JP2012090127A - Network apparatus and network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network apparatus that can facilitate the recognition of a reduction in the communication quality of a network due to the participation in the network of an electronic apparatus having a communication function compatible with an old version of predetermined communication standards.SOLUTION: A set-top box 10 (network apparatus) includes: a communication section 11 connected to an electronic apparatus (video recording apparatus 20) compatible with a new version of MoCA standards via in-home coaxial wiring 2; and a CPU 12 for establishing communication with the electronic apparatus compatible with the new version of MoCA standards via the communication section 11 to configure a network, and when an electronic apparatus (communication adapter 30) compatible with an older version of MoCA standards participates in the configured network, notifying a user of a reduction in the communication quality of the network due to the participation of the electronic apparatus compatible with the older version of MoCA standards.

Description

  The present invention relates to a network device and a network system, and more particularly, to a network device and a network system including a communication unit connected to an electronic device having a communication function corresponding to a predetermined communication standard.

  Conventionally, an information output device (network device) including a communication unit connected to an electronic device having a communication function corresponding to a predetermined communication standard is known (for example, see Patent Document 1). The information output device disclosed in Patent Document 1 communicates with an electronic device having a communication function corresponding to the IEEE 1394 standard (predetermined communication standard) via an IEEE 1394 I / F circuit (communication unit). Configured to build.

JP 2001-86143 A

  However, in the information output device disclosed in Patent Document 1, in a state where a network is constructed with an electronic device having a communication function corresponding to a new version of a communication standard (for example, IEEE 1394b standard), When an electronic device having a communication function corresponding to an old version of a communication standard (for example, IEEE 1394a standard) participates in the network, the communication quality (for example, communication speed) of the network decreases to the level of the old version of the communication standard. End up. Here, in order to recognize whether or not the network communication speed has decreased, it is necessary to measure the network communication speed using a dedicated measuring instrument. For this reason, in the information output apparatus as disclosed in Patent Document 1, whether or not the communication speed of the network has decreased due to the participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard. There is a problem that it is difficult to recognize.

  The present invention has been made to solve the above problems, and one object of the present invention is that an electronic device having a communication function corresponding to an old version of a predetermined communication standard participates in a network. It is an object of the present invention to provide a network device and a network system that can easily recognize that the communication quality of the network has deteriorated.

Means for Solving the Problems and Effects of the Invention

  A network device according to a first aspect of the present invention includes a communication unit connected to an electronic device having a communication function corresponding to a new version of a predetermined communication standard via a coaxial wiring, and a predetermined communication standard via the communication unit. An electronic device having a communication function corresponding to an old version of a predetermined communication standard is established in the constructed network by establishing a network on the coaxial wiring by communicating with an electronic device having a communication function corresponding to the new version of And a control unit that performs control to notify the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard.

  In the network device according to the first aspect of the present invention, as described above, the control unit has a predetermined network in a network constructed by communicating with an electronic device having a communication function corresponding to a new version of a predetermined communication standard. When an electronic device having a communication function corresponding to an old version of a communication standard participates, the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard. It is configured to perform control to notify the user. As a result, by checking the notification content notified from the control unit, the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard in the network. Can be easily recognized.

  In the network device according to the first aspect, preferably, the control unit supports an old version of a predetermined communication standard when an electronic device having a communication function corresponding to the old version of the predetermined communication standard participates in the network. The display is configured to display a screen for notifying the user that the communication quality of the network has deteriorated due to the participation of the electronic device having the communication function. With this configuration, it is easy to visually check that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard by viewing the display unit. Can be recognized.

  In this case, preferably, the network device displays a screen for notifying the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard. Connected to an electronic device having a display unit. With this configuration, even if the network device does not have a display unit, the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard. A screen for notifying the user can be displayed on a display unit of an electronic device connected to the network device. Accordingly, it is possible to reliably visually recognize that the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard.

  In the network device for displaying on the display unit a screen for notifying the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to the old version of the predetermined communication standard. The control unit causes the display unit to display a screen for notifying the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard. A screen for notifying a user of information for specifying an electronic device having a communication function corresponding to an old version of a predetermined communication standard can be displayed on the display unit. According to this configuration, when a screen for notifying the user of information for specifying an electronic device having a communication function corresponding to an old version of a predetermined communication standard is displayed on the display unit, the screen is displayed. By viewing, it is possible to acquire information that identifies the electronic device that is the cause of the deterioration in the communication quality of the network. Moreover, the communication quality of a network can be improved by removing the electronic device specified based on the acquired information from the network.

  In this case, preferably, the information for specifying the electronic device having the communication function corresponding to the old version of the predetermined communication standard is the MAC address of the electronic device having the communication function corresponding to the old version of the predetermined communication standard. is there. If comprised in this way, the electronic device which has a communication function corresponding to the old version of a predetermined | prescribed communication standard can be easily specified based on a MAC address.

  A network system according to a second aspect of the present invention includes a communication unit connected to an electronic device having a communication function corresponding to a new version of a predetermined communication standard via a coaxial wiring, and a predetermined communication standard via the communication unit. An electronic device having a communication function corresponding to an old version of a predetermined communication standard is established in the constructed network by establishing a network on the coaxial wiring by communicating with an electronic device having a communication function corresponding to the new version of A network including a control unit that controls to notify the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard when participating Equipment.

  In the network system according to the second aspect, as described above, the control unit of the network device is predetermined in a network constructed by communicating with an electronic device having a communication function corresponding to a new version of a predetermined communication standard. The communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard when an electronic device having a communication function corresponding to an old version of the communication standard has participated. Is configured to perform control to notify the user. As a result, by checking the notification content notified from the control unit, the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of a predetermined communication standard in the network. Can be easily recognized.

It is an image figure showing the composition of the network system by one embodiment of the present invention. It is the block diagram which showed the structure of the set top box by one Embodiment of this invention. It is the figure which showed the warning screen displayed on the display part of the television apparatus connected to the set top box by one Embodiment of this invention. It is the figure which showed the MAC address notification screen displayed on the display part of the television apparatus connected to the set top box by one Embodiment of this invention. It is the flowchart which showed the control operation of CPU of a set top box when a warning screen and a MAC address notification screen are displayed on the display part of the television apparatus connected to the set top box by one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the configuration of a network system 1 according to an embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, a network system 1 according to an embodiment of the present invention includes a set-top box 10, two recording devices 20, and a communication adapter 30 (communication data transmitted via a LAN cable and a coaxial cable. Electronic device having a function of mutually converting communication data). The set top box 10, the two recording devices 20, and the communication adapter 30 are each connected to the home coaxial wiring 2 via a coaxial cable. The set top box 10 is an example of the “network device” in the present invention. The recording device 20 and the communication adapter 30 are examples of the “electronic device having a communication function” in the present invention.

  The set top box 10, the two recording devices 20, and the communication adapter 30 each have a communication function corresponding to the MoCA standard (Media over Coax Alliance standard). Further, the set top box 10 and the two recording devices 20 each have a communication function corresponding to the MoCA 1.1 standard (a new version of the MoCA standard). Moreover, the communication adapter 30 has a communication function corresponding to the MoCA 1.0 standard (an old version of the MoCA standard). The MoCA standard is an example of the “predetermined communication standard” in the present invention.

  Here, an outline of the MoCA standard will be described.

  The MoCA standard is a communication standard for realizing network communication using coaxial wiring. In addition, the MoCA standard includes two standards (MoCA 1.1 standard and MoCA 1.0 standard) having different versions. The MoCA 1.1 standard (a new version of the MoCA standard) stipulates that a network that exhibits a communication speed of 175 Mbps at the maximum is constructed by a maximum of 16 nodes (network configuration units). In addition, the MoCA 1.0 standard (the old version of the MoCA standard) stipulates that a network that exhibits a maximum communication speed of 125 Mbps is constructed by a maximum of eight nodes.

  The MoCA 1.1 standard is compatible with the MoCA 1.0 standard. In addition, the node of the MoCA 1.1 standard can perform not only the communication with the node of the MoCA 1.1 standard but also the communication with the node of the MoCA 1.0 standard. That is, the MoCA standard is defined so that a node of the MoCA 1.0 standard can participate in a network constructed by nodes of the MoCA 1.1 standard. When a MoCA 1.0 standard node joins a network constructed with MoCA 1.1 standard nodes in this way, a new network is constructed with the MoCA 1.0 standard node and the MoCA 1.1 standard node. The

  In addition, when a new network is constructed by the nodes of the MoCA 1.0 standard and the nodes of the MoCA 1.1 standard as described above, the communication quality of the network becomes the level of the MoCA 1.0 standard. For example, as shown in FIG. 1, communication is made with a network (see a part surrounded by a dotted line) constructed by a set-top box 10 and a recording device 20 (an electronic device having a communication function corresponding to the MoCA 1.1 standard). The adapter 30 (an electronic device having a communication function corresponding to the MoCA 1.0 standard) participates, and the set-top box 10, the two recording devices 20, and the communication adapter 30 form a new network (partial reference surrounded by an alternate long and short dash line) ) Is built, the maximum communication speed in the network decreases from 175 Mbps to 125 Mbps.

  In the MoCA standard, it is determined that one node out of a plurality of nodes constituting one network is selected as an NC (Network Coordinator) node. An NC node is a node having a function of managing a network. For example, the NC node has a function of transmitting a beacon signal for notifying all nodes on the coaxial wiring of the existence of the network, or allowing a node outside the network to participate in the network. In the present embodiment, the set top box 10 functions as an NC node.

  When a network according to the MoCA standard is constructed, first, a beacon signal is transmitted on the coaxial wiring by the NC node. Then, another node on the coaxial wiring that has received the beacon signal returns a request for participation in the network to the NC node. Then, the NC node that has received the participation request signal determines whether or not to allow other nodes to participate in the network, and a network is constructed. Note that the participation request signal includes information indicating which version of the MoCA standard node the transmission source node is and information indicating the MAC address of the transmission source node.

  Next, the configuration of the set top box 10 according to an embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 2, the set top box 10 according to an embodiment of the present invention includes a communication unit 11, a CPU 12, a memory 13, a video output unit 14, a remote control light receiving unit 15, and a remote control 16. ing. The CPU 12 is an example of the “control unit” in the present invention.

  The communication unit 11 is connected to the home coaxial wiring 2 via a coaxial cable. Further, the communication unit 11 is connected to the recording device 20 (see FIG. 1) via the home coaxial wiring 2. Further, the communication unit 11 is configured to be able to transmit and receive network signals and the like according to the MoCA standard described above.

  The CPU 12 is configured to be able to control the entire set top box 10 by executing various programs stored in the memory 13. Further, the CPU 12 is configured to be able to control the display content of the display unit 41 of the television device 40 by being connected to the television device 40 having the display unit 41 via the video output unit 14. ing. The television apparatus 40 is an example of the “electronic device having a display unit” in the present invention.

  The remote control light receiving unit 15 is configured to receive an operation signal from the remote control 16. The operation signal received by the remote control light receiving unit 15 is configured to be transmitted to the CPU 12. That is, the entire set top box 10 and the display content of the display unit 41 of the television device 40 are controlled based on the operation of the remote controller 16 by the user. The remote controller 16 is provided with operation buttons such as a cross key 16a and an enter key 16b. By using the cross key 16a or the enter key 16b of the remote controller 16, various operations such as a selection operation of a “YES” button or a “NO” button on a warning screen (see FIG. 3) described later are performed. It is configured.

  Here, in the present embodiment, the CPU 12 via the communication unit 11 has an electronic device having a communication function corresponding to the new version of the MoCA standard (for example, a recording device 20 having a communication function corresponding to the MoCA 1.1 standard (see FIG. 1))) to establish a network conforming to the new version of the MoCA standard on the home coaxial wiring 2.

  Further, the CPU 12 is connected to a network compliant with the new version of the MoCA standard in an electronic device having a communication function corresponding to the old version of the MoCA standard (for example, the communication adapter 30 having a communication function corresponding to the MoCA 1.0 standard (FIG. 1). In the case of participation), control is performed to notify the user that the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to the old version of the MoCA standard. It is configured.

  Specifically, when an electronic device having a communication function corresponding to the old version of the MoCA standard (MoCA 1.0 standard) participates in a network compliant with the new version of the MoCA standard (MoCA 1.1 standard), the CPU 12 The television device 40 displays a warning screen (see FIG. 3) for notifying the user that the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to the old version of the MoCA standard in the network. It is comprised so that the control displayed on the part 41 may be performed.

  Further, the CPU 12 displays the warning screen (see FIG. 3) on the display unit 41 of the television device 40, and then specifies an electronic device having a communication function corresponding to the old version of the MoCA standard (MoCA 1.0 standard). The MAC address notification screen (see FIG. 4) for notifying the user of the information (in this embodiment, the MAC address) is displayed on the display unit 41 of the television device 40. Yes.

  Next, referring to FIGS. 3 to 5, a warning screen (see FIG. 3) and a MAC address notification screen (see FIG. 3) are displayed on the display unit 41 of the television apparatus 40 connected to the set-top box 10 according to the embodiment of the present invention. A control flow of the CPU 12 of the set-top box 10 when the screen (see FIG. 4) is displayed will be described.

  First, as shown in FIG. 5, in step S1, it is determined whether or not a new electronic device has joined the network. In step S1, this determination is repeated until a new electronic device joins the network. When a new electronic device joins the network, the process proceeds to step S2.

  Next, in step S2, the version of the MoCA standard that is supported by the new electronic device that has joined the network is the MoCA that is compatible with the electronic device that has constituted the network before the new electronic device has joined. It is determined whether the version is older than the standard version.

  In step S2, it is assumed that the version of the MoCA standard of the new electronic device that has joined the network is the same as or newer than the version of the MoCA standard of the electronic device that has configured the network before the new electronic device has joined. If it is determined, the process is terminated. In step S2, it is determined that the MoCA standard version of the new electronic device that has joined the network is older than the MoCA standard version of the electronic device that has constituted the network before the new electronic device joined. If YES, go to step S3.

  In the following, as shown in FIG. 1, a network conforming to the MoCA 1.1 standard constructed by the set top box 10 and the two recording devices 20 (see the part surrounded by a dotted line) is referred to from the MoCA 1.1 standard. A case where a new network (refer to a part surrounded by a one-dot chain line) is constructed by participation of the communication adapter 30 corresponding to the old version of the MoCA 1.0 standard will be described. The determination in step S2 is based on the information (communication adapter 30) included in the participation request signal transmitted from the communication adapter 30 to the set top box 10 (NC node of the network) when the communication adapter 30 joins the network. Is based on which version of the MoCA standard is supported).

  Next, in step S3, a warning screen (see FIG. 3) for notifying the user that the communication quality of the network has deteriorated due to the participation of the communication adapter 30 in the network is displayed on the display unit 41 of the television device 40. Is done. As shown in FIG. 3, the warning screen displays a message notifying the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function compatible with the MoCA 1.0 standard. Further, on this warning screen, whether or not to display the MAC address notification screen (see FIG. 4) for notifying the MAC address of the electronic device having the communication function corresponding to the MoCA 1.0 standard on the display unit 41 of the television apparatus 40. Two selection buttons (a “YES” button and a “NO” button) are provided to allow the user to select the item.

  Next, in step S4, it is determined whether or not an operation for displaying the MAC address notification screen (see FIG. 4) on the display unit 41 of the television device 40 has been performed by the user. Specifically, in the state where the warning screen (see FIG. 3) is displayed on the display unit 41 of the television apparatus 40, the warning screen has two selection buttons (“YES” button and “NO” button). It is determined whether or not the “YES” button has been selected and determined by the user's operation (selection determination operation using the cross key 16a or the determination key 16b of the remote controller 16).

  If it is determined in step S4 that the “YES” button on the warning screen (see FIG. 3) has been selected by a user operation (selection determination operation using the cross key 16a or the determination key 16b of the remote controller 16), Proceed to step S5. In step S5, a MAC address notification screen (see FIG. 4) for notifying the user of the MAC address of the communication adapter 30 is displayed on the display unit 41 of the television device 40, and the process ends. The user can improve the communication quality of the network by removing the communication adapter 30 corresponding to the MAC address displayed on the MAC address notification screen from the network.

  Further, when it is determined in step S4 that the “NO” button on the warning screen (see FIG. 3) has been selected by the user's operation (selection determination operation using the cross key 16a or the determination key 16b of the remote controller 16). Advances to step S6. In step S6, the display of the warning screen is erased, and the process ends.

  In the present embodiment, as described above, the CPU 12 communicates with an electronic device having a communication function compatible with the new version of the MoCA standard (for example, the recording apparatus 20 having a communication function compatible with the MoCA 1.1 standard). When a network having a communication function corresponding to the old version of the MoCA standard (for example, the communication adapter 30 having a communication function corresponding to the MoCA 1.0 standard) participates in the network constructed by the above, the old version of the MoCA standard is supported. Control is performed to notify the user that the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function. Thereby, the user can easily confirm that the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to the old version of the MoCA standard in the network by confirming the notification content notified from the CPU 12. Can be recognized.

  In the present embodiment, as described above, when an electronic device having a communication function corresponding to the old version of the MoCA standard participates in the network, the CPU 12 has an electronic function having a communication function corresponding to the old version of the MoCA standard. Control is performed to display on the display unit 41 of the television device 40 a screen for notifying the user that the communication quality of the network has deteriorated due to the participation of the device. Thereby, by visually checking the display unit 41, it is possible to easily visually recognize that the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to the old version of the MoCA standard. it can.

  In the present embodiment, as described above, the set top box 10 is notified to the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to the old version of the MoCA standard. It is connected to a television device 40 having a display unit 41 on which a notification screen is displayed. As a result, even if the set top box 10 does not have a display unit, the communication quality of the network is reduced due to the participation of an electronic device having a communication function corresponding to the old version of the MoCA standard. The notification screen can be displayed on the display unit 41 of the television device 40 connected to the set top box 10. As a result, it is possible to reliably visually recognize that the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to the old version of the MoCA standard.

  In the present embodiment, as described above, the CPU 12 notifies the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to the old version of the MoCA standard. Is displayed on the display unit 41, and a screen for notifying the user of information for specifying an electronic device having a communication function corresponding to the old version of the MoCA standard can be displayed on the display unit 41. It is configured. Accordingly, when a screen for notifying the user of information for specifying an electronic device having a communication function corresponding to the old version of the MoCA standard is displayed on the display unit 41, the network can be viewed by viewing the screen. It is possible to acquire information that identifies the electronic device that is the cause of the deterioration in communication quality. Moreover, the communication quality of a network can be improved by removing the electronic device specified based on the acquired information from the network.

  In the present embodiment, as described above, the information for specifying the electronic device having the communication function corresponding to the old version of the MoCA standard is the MAC of the electronic device having the communication function corresponding to the old version of the MoCA standard. Address. If comprised in this way, based on a MAC address, the electronic device which has a communication function corresponding to the old version of MoCA specification can be specified easily.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example in which a set-top box is used as the network device of the present invention is shown, but the present invention is not limited to this. As the network device of the present invention, for example, a recording device, a communication adapter, a television device, or the like may be used. Note that when a television device is used as the network device of the present invention, unlike the case where a set-top box is used as the network device of the present invention, it is not necessary to connect the network device to an electronic device having a display unit.

  Moreover, although the example which uses a video recording apparatus and a communication adapter as an electronic device which has a communication function of this invention was shown in the said embodiment, this invention is not limited to this. As an electronic device having a communication function of the present invention, for example, a set-top box having a communication function, a television device, or the like may be used.

  Moreover, although the example which uses a television apparatus as an electronic device which has a display part of this invention was shown in the said embodiment, this invention is not limited to this. As an electronic apparatus having the display unit of the present invention, for example, a monitor device for a PC (Personal Computer) may be used.

  Moreover, in the said embodiment, although the set top box which notifies a user using the display part that the communication quality of the network fell because the electronic device which has a communication function corresponding to MoCA1.0 standard participated was shown. The present invention is not limited to this. In the present invention, a set-top box may be used to notify the user using voice that the network communication quality has decreased due to the participation of an electronic device having a communication function compatible with the MoCA 1.0 standard.

  Moreover, in the said embodiment, although the set top box which constructs | assembles the network based on MoCA specification on coaxial wiring was shown, this invention is not limited to this. The present invention may be a set-top box that constructs a network based on a standard other than the MoCA standard (for example, a DOCSIS standard (Data Over Cable Service Interface Specifications standard)) on the coaxial wiring.

1 Network system 2 Domestic coaxial wiring (coaxial wiring)
10 Set-top box (network device)
11 Communication unit 12 CPU (control unit)
20 Recording device (electronic equipment with communication function)
30 Communication adapter (electronic equipment with communication function)
40 Television apparatus (electronic device having a display unit)
41 Display

Claims (6)

A communication unit connected to an electronic device having a communication function corresponding to a new version of a predetermined communication standard via a coaxial wiring;
A network is constructed on the coaxial wiring by communicating with an electronic device having a communication function corresponding to the new version of the predetermined communication standard via the communication unit, and the predetermined communication is performed on the constructed network. When an electronic device having a communication function corresponding to an old version of the standard participates, the communication quality of the network has deteriorated due to the participation of an electronic device having a communication function corresponding to the old version of the predetermined communication standard And a control unit that performs control to notify the user.   When the electronic device having a communication function corresponding to the old version of the predetermined communication standard participates in the network, the electronic device having a communication function corresponding to the old version of the predetermined communication standard participates in the control unit. The network device according to claim 1, wherein the network device is configured to perform control to display a screen for notifying the user that the communication quality of the network has deteriorated as a result.   The network device displays a screen for notifying the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of the predetermined communication standard. The network device according to claim 2, wherein the network device is connected to an electronic device having a display unit.   The control unit displays on the display unit a screen for notifying the user that the communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of the predetermined communication standard. The display unit is configured to display a screen for notifying the user of information for specifying an electronic device having a communication function corresponding to an old version of the predetermined communication standard. The network device according to claim 2, wherein:   The information for specifying an electronic device having a communication function corresponding to the old version of the predetermined communication standard is a MAC address of the electronic device having a communication function corresponding to the old version of the predetermined communication standard. 5. The network device according to 4.   A communication unit connected to an electronic device having a communication function corresponding to a new version of a predetermined communication standard via a coaxial wiring, and a communication function corresponding to a new version of the predetermined communication standard via the communication unit A network is constructed on the coaxial wiring by communicating with an electronic device, and the electronic device having a communication function corresponding to an old version of the predetermined communication standard participates in the constructed network. A network device including a control unit that performs control to notify a user that communication quality of the network has deteriorated due to participation of an electronic device having a communication function corresponding to an old version of the communication standard of system.

Images