JP5478660B2 - Navigation device - Google Patents

Description

  The present invention relates to a navigation device that is mounted on a vehicle and guides a user to a destination, and more particularly, to a navigation device having a reception function for digital terrestrial broadcasting.

  In recent years, with the enhancement of functionality of navigation devices, navigation devices having a digital broadcast receiving function have been developed. In such a navigation apparatus, an electronic program guide (EPG) that can be used as a guideline when a user views a desired program from a plurality of programs broadcast from a plurality of broadcasting stations is realized. ing. If this EPG is used, the user can easily select a desired program while checking the program content and broadcast time displayed on the television screen.

  By the way, since digital broadcasting is broadcast on many channels, the user is often confused about selecting a program that the user desires to view. In such a case, the audience rating information of the program is effective as a judgment material when the user selects the program. However, at present, since the audience rating of a program is announced at the earliest day after the broadcast date of the program, the user cannot know popular programs in real time. If the program is broadcast weekly, you can refer to the audience rating announced on or after the next day of the program's broadcast date. For special programs that are broadcast only once, refer to this audience rating. I can't. Therefore, an audience rating totaling system that allows users to know the audience rating in real time has been developed (see, for example, Patent Document 1).

  In the audience rating totaling system disclosed in Patent Document 1, a broadcasting station broadcasts digital broadcasting. The television receiver receives a digital broadcast broadcast from a broadcast station and displays it on a display. On the other hand, the television receiver notifies the audience rating totaling server of viewing information regarding the channel that the user is viewing at an appropriate timing. The audience rating totaling server counts the audience ratings of each channel (program) based on the viewing information notified from each television receiver. This aggregated audience rating is broadcast via a broadcasting station and provided to the user through the display of the television receiver. According to this audience rating totaling system, in addition to the program information obtained by EPG, the user can know the audience rating of the program at the present time by numbers, so that it can be used as a reference for viewing the program. .

JP 2003-244731 A

  However, with the above-described conventional technology, when a car navigation device equipped with a reception function for digital terrestrial broadcasting that is broadcast on a regional basis moves over a long distance, it can be viewed in the current location and in the middle of the move or the destination location. Since the broadcasting stations are different, there is a problem that the program cannot be viewed while moving or the program is switched to another program.

  In addition, when the car navigation device communicates in real time with an audience rating totaling server that counts audience ratings, if the communication environment deteriorates, the reliability of the audience ratings aggregated by the audience rating totaling server is impaired. There is a fear.

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to provide a navigation device capable of presenting TV broadcast program information in a form that can contribute to user program selection even while moving. It is to provide.

In order to solve the above problems, a navigation device according to the present invention includes a tuner that receives terrestrial digital broadcasting, a video signal processing unit that extracts program information from a signal received by the tuner and generates a video signal, Program information based on the video signal generated by the video signal processing unit, a display unit for displaying a plurality of route candidate selection buttons , a position detection unit for detecting the current position, and an input device for inputting a destination a route calculator for calculating an arrival time to a predetermined point on said plurality of path candidates and said plurality of path candidates from the detected position by the position detecting unit to a destination inputted by said input device, said program information, based on the plurality of candidate routes and the arrival time, the broadcasting station of the program in the current location, receiving condition of the broadcast station of the program at a given point on the plurality of path candidates , And a control unit for creating a broadcasting station changes the table representing arranged in the order of the predetermined point for each of the plurality of path candidates, wherein, when the program in the current position is also broadcast in the destination, the program Is generated at the destination, the video signal processing unit generates a video signal for displaying the message generated by the control unit, and the display unit The message is displayed together with a route candidate selection button .

  According to the navigation device of the present invention, since it is possible to know the reception status of a predetermined program at a predetermined point on the route to the destination, even if the broadcast area changes with movement, The user can easily select a desired program.

It is a block diagram which shows the structure of the navigation apparatus which concerns on Embodiment 1 of this invention. It is a flowchart (the 1) which shows operation | movement of the navigation apparatus which concerns on Embodiment 1 of this invention. It is a flowchart (the 2) which shows operation | movement of the navigation apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the detail of the server process performed by step ST18 of the flowchart shown in FIG. It is a figure which shows the broadcasting station change table used with the navigation apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the viewing-and-listening state table used with the navigation apparatus concerning Embodiment 1 of this invention. It is a figure which shows the example of the viewing-and-listening program selection screen displayed with the navigation apparatus concerning Embodiment 1 of this invention. It is a figure which shows the example of the route selection screen displayed with the navigation apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the other example of the route selection screen displayed with the navigation apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the screen displayed on the navigation apparatus which concerns on Embodiment 1 of this invention, and inquires the propriety of the switching of a broadcast station. It is a figure which shows the example of the screen displayed on the navigation apparatus which concerns on Embodiment 1 of this invention, and inquires whether the switching of a local broadcast station is possible. It is a figure which shows the example of the message to the effect that the broadcasting station becomes out of service area displayed with the navigation apparatus which concerns on Embodiment 1 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing a configuration of a navigation apparatus according to Embodiment 1 of the present invention. The navigation device includes an input device 1, a GPS (Global Positioning System) receiver 2, a television tuner (hereinafter abbreviated as “TV tuner”) 3, a storage device 4, a communication unit 5, a microcomputer (hereinafter “microcomputer”). 6), an audio signal processing unit 7, an amplifier 8, a speaker 9, a video signal processing unit 10, and a display 11.

  The input device 1 generates an instruction signal according to a user operation and sends it to the microcomputer 6. Examples of the input device 1 include a button that generates an instruction signal according to a manual operation of a user, a remote controller or a touch panel, and a voice input device with a voice recognition function that recognizes a voice spoken by the user and generates an instruction signal. And so on. The GPS receiver 2 receives radio waves from GPS satellites orbiting the earth and calculates its position (latitude and longitude). The self position calculated in the GPS receiver 2 is sent to the microcomputer 6 as a position signal.

  The TV tuner 3 corresponds to the tuner of the present invention, and receives digital terrestrial broadcasts transmitted from broadcast stations installed in various places. An area covered by one broadcast station is called a “broadcast area”, and usually the broadcast stations are arranged so that the broadcast areas overlap. A signal obtained by receiving the terrestrial digital broadcast by the TV tuner 3 is sent to the audio signal processing unit 7 and the video signal processing unit 10.

  The storage device 4 is configured by, for example, an HDD (Hard Disk Drive), and stores various data for realizing a navigation function and a television function in addition to the map data. This storage device 4 is accessed by the microcomputer 6. The medium for storing the map data is not limited to the HDD, and a DVD (Digital Versatile Disk) or a CD (Compact Disc) can also be used. In this case, a drive device that reads map data from these media is connected to the microcomputer 6.

  The communication unit 5 is composed of, for example, a mobile phone or a wireless communication device, and controls real-time communication between the microcomputer 6 and the external server 20 in response to an instruction from the microcomputer 6. The communication unit 5 receives audience rating information from the server 20 and sends it to the microcomputer 6, and transmits the viewing information sent from the microcomputer 6 to the server 20. Here, the viewing information is information representing the channel being viewed.

  The microcomputer 6 realizes a navigation function, a television function, and the like by controlling the entire navigation device. Details of the microcomputer 6 will be described later.

  The audio signal processing unit 7 is composed of, for example, a DSP (Digital Signal Processor), and generates an audio signal by processing a signal sent from the TV tuner 3 and a signal sent from the microcomputer 6. The audio signal generated in the audio signal processing unit 7 is sent to the amplifier 8.

  The amplifier 8 is composed of a power amplifier, amplifies the audio signal sent from the audio signal processing unit 7 and sends it to the speaker 9. The speaker 9 converts the audio signal sent from the amplifier 8 into audio and outputs it. As a result, for example, terrestrial digital broadcasting voice or guidance voice at the time of route guidance is output.

  The video signal processing unit 10 processes a signal sent from the TV tuner 3 and a signal sent from the microcomputer 6 to generate a video signal for displaying a television screen or a navigation screen. The video signal generated in the video signal processing unit 10 is sent to the display 11.

  The display 11 corresponds to the display unit of the present invention, and is composed of, for example, an LCD (Liquid Crystal Display). The display 11 displays a video based on the video signal sent from the video signal processing unit 10. For example, when the television function is used on the display 11, program information (for example, EPG) including audience rating information is displayed in addition to the digital terrestrial broadcast video, and the navigation function is used. Is displayed by superimposing a vehicle position mark or a route from the current position to the destination on a map around the vehicle position.

  The server 20 calculates the audience rating by counting in real time viewing information transmitted from a navigation device having a television function mounted on a vehicle or a television receiver installed in a home or the like. The audience rating calculated in the server 20 is transmitted to the request source as audience rating information in response to a request from the navigation device or the television receiver.

  Next, details of the microcomputer 6 will be described. The microcomputer 6 includes a position detection unit 31, a route calculation unit 32, and a control unit 33 realized by a program. The microcomputer 6 executes processing for realizing various functions, although details are omitted in addition to the functions realized by these components. These various functions will be described as they appear below.

  The position detection unit 31 detects its current position by performing map matching using the position signal sent from the GPS receiver 2 and the map data read from the storage device 4. The current position detected by the position detector 31 is sent to the controller 33 and the route calculator 32 as current position data.

  The route calculation unit 32 uses the position indicated by the current position data sent from the position detection unit 31 as a departure point, and reads a plurality of route candidates to the destination input from the input device 1 from the storage device 4. While calculating based on map data, the arrival time to the predetermined | prescribed point (for example, waypoint etc.) on each route candidate is calculated. The plurality of route candidates calculated by the route calculation unit 32 and arrival times at predetermined points on each route candidate are sent to the control unit 33 as route data.

  The control unit 33 instructs the communication unit 5 to acquire audience rating information that can be received at the current position, specifically, the position indicated by the current position data sent from the position detection unit 31. In response to this instruction, the communication unit 5 acquires the audience rating information received from the server 20 and sends it to the video signal processing unit 10. Further, the control unit 33 instructs the communication unit 5 to acquire audience rating information that can be received at a predetermined point on the route indicated by the route data sent from the route calculation unit 32, and responds to this instruction. The communication unit 5 acquires the audience rating information received from the server 20 and sends it to the video signal processing unit 10. Further, the control unit 33 generates a message recommending a program with a high audience rating or a message recommending a program broadcast locally in the broadcasting region to which the current position belongs, and sends the message to the video signal processing unit 10. Furthermore, the control unit 33 transmits viewing information to the server 20 via the communication unit 5.

  Next, the operation of the navigation device according to Embodiment 1 of the present invention configured as described above will be described with reference to the flowcharts shown in FIGS. 2 to 4, the explanatory diagrams shown in FIGS. 5 and 6, and FIGS. This will be described with reference to the display screen example shown in FIG.

  In this navigation device, first, the current position is calculated (step ST11). That is, the position detection unit 31 of the microcomputer 6 detects its current position by performing map matching using the position signal sent from the GPS receiver 2 and the map data read from the storage device 4, This detected current position is sent to the control unit 33 and the route calculation unit 32 as current position data.

  Next, presetting of the broadcasting station is performed (step ST12). That is, the microcomputer 6 presets a broadcasting station for terrestrial digital broadcasting that is preliminarily defined as being receivable at the current position calculated in step ST11. Next, it is checked whether or not the user has performed an operation for instructing auto search (step ST13). That is, the microcomputer 6 checks whether or not an instruction signal for instructing auto search is sent from the input device 1.

  If it is determined in step ST13 that an operation for instructing an auto search has been performed, an auto search for a broadcasting station is performed (step ST14). That is, the microcomputer 6 checks whether or not the TV tuner 3 can receive the terrestrial digital broadcast while sequentially changing the channel, and creates a list of broadcast stations of the received terrestrial digital broadcast. Data representing the list of broadcast stations is sent to the display 11 via the video signal processing unit 10. As a result, broadcast stations that can actually be received at the current position are displayed on the display 11. On the other hand, if it is determined in step ST13 that an operation for instructing an auto search has not been performed, the process of step ST14 is skipped.

  Next, it is checked whether or not the destination has been set by the user (step ST15). That is, the microcomputer 6 checks whether or not an instruction signal indicating the destination is sent from the input device 1. If it is determined in step ST15 that the destination has been set, route calculation is performed (step ST16). That is, the route calculation unit 32 of the microcomputer 6 stores a plurality of route candidates to the destination input from the input device 1 using the position indicated by the current position data sent from the position detection unit 31 as a departure point. While calculating based on the map data read from the device 4, the arrival time at a predetermined point on each route candidate is calculated and sent to the control unit 33 as route data. On the other hand, if it is determined in step ST15 that the destination is not set, the process in step ST16 is skipped.

  Next, a broadcast station change table is created (step ST17). That is, the video signal processing unit 10 extracts program information from a signal sent from the TV tuner 3 that has received the terrestrial digital broadcast, and sends the program information to the control unit 33 of the microcomputer 6. The control unit 33 receives program information sent from the video signal processing unit 10, audience rating information sent from the communication unit 5, route candidates sent from the route calculation unit 32, and predetermined routes on the route candidates. Based on the arrival time at the point, a broadcast station change table as shown in FIG. 5 is created.

  In this broadcast station change table, for example, the program 1 indicated by the program information has a current audience rating of 13% and is broadcast by the A broadcast station, and is broadcast by the A broadcast station at the point 1 arriving at 2 o'clock. This means that reception is impossible at point 2 arriving at 3 o'clock, broadcasting is performed by the C broadcasting station at point 3 arriving at 4 o'clock, and broadcasting is performed by the C broadcasting station at a destination arriving at 6 o'clock. When the route candidate is not calculated by the route calculation unit 32, a broadcast station change table including the audience rating and the broadcast station name of each program at the current location is created.

  Next, server processing is executed (step ST18). Details of this server processing will be described with reference to the flowchart shown in FIG. In the server process, a viewing state table as shown in FIG. 6 is referred to. The viewing state table includes items such as a channel number (CH_No.), A broadcasting station, a program, viewing and transmission, and is used for controlling communication with the server 20.

  In the server process, it is first checked whether or not audience rating information can be received from the server (step ST41). In a moving navigation apparatus, since the communication environment changes depending on the position or time, there are cases where communication cannot be performed in real time. Therefore, first, it is checked whether communication between the communication unit 5 and the server 20 is possible.

  If it is determined in step ST41 that audience rating information can be received from the server, the audience rating information is downloaded (step ST42). In this case, in response to the instruction from the control unit 33, the communication unit 5 receives from the server 20 the current position calculated in step ST11, the predetermined point on the route candidate calculated in step ST16, and the input device 1. The audience rating information at the set destination is selectively received and sent to the control unit 33. If it is determined in step ST41 that audience rating information cannot be received from the server, the process of step ST42 is skipped.

  Next, it is checked whether viewing is confirmed and transmission is waiting (step ST43). In other words, the microcomputer 6 checks whether or not there is a program whose viewing is “determined” and whose transmission is “waiting” in the viewing state table. If it is determined in this step ST43 that viewing is confirmed and there is no waiting for transmission, the sequence returns from this server processing and returns to step ST19.

  On the other hand, if it is determined in step ST43 that viewing is confirmed and there is a waiting for transmission, it is then checked whether viewing information can be transmitted to the server (step ST44). That is, it is checked whether communication between the communication unit 5 and the server 20 is possible. If it is determined in step ST44 that viewing information cannot be transmitted to the server, the sequence returns from this server process and returns to step ST19.

  If it is determined in step ST44 that the viewing information can be transmitted to the server, then the viewing information is uploaded (step ST45). That is, in response to an instruction from the control unit 33, the communication unit 5 transmits viewing information including a channel, a broadcasting station, and a program that are confirmed and waiting to be transmitted to the server 20. Thus, when communication with the server 20 is impossible, the viewing information is stored as viewing confirmation and waiting for transmission, and when communication with the server 20 becomes possible, the stored viewing information is stored. Since it is configured to transmit to the server 20, viewing information generated in a state where communication with the server 20 is impossible can also be transmitted to the server 20. Therefore, the server 20 can calculate an accurate audience rating.

  Next, the viewing state table is updated so that viewing is confirmed and transmitted (step ST46). That is, the microcomputer 6 updates the item of transmission in the viewing state table corresponding to the program whose viewing information has been uploaded in step ST45 to “completed”. Thereafter, the sequence returns from this server process and returns to step ST19.

  In step ST19, when the user presses a television switch (not shown) provided in the navigation device, for example, a broadcast program guide table is displayed. That is, the video signal processing unit 10 generates a video signal including the audience rating information acquired by the server processing in step ST18 from the EPG information obtained by receiving the terrestrial digital broadcast, and sends the video signal to the display 11. As a result, a display program selection screen including a list of program names including the audience rating is displayed on the display 11 so as to be superimposed on a television broadcast screen or a navigation map screen as shown in FIG. Thus, when selecting a viewing channel, the user can determine which program is to be viewed with reference to the video, audio, viewing information (EPG information) and viewing rate of the program.

  Next, when the user selects one program from the viewing program selection screen, viewing start processing is performed (step ST20). Specifically, the channel, broadcast station, and program selected by the user are additionally stored in the viewing status table, the viewing time timer is initialized, and then the program broadcast on the selected channel Watching starts. Next, it is checked whether or not the channel has been changed (step ST21). If it is determined in step ST21 that the channel has been changed, the sequence returns to step ST20, and the above-described viewing start process is repeated again.

  If it is determined in step ST21 that the channel has not been changed, then it is checked whether there is a change in the broadcast program, that is, whether the program broadcast on the channel being viewed has changed to another program. (Step ST22). If it is determined in step ST22 that there is a change in the broadcast program, the viewing state table is cleared (step ST23). That is, the channel, broadcast station, and program stored in step ST20 are cleared. On the other hand, if it is determined in step ST22 that there is no change in the broadcast program, the process in step ST23 is skipped.

  Next, it is checked whether or not viewing has been confirmed (step ST24). That is, it is checked whether the viewing time timer initialized in the viewing start process of step ST20 has passed 60 seconds and whether the viewing of the viewing state table is the initial value (not determined). If it is determined in this step ST24 that viewing has been confirmed, “confirmed” is set to viewing in the viewing state table (step ST25). If it is determined in step ST24 that viewing has not been confirmed, the process in step ST25 is skipped.

  Next, it is checked whether or not there is a route change (step ST26). In step ST26, first, a route selection screen including program names that can be viewed on the currently set route as shown in FIG. 8A is displayed. The user can change the current route by operating the route 1 to route 4 buttons. For example, when the route 2 button is pressed, a route selection screen as shown in FIG. 8A is displayed. The user can select a desired route with reference to programs that can be viewed on each route. In particular, when traveling on a long distance, it can help to determine the route.

  If it is determined in step ST26 that there is a route change, the sequence returns to step ST16, and the above-described processing after the creation of the broadcast station change table is repeated. On the other hand, if it is determined in step ST26 that there is no route change, it is then checked whether there is a change in the destination (step ST27). If it is determined in step ST27 that the destination has been changed, the sequence returns to step ST16, and the above-described processing after the route calculation is repeated.

  If it is determined in step ST27 that there is no change in the destination, it is then checked whether or not the change position in the broadcast area has been reached (step ST28). That is, the broadcast station change table created in step ST17 is referred to and it is checked whether or not the vehicle position has reached a point where the broadcast area is changed. If it is determined in step ST28 that the broadcast area change position has been reached, a new broadcast area guidance display is performed (step ST29). That is, when the vehicle position moves across the broadcasting area, a notification that the broadcasting area changes is given, and the user is informed whether to display a high audience rating program or a local program in the area, or automatically. Switch.

  Next, a tuner setting process is performed (step ST30). That is, the broadcast station or frequency corresponding to the broadcast area after the change is reset. If it is determined in step ST28 that the broadcast area change position has not been reached, the processes in steps ST29 and ST30 are skipped. Next, other processing is performed (step ST31). The process in step ST31 includes a process for realizing a navigation function such as a map display process, a guidance guide process, and the like. Thereafter, the sequence returns to step ST11, and the above-described processing is repeated.

  As described above, according to the navigation device according to the first embodiment of the present invention, the program information is displayed so that the audience rating information is included in the program information. Television broadcast program information can be presented in a form that can contribute. As a result, even when the broadcast area changes with movement, the user can know a program with a high audience rating in the broadcast area where the user is present, and can use it as a reference for program selection.

  In the navigation apparatus according to Embodiment 1 described above, route calculation is performed to create a broadcast station change table, and the same program as the currently viewed program is broadcast in the destination column of this broadcast station change table. If it is stored, the currently selected program “2ch: general news 21 audience rating 32%” is displayed on the viewing program selection screen shown in FIG. It is also possible to display a message indicating that viewing is possible.

  Further, when it is necessary to switch the broadcasting station being viewed, when the same program is broadcast on another broadcasting station, a message asking whether switching is possible is displayed as shown in FIG. can do. According to this configuration, when the user wants to view the same program, the user can continuously view the same program by performing a predetermined operation in response to the message.

  Further, when the broadcast area is changed by movement and a local broadcast station in the new broadcast area can be received, a message asking whether or not switching to the local broadcast station is possible is displayed as shown in FIG. Can be configured. According to this configuration, the user can easily select a local broadcast station.

  Further, by leaving the previous broadcasting area by moving, it becomes impossible to receive the program that has been viewed so far, that is, when the program is out of the broadcasting station range, as shown in FIG. It can be configured to display a message to that effect. According to this configuration, the user can know in advance that the program being viewed cannot be received. In this case, it is also possible to present a route that can continue viewing.

  1 input device, 2 GPS receiver, 3 TV tuner, 4 storage device, 5 communication unit, 6 microcomputer, 7 audio signal processing unit, 8 amplifier, 9 speaker, 10 video signal processing unit, 11 display, 20 server, 31 position Detection unit, 32 path calculation unit, 33 control unit.

Claims (4)

A tuner for receiving terrestrial digital broadcasting;
A video signal processing unit that extracts program information from a signal received by the tuner and generates a video signal;
A display unit that displays program information based on the video signal generated by the video signal processing unit, and a plurality of route candidate selection buttons ;
A position detector for detecting the current position;
An input device for inputting a destination;
A route calculator for calculating an arrival time to a predetermined point on said plurality of path candidates and said plurality of path candidates from the detected position by the position detecting unit to a destination inputted by said input device,
Based on the program information, the plurality of route candidates, and the arrival time, the broadcast status of the program at the current location, the reception status of the broadcast stations of the program at a predetermined location on the plurality of route candidates , in the order of the predetermined locations A control unit that creates a broadcast station change table that is displayed side by side for each of the plurality of route candidates ,
The controller is
If the program at the current location is also broadcast at the destination, generate a message that the program can be viewed at the destination,
The video signal processing unit generates a video signal for displaying the message generated by the control unit ,
The display unit
The navigation device , wherein the message is displayed together with a selection button for the plurality of route candidates . A tuner for receiving terrestrial digital broadcasting;
A video signal processing unit that extracts program information from a signal received by the tuner and generates a video signal;
A display unit that displays program information based on the video signal generated by the video signal processing unit, and a plurality of route candidate selection buttons ;
A position detector for detecting the current position;
An input device for inputting a destination;
A route calculator for calculating an arrival time to a predetermined point on said plurality of path candidates and said plurality of path candidates from the detected position by the position detecting unit to a destination inputted by said input device,
Based on the program information, the plurality of route candidates, and the arrival time, the broadcast status of the program at the current location, the reception status of the broadcast stations of the program at a predetermined location on the plurality of route candidates , in the order of the predetermined locations A control unit that creates a broadcast station change table that is displayed side by side for each of the plurality of route candidates ,
The controller is
When it is detected that the broadcasting area of digital terrestrial broadcasting has changed based on the position detected by the position detection unit, among programs that can be received at the position, programs that are broadcast locally in the broadcasting area Generate a message asking whether to switch,
The video signal processing unit generates a video signal for displaying the message generated by the control unit ,
The display unit
The navigation device , wherein the message is displayed together with a selection button of the plurality of route candidates . A tuner for receiving terrestrial digital broadcasting;
A video signal processing unit that extracts program information from a signal received by the tuner and generates a video signal;
A display unit that displays program information based on the video signal generated by the video signal processing unit, and a plurality of route candidate selection buttons ;
A position detector for detecting the current position;
An input device for inputting a destination;
A route calculator for calculating an arrival time to a predetermined point on said plurality of path candidates and said plurality of path candidates from the detected position by the position detecting unit to a destination inputted by said input device,
Based on the program information, the plurality of route candidates, and the arrival time, the broadcast status of the program at the current location, the reception status of the broadcast stations of the program at a predetermined location on the plurality of route candidates , in the order of the predetermined locations A control unit that creates a broadcast station change table that is displayed side by side for each of the plurality of route candidates ,
The controller is
When the broadcasting area of the digital terrestrial broadcasting changes based on the position detected by the position detecting unit and the currently viewed program cannot be received, a message is generated to the effect that the currently viewed program cannot be viewed. ,
The video signal processing unit generates a video signal for displaying the message generated by the control unit ,
The display unit
The navigation device , wherein the message is displayed together with a selection button for the plurality of route candidates . A tuner for receiving terrestrial digital broadcasting;
A video signal processing unit that extracts program information from a signal received by the tuner and generates a video signal;
A display unit that displays program information based on the video signal generated by the video signal processing unit, and a plurality of route candidate selection buttons ;
A position detector for detecting the current position;
An input device for inputting a destination;
A route calculator for calculating an arrival time to a predetermined point on said plurality of path candidates and said plurality of path candidates from the detected position by the position detecting unit to a destination inputted by said input device,
Based on the program information, the plurality of route candidates, and the arrival time, the broadcast status of the program at the current location, the reception status of the broadcast stations of the program at a predetermined location on the plurality of route candidates , in the order of the predetermined locations A control unit that creates a broadcast station change table that is displayed side by side for each of the plurality of route candidates ,
The controller is
When the broadcasting area of the digital terrestrial broadcasting changes based on the position detected by the position detection unit and the currently viewed program cannot be received, a route through which the currently viewed program can be viewed is presented .
The display unit
The navigation apparatus, characterized in that a route capable of continuing to watch the program being viewed is displayed together with the selection buttons of the plurality of route candidates .

Images