JP4130591B2 - Information display system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a vehicle-side in-vehicle system that receives service information transmitted from road-side infrastructure and performs driving support, and more particularly, to an information display system that displays information according to received service information.
[0002]
[Prior art]
In recent years, ITS (Intelligent Transport System) has been developed as a technology for optimizing road traffic safety using information communication technology. One of the ITSs is AHS (Advanced Cruise-Asist Highway System). In the AHS, a road-side system (road-side infrastructure) and a vehicle-side in-vehicle system communicate with each other so that roads and vehicles are integrated to provide driving support (predetermined service).
[0003]
One form of driving support is information provision, and information on events (for example, curves, stopped vehicles, intersections, etc.) to be serviced is provided to vehicle occupants (particularly drivers). Examples of providing information to the driver include a method of displaying information using a display device provided in the vehicle (see, for example, Patent Documents 1 and 2).
[0004]
[Patent Document 1]
JP 2001-101593 A
[Patent Document 2]
JP 2001-101594 A
[0005]
[Problems to be solved by the invention]
By the way, from the viewpoint of providing information to the driver, it is preferable to display the received service information on the driver in more detail. The information to be displayed to the driver includes, for example, the event subject to the service, alerting the event, and the like. Therefore, in the technique disclosed in the above-mentioned patent document, more information is provided to the driver by displaying symbols corresponding to the information in parallel on the display screen. However, when symbols and the like are displayed on a display screen having a limited space, the more detailed information is displayed, the more symbols to be displayed (or the more complicated the symbols are). Therefore, the amount of information on the display screen increases, and it may be difficult to understand this information. For this reason, it takes time to select necessary information, and there is a possibility that it takes time from receiving information to driving operation. In particular, a driver who is unfamiliar with driving (for example, a driving beginner) often has difficulty in gazing at a display screen while performing a driving operation, and such a possibility is likely to occur.
[0006]
The present invention has been made in view of such circumstances, and an object thereof is to display information to such an extent that it can be easily understood.
[0007]
[Means for Solving the Problems]
  To solve this problem,The present invention provides an information display system for receiving information on an event to be serviced from a road side infrastructure as service information in a service section set on a road and displaying information corresponding to the received service information. To do. The information display system includes a communication device that receives service information transmitted from a road-side infrastructure, a computer that determines a symbol to be displayed based on the received service information, and a symbol that is controlled and determined by the computer. A display device for displaying. Here, the computer has a first control mode and a second control mode as control modes for controlling the display device. When the communication device receives the service information, the computer controls the display device to display a single symbol including a plurality of service information that can be received from the road-side infrastructure in the first control mode. In the second control mode, the display device is controlled to display symbols embodying the received service information rather than a single symbol. Further, the computer selects the first control mode until an event related to service information passes, and selects the second control mode after passing an event related to service information.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a block diagram showing an overall configuration of a driving support system to which the information display system according to the present embodiment is applied. The driving support system 1 is an AHS as an example, and includes an information display system 10 that functions as an in-vehicle system and a road-side infrastructure 20. In the AHS 1, the information display system 10 and the road-side infrastructure 20 communicate with each other to perform predetermined travel support (service). In AHS1, the services operated by the system include support for preventing danger of entering the curve, support for providing road surface information, support for preventing collision at the time of approach (support at the time of approach), support for preventing collision at the time of collision (support at the time of start), support for preventing right turn collision, and walking on pedestrian crossings. Services such as support for preventing people from colliding are proposed. By performing these services between roads and vehicles, basically, information on events (for example, the presence of a curve, road surface conditions, stopped vehicles, oncoming vehicles at intersections, etc.) targeted by the service is obtained. To the information display system 10.
[0018]
Here, before describing the information display system 10 that is one of the features of the present embodiment, the road-side infrastructure 20 will be described first. FIG. 2 is an explanatory diagram showing the road-side infrastructure 20. The road-side infrastructure 20 is mainly configured by DSRC (Dedicated Short Range Communication) arranged continuously or discretely. This DSRC provides information to the information display system 10 side using, for example, spot communication using a radio frequency of 5.8 GHz band. The DSRC is classified into a base point DSRC 21 and an information DSRC 22 when this is functionally grasped. Information provision in one service section is performed by combining the base point DSRC 21 and the information DSRC 22. Therefore, one service section is provided with one base point DSRC 21 and at least one information DSRC 22 (one example in the present embodiment). Here, the service section refers to a section set on the road where the service is provided by AHS1, but in this specification, it is included in the transmission information of the information DSRC22 from the point where the base point DSRC21 is provided. This refers to the section up to the end point of the service section (hereinafter referred to as “service end point”).
[0019]
The base point DSRC 21 is a DSRC that mainly functions as a positional reference of a service section, and provides system information and service control information as base point information. The system information includes the ID of the DSRC that transmitted the base point information and the type of whether or not this DSRC is the base point DSRC. The service control information includes an ID of information DSRC combined with the base point DSRC.
[0020]
The information DSRC 22 is a DSRC that mainly provides services, that is, provides information related to specific service contents to the vehicle side. This information DSRC 22 transmits system information, service control information, service status information, service end point information, and individual service information. The system information includes the ID of the DSRC that transmitted the information and the type of whether or not the DSRC is information DSRC. The service control information includes the ID of the base point DSRC combined with this information DSRC. The service status information includes the type of service transmitted by the information DSRC 22 and the operating / non-operating status of the service. The service end point information includes the service end point. Further, the individual service information includes information necessary for each service, that is, information related to an event to be serviced (for example, a point where an event exists, an event content, an information target section position, etc.). Here, the information target section refers to a section in which the road-side infrastructure 20 detects information related to the event, and is basically a section from the start point of the event to the end point of the event. For example, in “curve approach danger prevention support” which is one of the services, the event is a curve on the road, and in this case, the information target section is a section from the curve start point to the curve end point.
[0021]
In the present specification, the information transmitted from the information DSRC 22 is referred to as service information for the sake of convenience, judging from its nature. However, from the viewpoint of realizing this service, the starting point information transmitted from the base point DSRC 21 side can be included in the service information in a broad sense.
[0022]
Information provided from the base point DSRC 21 and the information DSRC 22 to the road-side infrastructure 10 is centrally managed by base stations (not shown) provided on the DSRC 21 and 22 side. In this base station, an event (or an information target section including this event) existing in the service section is monitored, and service information is created / updated. For this reason, the service information transmitted via the information DSRC 22 reflects information according to the traffic situation of the current service section. In the present specification, for convenience of explanation, a case where one service exists in one service section will be described.
[0023]
With reference to FIG. 1 again, the information display system 10 which is an in-vehicle system will be described. The information display system 10 includes a communication device 11, a computer 14, and a display device 16. Based on the received service information, the information display system 10 corresponds to service information for a passenger (typically a driver) of the vehicle C. Display information.
[0024]
The communication device 11 is mainly configured by an antenna 12 and a wireless device 13 and performs wireless communication with a base point DSRC 21 (or information DSRC 22). The antenna 12 that receives radio waves of a predetermined frequency transmitted from the DSRCs 21 and 22 is provided on, for example, a dashboard (instrument panel). Base point information (or service information) received by the antenna 12 is output to the wireless device 13. The wireless device 13 extracts base point information (or service information) from the carrier wave using a known demodulation method. Then, the extracted base point information (or service information) is output to the computer 14.
[0025]
The computer 14 is, for example, a microcomputer, and is configured mainly with a CPU, a ROM, a RAM, an input / output interface, and the like. The computer 14 determines information to be displayed to the driver (hereinafter referred to as “display information”) based on the service information acquired from the communication device 11. Then, the computer 14 controls the display device 16 so that the display information is displayed on a display screen (not shown). In this embodiment, since symbols are used as display information, symbol data (for example, bitmap data) that is candidates for the display information is stored in advance at a predetermined address in the ROM.
[0026]
FIG. 3 is a diagram illustrating an example of symbols. As one of the features of this embodiment, the ROM of the computer 14 stores a single symbol So as shown in FIG. When the computer 14 obtains service information, the symbol determined as display information is this single symbol So. The symbol So shown in the figure is determined in advance so as to include a plurality of pieces of service information that can be acquired from the road-side infrastructure 10, and has a design that prompts attention.
[0027]
Furthermore, vehicle information related to the vehicle C including the vehicle speed obtained from the vehicle state sensor 15 including the vehicle speed sensor, the blinker blinking state, and the like is input to the computer 14 via the input / output interface. This vehicle information is used for recognizing the position of the vehicle C in the service section based on the position of the base point DSRC 21 and recognizing the course change of the vehicle C. In addition to the vehicle information, the information input to the computer 14 may be, for example, a traveling state in front detected by a sensor including a stereo camera, a laser radar, and the like. In this case, in addition to the service information received from the road-side infrastructure 20, the computer 14 may further display the symbol So according to the traveling state ahead.
[0028]
The display device 16 is provided in a part of the instrument panel, for example, and is controlled by the computer 14 to display the symbol So on the display screen. By displaying the symbol So on the display device 16, information corresponding to the service information for the driver is provided.
[0029]
Next, a procedure for displaying information according to the first embodiment will be described. FIG. 4 is a flowchart showing the information display procedure according to the first embodiment. The processing shown in this flowchart is called every predetermined time (for example, 100 msec) and executed by the computer 14. First, in step 1, it is determined whether service information has been acquired. If the service information has not been acquired, a negative determination is made in step 1, and steps 2 and 3 are skipped and the routine is exited. Therefore, as long as service information is not acquired, the negative determination is continued in step 1, so that the display process in the subsequent step 3 is also skipped. On the other hand, when the communication apparatus 11 receives the service information and the computer 14 acquires the information, the determination result of Step 1 is switched from negative to affirmative, and thus the process proceeds to Step 2. In order for the determination result in step 1 to switch from negative to affirmative, the vehicle C is required to pass through the base point DSRC21 and the information DSRC22 paired with the base point DSRC21.
[0030]
Specifically, first, when the vehicle C passes through a radio zone (not shown) formed by the base point DSRC 21, base point information transmitted from the base point DSRC 21 is received via the antenna 12. The received base point information is output via the wireless device 13 and acquired by the computer 14. In this case, the computer 14 recognizes that the acquired information is transmission information from the base point DSRC 21 based on the acquired base point information (more precisely, system information and service control information), and sets the ID of the base point DSRC 21. recognize.
[0031]
When the vehicle C travels through the service section and passes through a wireless zone (not shown) formed by the information DSRC 22, service information transmitted from the information DSRC 22 is received via the antenna 12. The received service information is output via the wireless device 13 and acquired by the computer 14. The computer 14 specifies the starting point DSRC 21 combined with the currently passed information DSRC 22 based on the ID of the base point DSRC 21 included in the acquired service information (more precisely, service control information). Then, when the combination of the origin DSRC21 that has passed first and the information DSRC22 that has currently passed is confirmed, it is determined that the service information in the service section currently being traveled has been acquired. At the same time, the computer 14 obtains the relative positional relationship between the specified base point DSRC21 and the vehicle C (that is, the distance from the base point DSRC21 to the vehicle C) based on the vehicle speed that is one of the vehicle information. The position of this base point DSRC21 is specified. Then, the computer 14 recognizes the position of the base point DSRC 21 as a distance base point (base point position) in the service section. Therefore, thereafter, the absolute position in the service section is calculated with reference to this base point position. The computer 14 further acquires individual service information as the service information is received. For example, if the service information is “curve approach risk prevention support”, the position of the information target section (that is, the start point of the curve and the end point of the curve), the curvature of the curve, and the like are acquired as the individual service information.
[0032]
In step 2, it is determined whether information display is necessary based on the vehicle information and the service information. The reason for making such a determination is to provide information only to an appropriate driver existing in the service section. This is because, in view of the AHS1 system concept that malicious runaway driving is not subject to service, vehicles C that greatly exceed the average traveling speed are excluded from information display targets. Even if the information DSRC 22 is passed, if the vehicle C deviates from the service section due to a subsequent course change, even if information is displayed, it may become meaningless. Therefore, in order to avoid the information display in such a situation, the determination in step 2 is provided prior to the display process in step 3. The overspeed or the course change that is determined not to require information display can be specified based on the vehicle information including the vehicle speed and the blinker blinking state, and the service information. When an affirmative determination is made in step 2 (when information display is necessary), the process proceeds to step 3 that follows. On the other hand, if a negative determination is made in step 2 (when there is no need for information display), step 3 is skipped and the routine is exited.
[0033]
In step 3, the display device 16 is controlled to display the display information. In this case, the computer 14 determines a single symbol So stored in the ROM as display information. Therefore, no matter what kind of service the road side infrastructure 20 provides service information, as long as the processing in step 3 is performed, the symbol So in FIG. When the display device 16 is controlled in step 3, the process proceeds to return, and the execution of this routine in the current cycle is terminated.
[0034]
As long as the vehicle C is passing through the service section, the series of steps 1 to 3 are repeated. Note that the computer 14 determines that the end point of the event is a display end point at which the display of the symbol So is ended, synchronizes the arrival of the vehicle C at the display end point and the timing, and ends the display of the symbol So. To do. When new service information is acquired, an affirmative determination is made in the process of step 1, the process described above is performed, and a single symbol So is displayed again.
[0035]
Thus, according to the present embodiment, when service information is received on the information display system 10 side, a single symbol So as shown in FIG. 3 is displayed. Therefore, although information related to the service target event is acquired as service information, the information is basically not displayed on the display device 16. The purpose of AHS1 is to increase traffic safety by cooperating between road vehicles, and the purpose of providing the information is to call attention for prompting a driving operation for avoiding danger such as a brake operation. Therefore, even if service information related to any type of service is received from the road-side infrastructure 20, an action performed by a driver who understands the service information is a driving operation for avoiding danger in principle. Therefore, if the driver recognizes in advance that the symbol So as shown in FIG. 3 prompts attention, the user can simply display the symbol So without displaying the detailed information. Can call attention. In addition, if the driver predicts the danger in response to this alert, the driver can quickly perform a driving operation for avoiding the danger while confirming the traveling state ahead.
[0036]
When detailed information about events is displayed, drivers who are unfamiliar with driving often find it difficult to achieve both driving operation and recognition of display information, and it may take time to recognize display information. . In this regard, in the present embodiment, since a single symbol So is displayed, the degree of gaze at the display screen by the driver can be reduced. Thereby, it can be recognized in a short time that the driving | operation operation for danger avoidance is requested | required. Therefore, a driving operation for avoiding danger can be effectively urged even for a driver who is unfamiliar with driving. Naturally, the effect of the present embodiment is not limited to a driver unfamiliar with driving, but the same effect can be achieved even with a driver skilled in driving. Therefore, since the delay from the understanding of the symbol So to the driving operation can be reduced, the safety can be improved.
[0037]
Note that the single symbol So stored in the ROM is not limited to the design shown in FIG. 3, and various designs that can alert the driver can be adopted. For example, a pattern “x” may be displayed on the display device 16 as the symbol So, or a character such as “caution” may be displayed as the symbol So. However, even a single symbol So that can call attention may be time-consuming to understand if a complicated pattern or character is used, so the design is simplified to a level that is excellent in visibility. It is preferable.
[0038]
In AHS1, basically, a service is performed for an event that requires a driving operation such as stop or deceleration. Therefore, instead of the symbol So shown in FIG. 3, for example, a symbol So ′ that makes a driver aware of a driving operation such as stop or deceleration can be used. FIG. 5 is a diagram illustrating another example of the symbol So. In the example shown in the figure, a design reminiscent of a deceleration operation (actuation of the brake) is used for the symbol So ′ ((a) in the figure). In addition, a character such as “brake” may be used as the symbol So ′ ((b) in the figure). Since the symbol So ′ has a one-to-one correspondence between the symbol and the driving operation, the driving operation for avoiding danger can be effectively urged to the driver.
[0039]
In the present embodiment, the brake operation is described as the driving operation requested by the service operated as the AHS 1. However, even if a service requesting other driving operation such as steering or acceleration is performed as the service, or even if it is established as a different driving support system, by displaying the single symbol So shown in FIG. The driver can be alerted. For this reason, even if the requested driving operation is different, the driving operation for avoiding danger can be predicted.
[0040]
However, when a single symbol So ′ as shown in FIG. 5 is displayed, a situation may occur in which the symbol does not correspond to the driving operation, which may cause confusion. Therefore, as a technique for avoiding such a situation, a reference map that describes the correspondence between a plurality of service information that can be received from the road-side infrastructure and symbols to be displayed corresponding to each service information is created. It is possible to keep it. As a premise for creating this reference map, the creator of the reference map classifies a plurality of service information that can be received from the road-side infrastructure so that the same driving operation that prompts the driver belongs to the same group. Keep it. Then, for each classified group, a single symbol including a plurality of service information belonging to the group (for example, a symbol with a design reminiscent of a driving operation) is associated.
[0041]
When such a reference map is used, when the communication apparatus 11 receives service information, the computer 14 specifies a symbol corresponding to the received service information based on the reference map. That is, the computer 14 specifies a single symbol associated with this group by specifying a group on the reference map based on the received service information. Thus, the computer 14 determines the specified single symbol as display information, and controls the display device 16 to display the determined symbol. In other words, when the communication device 11 receives the service information, the computer 12 controls the display device 16 so as to display a single symbol intended for the operation action urged by the service information. Thus, by making display information correspond to the driving operation to be taken by the driver, it is possible to easily understand the required driving operation as well as alerting the driver. Even in such a case, although it is for each driving operation, a single symbol is displayed, and thus the same effect as in the above embodiment can be obtained.
[0042]
(Second Embodiment)
As in the first embodiment, this embodiment displays a single symbol So regardless of the type of service information. However, when only a single symbol So is displayed, the service information is more specific. Can be selectively switched. In this case, the computer 14 has a first control mode for displaying only a single symbol So (hereinafter simply referred to as “simple mode”) and a second control mode for displaying service information more specifically ( Hereinafter, it is simply referred to as “detail mode”. In the simple mode, when service information is received, the display device 16 is controlled to display a single symbol So regardless of the type of service information, as in the first embodiment. On the other hand, in the detailed mode, when service information is received, the display device 16 displays a symbol that embodies the service information based on the service information, that is, a symbol that shows in detail the event that is the target of the service. Is controlled. These control modes can be switched by a driver by using a switch (not shown) connected to the computer 14.
[0043]
Further, in the ROM of the computer 14, in addition to the data of the single symbol So, further, data (for example, graphic data embodying an event) of symbols (hereinafter referred to as “detailed symbols”) that embody service information. And character data). When the service operated as the AHS 1 is of the type described above, basically six patterns of detailed symbols are stored in the ROM. However, since various situations are assumed for the event to be serviced, it is preferable that these detailed symbols have various variations even when attention is paid to one service. For example, in the case of “road surface information provision support” which is one of the services, a plurality of variations such as road surface freezing, a low friction coefficient road, road surface water wetting, and snow accumulation are provided as events. The computer 14 may appropriately create detailed symbols (particularly text data) based on the service information so as to provide optimum information regarding the event, or the service information as it is to be displayed. You may decide.
[0044]
FIG. 6 is a flowchart showing a display procedure according to the second embodiment. The processing shown in this flowchart is also called every predetermined time (for example, 100 msec) and executed by the computer 14. First, in steps 10 and 11, as in steps 1 and 2 of FIG. 4, it is determined whether or not service information has been acquired and whether or not information display is necessary. If a negative determination is made in either step 10 or step 11, steps 12 and 13 (or steps 12 and 14) described later are skipped and the routine is exited. On the other hand, if an affirmative determination is made in steps 10 and 11, the process proceeds to step 12 following step 11.
[0045]
In step 12, it is determined whether or not the current control mode is the simple mode. If the driver has set the switch to the simple mode, an affirmative determination is made in step 12 and the process proceeds to step 13. In step 13, as in step 3 shown in FIG. 4, the display device 16 is controlled so that a single symbol So is displayed. When the display device 16 is controlled in step 12, the process proceeds to return, and the execution of this routine in the current cycle is terminated.
[0046]
On the other hand, if the switch is set to the detailed mode, a negative determination is made in step 13, and the process proceeds to step 14. In this case, the computer 14 determines, as display information, a detailed symbol corresponding to the received service information among the detailed symbols stored in the ROM. For example, when the received service information is “curve approach danger prevention support”, as a detailed symbol, a graphic symbol in which a road curve is designed and road curve information (turning radius, approach speed, etc.) are shown. It seems to use character symbols. When the display device 16 is controlled in step 14, the process proceeds to return, and the execution of this routine in the current cycle is terminated.
[0047]
As long as the vehicle C is passing through the service section, a series of procedures is repeated. The computer 14 determines that the end point of the event is a display end point at which the display of the symbol So (or detailed symbol) ends, and synchronizes the passage of the vehicle C at the display end point with the timing, The display of So (or detailed symbol) is terminated.
[0048]
Thus, according to this embodiment, since the driver can arbitrarily switch the display form, the display form corresponding to the driving level can be selected. For example, if it is a driving beginner, by selecting the simple mode, it is possible to select a display form with better visibility than the specific contents of the service information. Thereby, there can exist an effect similar to 1st Embodiment mentioned above. On the other hand, if it is an experienced driver | operator, driving operation can be performed, recognizing the specific information of service information by selecting detailed mode. Therefore, in the second embodiment, flexible information display can be performed according to the level of the driver.
[0049]
In the second embodiment, the detailed mode and the simple mode are alternatively switched. However, the control device is initially set to the simple mode, and when the driver desires (for example, by performing some operation), the display device 16 displays a detailed symbol corresponding to the received service information at any time. May be controlled. In this case, detailed information can be confirmed in a state where the driver himself has plenty of driving conditions.
[0050]
In the second embodiment, the driver arbitrarily switches the control mode. However, the computer 14 may switch the control mode. As an example of such a method, the simple mode is selected until an event related to service information is passed, and after passing this event, only for a predetermined time (or until an operation for terminating display is performed by a driver operation) ) The detailed symbols are continuously displayed in the detailed mode. In this case, since the simple mode is selected in a situation where a driving operation until passing the event is required, the avoidance operation can be performed according to the alert as described above. Further, if the mode is switched to the detailed mode after the event has passed, the specific situation can be confirmed in a state where there is a margin in the driving situation.
[0051]
In this specification, the term “until the event is passed” is not only used in a situation where the vehicle has completely passed the event, but the event can be safely passed even if the event is passing. This is used if the situation is judged to be. Therefore, in the latter situation, the computer 14 may switch from the simple mode to the detailed mode. The determination of whether or not the event can be safely passed can be made based on the traveling state before the event is passed. For example, if the target speed of a curve that exists as an event is designed at 40 km / h in the “curve entry risk prevention support”, it is determined that the curve can be safely passed if it is below this speed. For example, the simple mode is switched to the detailed mode.
[0052]
Although not described in detail in the first embodiment or the second embodiment, the information display system 10 sounds a specific sound or a specific warning sound by using, for example, a speaker (not shown). Therefore, it is possible to call attention using both display and sound.
[0053]
【The invention's effect】
According to the present invention, when service information is received on the information display system side, a single symbol is displayed. If the driver recognizes that the displayed single symbol prompts attention, it is possible to prompt attention only by displaying this single symbol without displaying detailed information about the service information. be able to. For this reason, if the driver predicts danger by receiving this warning, driving operation for avoiding danger can be promptly performed while confirming the traveling state ahead. In addition, according to the present invention, since it is not necessary to pay attention to the display screen, the degree of gaze on the display screen by the driver can be reduced. Thereby, it can be recognized in a short time that the driving | operation operation for danger avoidance is requested | required. Therefore, it is possible to effectively prompt the driver to perform a driving operation for avoiding danger. Further, since the delay from the understanding of the symbol to the driving operation can be reduced, traffic safety can be achieved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the overall configuration of a driving support system to which an information display system according to an embodiment is applied.
FIG. 2 is an explanatory diagram showing the road side infrastructure.
FIG. 3 is a diagram showing an example of a symbol
FIG. 4 is a flowchart showing a display procedure of information according to the first embodiment.
FIG. 5 is a diagram showing another example of symbols
FIG. 6 is a flowchart showing a display procedure according to the second embodiment. This flowchart
[Explanation of symbols]
1 AHS
10 Information display system
11 Communication device
12 Antenna
13 radio
14 Computer
15 Vehicle status sensor
16 Display device
20 Road side infrastructure
21 Base point DSRC
22 Information DSRC

Claims (1)

In the service section set on the road, the information display system that receives information on the event subject to service from the road side infrastructure as service information, and displays information according to the received service information,
A communication device for receiving service information transmitted from the road side infrastructure;
A computer for determining a symbol to be displayed based on the received service information;
A display device controlled by the computer and displaying the determined symbol;
The computer has a first control mode and a second control mode as control modes for controlling the display device,
When the communication apparatus receives the service information, the computer displays the single symbol including a plurality of service information that can be received from the road-side infrastructure in the first control mode. And controlling the display device to display a symbol embodying the received service information rather than the single symbol in the second control mode.
The computer selects the first control mode until an event related to the service information passes, and selects the second control mode after passing an event related to the service information. .

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