apparatus IDs [ 0 ] to [Q]  523 , and user ID fields [ 0 ] to [Q]  524 . 
     Note that the other device user information  504  stores information that is basically similar to the local device user information  503  (the same as the user information  158  illustrated in  FIG. 7B ), but differs by additionally storing the wireless communication apparatus IDs [ 0 ] to [Q]  524 . In other words, the element ID  521  and the length  522  correspond to the element ID  170  and the length  171  illustrated in  FIG. 7B . In addition, the wireless communication apparatus IDs [ 0 ] to [Q]  523  and the user ID fields [ 0 ] to [Q]  524  are placed in pairs for each user ID of a user who uses a wireless communication apparatus. 
     The wireless communication apparatus IDs [ 0 ] to [Q]  523  are an ID for identifying a corresponding wireless communication apparatus (for example, a nearby wireless communication apparatus). In other words, the wireless communication apparatus IDs [ 0 ] to [Q]  523  are information indicating which wireless communication apparatus includes the user ID of the paired user ID field. 
     The user ID fields [ 0 ] to [Q]  524  are made up of one or a plurality of (for example, Q) user ID fields. Note that the user ID fields [ 0 ] to [Q]  524  are similar to the user ID fields [ 0 ] to [M]  172  illustrated in  FIG. 7B , except that information related to another wireless communication apparatus (a wireless communication apparatus other than the wireless communication apparatus that transmits the beacon) is stored. 
     In other words, the combinations of the wireless communication apparatus IDs [ 0 ] to [Q]  523  and the user ID fields [ 0 ] to [Q]  524  (that is, Q combinations) are equal to the number of user IDs that should be announced by the wireless communication apparatus that transmits the beacon. 
     At this point, since user information corresponds to personal information, it is also possible to limit the forwarding of user information to other wireless communication apparatuses. For example, limit information for imposing a forwarding limit on user information may be stored in the user ID fields [ 0 ] to [Q]  524 . This limit information may be stored as, for example, information indicating whether the forwarding of user information is allowed or not allowed, and information indicating an available forwarding count (for example, one time) when the forwarding of user information is allowed. Herein, it is anticipated that user information includes information that may be forwarded and information that should be kept private (information for which forwarding is undesirable). For example, among the user information, it is anticipated that some users may allow a nickname to be forwarded and become known to other users, but not want their real name to be forwarded and become known to other users. In addition, it is anticipated that some users may allow their real name to be forwarded and become known to other users, but not want their birthday or address to be forwarded and become known to other users. In this way, since the privacy level differs depending on the user, it is possible to store, as the limit information, information (privacy information) for specifying the content that should be kept private when the forwarding of user information is allowed. Subsequently, among the user information, content specified by the privacy information may not be forwarded, while other information may be forwarded. 
     In addition, a wireless communication apparatus that receives discovery information including the user ID fields [ 0 ] to [Q]  524  storing limit information judges, on the basis of the limit information, whether or not to forward the user information included in the discovery information. Also, if privacy information is stored as the limit information, the user information to be forwarded is limited according to the content. As another example, it is also possible to store limit information indicating that forwarding is allowed on the condition that a match is determined at the destination wireless communication apparatus. In this case, user information is transmitted among friends as discovery information, for example. 
     Here, an example of communication of the discovery information. For example, if the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104  illustrated in  FIG. 1  receive discovery information from the first wireless communication apparatus  200 , each apparatus itself operates as a relay node in a multi-hop relay. Consequently, the second wireless communication apparatus  102  to the fourth wireless communication apparatus  104  are able to inform relay destinations of the services that the first wireless communication apparatus  200  is able to provide. In other words, discovery information transmitted by the second wireless communication apparatus  102  and the fourth wireless communication apparatus  104  may partially include services that are provided from the first wireless communication apparatus  200 . 
     By repeatedly transmitting and receiving discovery information in this way, it becomes possible to provide discovery information about the first wireless communication apparatus  200  to every corner of the network. In other words, by including discovery information in a periodically transmitted beacon, each wireless communication apparatus is able to announce providable services to nearby wireless communication apparatuses. In addition, by receiving beacons, each wireless communication apparatus is able to discover wireless communication apparatuses present nearby, and at the same time also detect which services are being provided by the discovered wireless communication apparatuses. 
     Meanwhile, by limiting the packet forwarding count as discussed above, it is possible to limit the communication peers able that the first wireless communication apparatus  200  may connect to. In this way, by limiting the forwarding count, the range over which to transmit discovery information about the first wireless communication apparatus  200  may be adjusted. Consequently, overhead may be decreased. 
     [Example of Transmitting and Receiving Discovery Information] 
       FIG. 19  is a diagram that schematically illustrates a flow of discovery information transmitted and received in a communication system  100  according to the second embodiment of the present technology.  FIG. 19  schematically illustrates a flow for a case in which discovery information (included in a beacon) is transmitted in order from the seventh wireless communication apparatus  107 , to the second wireless communication apparatus  102 , to the first wireless communication apparatus  200 . Also,  FIG. 19  illustrates an example of transmitting and receiving in the case in which a forwarding limit is not imposed on the user information. 
     The beacon  601  indicates a beacon transmitted by the seventh wireless communication apparatus  107  to the second wireless communication apparatus  102 , while the beacon  602  indicates a beacon transmitted by the second wireless communication apparatus  102  to the first wireless communication apparatus  200 . 
     For example, suppose that “A” is stored in the user ID  314  of the user information management table  310  of the seventh wireless communication apparatus  107 , and “B” is stored in the user ID  314  of the user information management table  310  of the second wireless communication apparatus  102 . In addition, suppose that “A” and “B” are stored in the user ID  322  of the friend list management table  320  of the first wireless communication apparatus  200 . 
     In this case, the first wireless communication apparatus  200  is able to determine a match for both the user ID “A” provided in the seventh wireless communication apparatus  107  and the user ID “B” provided in the second wireless communication apparatus  102 . However, since the first wireless communication apparatus  200  and the seventh wireless communication apparatus  107  do not communicate directly, with the discovery information illustrated in the first embodiment of the present technology, the user ID “A” of the seventh wireless communication apparatus  107  cannot be transmitted to the first wireless communication apparatus  200 . Accordingly, in the second embodiment of the present technology, the user ID “A” provided in the seventh wireless communication apparatus  107  is transmitted to the first wireless communication apparatus  200  via the second wireless communication apparatus  102  as other apparatus user information  504 . Consequently, the first wireless communication apparatus  200  is able to conduct a determination process on the user ID “A” provided in the seventh wireless communication apparatus  107 , and received a service from the seventh wireless communication apparatus  107  via the second wireless communication apparatus  102 . 
     First, the control unit  240  of the seventh wireless communication apparatus  107  generates discovery information (local apparatus user information  503  (user ID: A)) on the basis of the user ID stored in the user information management table  310  of the seventh wireless communication apparatus  107 . Next, the control unit  240  of the seventh wireless communication apparatus  107  includes the generated discovery information (local apparatus user information  503  (user ID: A)) in the beacon  601 , and transmits to the second wireless communication apparatus  102 . In this case, service information related to a service provided by the seventh wireless communication apparatus  107  is transmitted as the local apparatus service information  501 . 
     The control unit  240  of the second wireless communication apparatus  102  receives the beacon  601 , and conducts a determination process on the basis of the discovery information (local apparatus user information  503  (user ID: A)) included in the received beacon  601 . Note that since the determination process is similar to the first embodiment of the present technology, a description herein will be omitted. 
     In addition, the control unit  240  of the second wireless communication apparatus  102  temporarily stores the local apparatus user information  503  (user ID: A) included in the received beacon  601  in the memory  300  of the second wireless communication apparatus  102 . In this case, the local apparatus service information  501  included in the received beacon  601  is also temporarily stored in the memory  300  of the second wireless communication apparatus  102 . 
     In addition, the control unit  240  of the second wireless communication apparatus  102  generates discovery information on the basis of the user ID stored in the user information management table  310  of the second wireless communication apparatus  102 . At this point, in the example illustrated in  FIG. 19 , “B” is stored in the user ID  314  of the user information management table  310 . For this reason, the second wireless communication apparatus  102  includes discovery information related to the user ID “A” temporarily stored in the memory  300  and the user ID “B” stored in the user information management table  310  in the beacon  602 , and transmits to the first wireless communication apparatus  200 . In other words, the user ID “A” provided in the seventh wireless communication apparatus  107  is transmitted as the other apparatus user information  504 , and the user ID “B” provided in the second wireless communication apparatus  102  is transmitted as the local apparatus user information  503 . In addition, service information related to a service provided by the seventh wireless communication apparatus  107  is transmitted as the other apparatus service information  502 , and a service provided by the second wireless communication apparatus  102  is transmitted as the local apparatus service information  501 . 
     The control unit  240  of the first wireless communication apparatus  200  receives the beacon  602 , and conducts a determination process on the basis of the discovery information (local apparatus user information  503  (user ID: A), other apparatus user information  504  (user ID: B)) included in the received beacon  602 . In this case, the control unit  240  of the first wireless communication apparatus  200  conducts a determination process on each of the local apparatus user information  503  (user ID: A) and the other apparatus user information  504  (user ID: B). In other words, a match determination is conducted on each of the user ID “A” provided in the seventh wireless communication apparatus  107  and the user ID “B” provided in the second wireless communication apparatus  102 . 
     As illustrated in  FIG. 19 , “A” and “B” are stored in the user ID  322  of the friend list management table  320  of the first wireless communication apparatus  200 . For this reason, each of the user ID “A” provided in the seventh wireless communication apparatus  107  and the user ID “B” provided in the second wireless communication apparatus  102  are determined to match the user ID  322  of the friend list management table  320 . In this case, the first wireless communication apparatus  200  is able to receive a service from the second wireless communication apparatus  102 , and also receive a service from the seventh wireless communication apparatus  107  via the second wireless communication apparatus  102 . 
     In addition, the control unit  240  of the first wireless communication apparatus  200  temporarily stores the local apparatus user information  503  (user ID: A) and the other apparatus user information  504  (user ID: B) included in the received beacon  602  in the memory  300 . Subsequently, the control unit  240  includes and transmits discovery information related to the user ID stored in the user information management table  310  and the temporarily stored user IDs “A” and “B” (local apparatus user information  503 , other apparatus user information  504 ) in a beacon. Also, respective service information is similarly included in the beacon and transmitted. 
     In this way, the control unit  240  associates service information and user information, and includes and transmits the associated information in discovery information. For example, it is possible to associate and transmit service information for identifying a service provided by at least one of the first wireless communication apparatus  200  and another wireless communication apparatus with user information for identifying a user who uses a wireless communication apparatus that provides the service. In this case, for example, it is possible to associate and transmit user information related to a user who uses the first wireless communication apparatus  200  (first user information) and user information included in discovery information transmitted from another wireless communication apparatus (second user information). At this point, for the second user information, only second user information for which forwarding is allowed may be included in the discovery information and transmitted. 
     In this way, in an embodiment of the present technology, when nearby wireless communication apparatuses communicate with each other, discovery information, including service information and associated user information for identifying a user who uses a wireless communication apparatus that provides the service, is transmitted and received. By exchanging service information in this way, a service provided by the local apparatus or another apparatus may be reported efficiently to a nearby wireless communication apparatus. In addition, since user information is associated with the service information and transmitted, a user who uses a wireless communication apparatus that provides a service may be identified, making it possible to easily and efficiently judge which wireless communication apparatuses are trustworthy. For example, when the user identified by the user information is in one&#39;s own circle (a friend or acquaintance), the wireless communication apparatus used by that user may be judged to be trustworthy. As a result, it is possible to easily and safely exchange services using wireless communication among nearby wireless communication apparatuses. 
     The above-described embodiments are examples for embodying the present technology, and matters in the embodiments each have a corresponding relationship with disclosure-specific matters in the claims. Likewise, the matters in the embodiments and the disclosure-specific matters in the claims denoted by the same names have a corresponding relationship with each other. However, the present technology is not limited to the embodiments, and various modifications of the embodiments may be embodied in the scope of the present technology without departing from the spirit of the present technology. 
     The processing sequences that are described in the embodiments described above may be handled as a method having a series of sequences or may be handled as a program for causing a computer to execute the series of sequences and recording medium storing the program. As the recording medium, a hard disk, a CD (Compact Disc), an MD (MiniDisc), and a DVD (Digital Versatile Disk), a memory card, and a Blu-ray disc (registered trademark) can be used. 
     Additionally, the present technology may also be configured as below. 
     (1) 
     A wireless communication apparatus including: 
     a communication unit configured to use wireless communication to transmit and receive data related to a service provided by at least one of the wireless communication apparatus and another wireless communication apparatus with other wireless communication apparatuses present within a designated range; and 
     a control unit configured to associate service information for identifying the service with user information for identifying a user using a wireless communication apparatus that provides the service, and include and transmit the associated information in the data. 
     (2) 
     The wireless communication apparatus according to (1), wherein 
     when the data is received, the control unit judges, on the basis of the user information included in the data, whether or not to receive a service according to the service information associated with the user information from another wireless communication apparatus according to the user information. 
     (3) 
     The wireless communication apparatus according to (2), wherein 
     the control unit judges whether or not to receive the service, on the basis of whether or not the user information included in the received data matches the user information registered in an allow list. 
     (4) 
     The wireless communication apparatus according to (3), wherein 
     the control unit judges whether or not to receive the service, on the basis of a result of a match determination using the allow list stored in a storage unit or the allow list stored in an external apparatus. 
     (5) 
     The wireless communication apparatus according to any one of (2) to (4), wherein 
     the control unit judges whether or not to receive the service, on the basis of whether or not the user information included in the received data matches the user information registered in a blocked list. 
     (6) 
     The wireless communication apparatus according to any one of (1) to (5), wherein 
     the control unit includes, in the data, and transmits first user information which is the user information according to a user using the wireless communication apparatus, and second user information which is the user information included in the data transmitted from another wireless communication apparatus, and also the user information according to a user using the other wireless communication apparatus. 
     (7) 
     The wireless communication apparatus according to (6), wherein 
     the control unit includes only the second user information for which forwarding is allowed in the data and transmits the data. 
     (8) 
     A wireless communication apparatus including: 
     a communication unit configured to transmit and receive data related to a service provided by at least one of the wireless communication apparatus and another wireless communication apparatus, the data including information associating service information for identifying the service with user information for identifying a user using a wireless communication apparatus that provides the service; and 
     a control unit that, when the data is received, judges, on the basis of the user information included in the data, whether or not to receive a service according to the service information associated with the user information from another wireless communication apparatus according to the user information. 
     (9) 
     A communication system including: 
     a first wireless communication apparatus provided with a communication unit configured to use wireless communication to transmit and receive data related to a service provided by at least one of the wireless communication apparatus and another wireless communication apparatus with other wireless communication apparatuses present within a designated range, and a control unit configured to associate service information for identifying the service with user information for identifying a user using a wireless communication apparatus that provides the service, and include and transmit the associated information in the data; and 
     a second wireless communication apparatus provided with a communication unit that transmits and receives the data, and a control unit that, when the data is received, judges, on the basis of the user information included in the data, whether or not to receive a service according to the service information associated with the user information from another wireless communication apparatus according to the user information. 
     (10) 
     A wireless communication apparatus control method including: 
     a communicating step of using wireless communication to transmit and receive data related to a service provided by at least one of the wireless communication apparatus and another wireless communication apparatus with other wireless communication apparatuses present within a designated range; and 
     a controlling step of associating service information for identifying the service with user information for identifying a user using a wireless communication apparatus that provides the service, and including and transmitting the associated information in the data. 
     (11) 
     A program causing a computer to execute: 
     a communicating step of using wireless communication to transmit and receive data related to a service provided by at least one of the wireless communication apparatus and another wireless communication apparatus with other wireless communication apparatuses present within a designated range; and 
     a controlling step of associating service information for identifying the service with user information for identifying a user using a wireless communication apparatus that provides the service, and including and transmitting the associated information in the data. 
     REFERENCE SIGNS LIST 
     
         
           100  communication system 
           102  second wireless communication apparatus 
           103  third wireless communication apparatus 
           104  fourth wireless communication apparatus 
           105  fifth wireless communication apparatus 
           106  sixth wireless communication apparatus 
           107  seventh wireless communication apparatus 
           108  eighth wireless communication apparatus 
           109  ninth wireless communication apparatus 
           110  10th wireless communication apparatus 
           111  11th wireless communication apparatus 
           112  12th wireless communication apparatus 
           113  13th wireless communication apparatus 
           200  first wireless communication apparatus 
           210  antenna 
           220  communication unit 
           230  I/O interface 
           240  control unit 
           250  bus 
           260  movement detection unit 
           270  operation receiving unit 
           280  display unit 
           290  audio output unit 
           300  memory 
           400  communication system 
           410  friend list management server 
           411  friend list management database 
           412  determination unit 
           420  public network 
           430  communication control apparatus 
           431  base station