Patent Publication Number: US-2022221869-A1

Title: Information display system and information display method

Description:
TECHNICAL FIELD 
     The present invention relates to an information display system and an information display method. 
     The present application claims priority based on Japanese Patent Application No. 2019-077616 filed in Japan on Apr. 16, 2019, the contents of which are incorporated herein by reference. 
     BACKGROUND ART 
     The technology of autonomous vehicles and autonomous driving robots (hereinafter referred to as autonomous vehicles) has advanced, and these autonomous vehicles have begun to be introduced in various places in block buildings, showing signs of widespread use. These autonomous vehicles are expected to travel in a state where pedestrian vehicles coexist, such as in buildings, underground passages, on sidewalks, and on roads with non-separated pedestrian vehicles. Under such circumstances, technology and interaction are required to drive smoothly even in a crowded status with a large number of people. For example, in the past, a driver has been driving while alerting a pedestrian by a horn in an automobile, a bell in a bicycle, an alert sound in an airport cart, or the like. 
     In addition, since a human driver who communicates with a pedestrian is not on board an autonomous vehicle, research is being conducted on a technology for communicating between the vehicle and the pedestrian using an information interface. For example, a technique has been proposed in which images of characters and facial expressions are displayed by mounting a display on a vehicle body surface of an autonomous vehicle, or by irradiating a road surface with light from a projector provided in an autonomous vehicle. 
     Further, for example, Patent Document 1 and Patent Document 2 describe systems capable of displaying information on the floor, in particular, systems in which a projector is installed at an elevator landing to display guidance information on a wall, a door, a floor, or the like. 
     PRIOR ART DOCUMENT 
     Patent Document 
     
         
         [Patent Document 1] 
       
    
     Japanese Unexamined Patent Application, First Publication No. 2018-70377
     [Patent Document 2]   

     PCT International Publication No. WO 2018/078681 
     SUMMARY OF INVENTION 
     Problems to be Solved by the Invention 
     However, when calling attention using sounds such as horns, in an environment where autonomous vehicles are widespread, many autonomous vehicles will travel while generating alert sounds, which are ineffective and causing noisy environment that is not preferable in the city. 
     In addition, in the method of displaying information on the road surface by the projector of the autonomous vehicle, the main thing is to inform people of the state of autonomous vehicles and to communicate between road crossers and vehicles, and it does not encourage coordination between pedestrians in a crowded environment. In addition, each autonomous vehicle needs to have a function of displaying information on the road surface. 
     Further, Patent Documents 1 and 2 are used at the elevator platform, not in the space where the pedestrian vehicle exists. 
     The present invention has been made in view of such circumstances, and an object of the present invention is to provide an information display system and an information display method capable of promoting cooperation between pedestrians and vehicles while reducing the amount of generated noise. 
     Means for Solving the Problems 
     In order to solve the above-mentioned problems, one aspect of the present invention is an information display system that includes: a status determination unit that acquires a distribution status based on a detection result of a position of an object to be avoided in a target area; a route generation unit that generates a scheduled route on which a vehicle can travel based on the detected distribution status; and a floor display device that displays the scheduled route on a floor of the target area. 
     Further, one aspect of the present invention is an information display method that includes: acquiring, by a status determination unit, a distribution status based on a detection result of a position of an object to be avoided in a target area; generating, by a route generation unit, a scheduled route on which a vehicle can travel based on the detected distribution status; and displaying, by a floor display device, the scheduled route on a floor of the target area. 
     Advantageous Effects of the Invention 
     As described above, according to the present invention, it is possible to promote cooperation between an autonomous vehicle and a person while suppressing influence on the noisy environment. Further, even if the autonomous vehicle is not equipped with a function of displaying information on the road surface by a projector, it is possible to promote cooperation between the autonomous vehicle and a person by using the information displayed on the road surface. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1A  is a conceptual diagram of a space in which the information display system  1  is used as viewed from the horizontal direction. 
         FIG. 1B  is a conceptual diagram showing a bird&#39;s-eye view of the space in which the information display system  1  is used. 
         FIG. 2  is a flowchart showing the operation of the information display system  1 . 
         FIG. 3  is a conceptual diagram showing a status of a target area  100 . 
         FIG. 4  is a conceptual diagram showing a status of a target area  100 . 
         FIG. 5  is a conceptual diagram showing a status of a target area  100 . 
         FIG. 6  is a conceptual diagram showing a status of a target area  100 . 
         FIG. 7  is a diagram showing an example of a display mode of the floor display device  40 . 
     
    
    
     EMBODIMENTS FOR CARRYING OUT THE INVENTION 
     Hereinafter, the information display system according to the embodiment of the present invention will be described with reference to the drawings. 
       FIGS. 1A and 1B  are diagrams showing a configuration of an information display system according to an embodiment of the present invention.  FIG. 1A  is a conceptual diagram of the status of the space in which the information display system  1  is used as viewed from the horizontal direction.  FIG. 1B  is a conceptual diagram showing a bird&#39;s-eye view of the space in which the information display system  1  is used. 
     The information display system  1  includes a plurality of sensors  10 , a congestion status determination device  20 , a route generation device  30 , a floor display device  40 , an autonomous vehicle  50 , and a network  60 . 
     The sensor  10  detects structures such as walls, floors, and poles in the target area  100  and detects the movement of a group (or person), an autonomous vehicle  50 , or the like, thereby detecting the position of the group or the autonomous vehicle  50  in the target area  100 . For example, the sensor  10  can use a camera that captures the target area from above or a 3D scanner, and can be installed on the ceiling or wall of the target area  100 . 
     Here, the target area  100  may be arranged so that the target area  100  can be detected as a whole by a plurality of sensors  10 , such as the sensor  10   a,  the sensor  10   b,  and the sensor  10   c.  Hereinafter, when the sensor  10   a,  the sensor  10   b,  and the sensor  10   c  are not particularly identified, they are simply referred to as the sensor  10 . 
     The target area  100  is an area to be monitored when displaying various signals by the floor display device  40 , and is, for example, an underground pedestrian space, a building, a sidewalk, a road in which pedestrians are not separated, and the like. 
     In the target area  100 , there are a plurality of poles  110  (here, poles  110   a  and  110   b ). Such a pole  110  is provided between the floor and the ceiling surface. 
     Further, a person or an autonomous vehicle  50  can pass through the target area  100 . In this figure, as an example, the case where the group  120   a,  the group  120   b,  and the group  120   c,  which are a group of passersby, is passing is illustrated. 
     The congestion status determination device  20  acquires the distribution status based on the result of detecting the position of the object to be avoided existing in the target area  100 . The congestion status determination device  20  grasps the distribution of congestion of people, goods, and vehicles in the entire space in real time by associating the information obtained from the sensor  10  with the floor map. The object to be avoided referred to here is an object that does not interfere with the autonomous vehicle  50  when traveling, and is, for example, a person, an obstacle (for example, a wall, a pole, a door, temporarily or permanently placed furniture, luggage, etc.), autonomous vehicles (other autonomous vehicles), etc. The floor map is information showing the structure of the floor which is the target area  100 , and is map information showing the positions of walls and poles, the entrances and exits of the target area  100 , and the positions of the entrances and exits of shops. The congestion status determination device  20  maps the positions of the group and the autonomous vehicle  50  detected by the sensor  10  to the floor map, so that it is specified at which position in the target area  100  the group or the autonomous vehicle  50  exists. 
     The route generation device  30  generates a scheduled route on which the vehicle can travel based on the detected distribution status. 
     In a case where there are a plurality of vehicles in the target area, the route generation device  30  determines whether or not the vehicles interfere with each other when the vehicles move along the scheduled route of each vehicle. When there is an interference, the route generation device  30  determines a route that does not interfere. When there is an interference, the route generation device  30  generates a wait time for any vehicle that is interfering. When the degree of change in the congestion status is more than a certain level, the route generation device  30  regenerates the scheduled route so as to avoid the congested area. When the congestion status determination device  20  detects that a person has entered the scheduled route, the route generation device  30  makes the floor display device  40  display a warning. When the congestion status determination device  20  detects that the person does not exit from the scheduled route when the person enters the scheduled route, the route generation device  30  regenerates the scheduled route. The route generation device  30  notifies the vehicle of the generated scheduled route. 
     The route generation device  30  determines a gap through which the autonomous vehicle can pass between a group of people or objects based on the distribution status by the congestion status determination device  20 , determines a scheduled route through which the autonomous vehicle  50  can pass based on the gap, and displays a signal on the floor. 
     In  FIG. 3 , the target area  100  has an area  102  between the wall  101   a  and the wall  101   b  through which a person or an autonomous vehicle  50  can pass. On the side of the wall  101   a  opposite to the area  102 , there is a shop  103   a  where people can enter and exit, and on the side of the wall  101   b  opposite to the area  102 , there is an entrance  104   b  where people can enter and exit the area  102 . The area  102  includes poles  110   c,    110   d,    110   e,    110   f,    110   g,  and  110   h.  Further, in this figure, a plurality of groups of one or a plurality of people are shown (for example, a group of  120   d ), and a plurality of autonomous vehicles  50   a,    50   b,  and  50   c  are shown. The arrows in the vicinity of each person and the autonomous vehicle indicate the direction of travel, and the length of the arrow indicates the moving speed. The longer the length, the faster the moving speed. 
     Here, the scheduled route  130   a  is displayed for the autonomous vehicle  50   a,  the scheduled route  130   b  is displayed for the autonomous vehicle  50   b,  and the scheduled route  130   c  is displayed for the autonomous vehicle  50   c.    
     In this way, in a space that has a specific spread and is expected to be congested (for example, an underground pedestrian space), even when pedestrians are mixed, by having the information display function in the space itself (floor) and linking the information display function with the autonomous vehicle, it is possible to provide a signal display system for promoting smooth movement between an autonomous vehicle and a plurality of pedestrians. 
     In addition, by using the floor display function, it is possible to separate pedestrians according to the congestion status, and it is possible to alert pedestrians. 
     Returning to  FIG. 2 , the route generation device  30  can also estimate the change in the congestion distribution after t seconds based on the moving direction and speed of a person or an object, and generate a scheduled route according to the estimation result. 
     Further, the route generation device  30  feeds back the scheduled route to the autonomous vehicle. By detecting the congestion status of the target area  100  by the sensor  10  and transmitting the planned travel route from the route generation device  30  to the autonomous vehicle  50  based on the congestion status, the congestion status determination device  20 , the route generation device  30 , and the autonomous vehicle  50  can always share information with each other. When a status change occurs in the target area  100 , the autonomous vehicle  50  controls the operation based on the change, and the route generation device  30  changes the display of the floor surface display device  40 . The autonomous vehicle  50  preferentially moves on the scheduled route set by the route generation device  30  unless a large change in the status occurs. 
     The floor display device  40  has an information display function in which the floor functions as a display, and by displaying the scheduled route of the autonomous vehicle  50  on the floor corresponding to the current position of the autonomous vehicle  50  in the target area  100 , dynamic pedestrian separation can be performed in real time. In a case where the congestion status determination device  20  detects that a person has entered the scheduled route, when the route generation device  30  detects that the displayed rule has been violated, the floor display device  40  displays a warning at a position on the floor (for example, a foot portion) corresponding to the current position of a person who has entered the scheduled route. 
     As the floor display device  40 , for example, a floor display device on which a vehicle can be placed or traveled on the floor can be applied. The display may be a liquid crystal display, a plasma display, an organic EL display, or the like. 
     By displaying the scheduled route on the floor, surrounding pedestrians can recognize the display as a signal. 
     The autonomous vehicle  50  has a sensor that measures the direction of an obstacle and the distance to the obstacle around itself, and travels while grasping the surrounding status that it has grasped. Further, the autonomous vehicle  50  transmits its own control information to the congestion status determination device  20  in real time via the network  60 . Not that the autonomous vehicle  50  updates/changes the planned traveling route at any time only by the information obtained by the sensor of the own vehicle. Instead, by coordinating the congestion status determination device  20  with the autonomous vehicle  50 , the route generation device  30  determines the route considered to be the most efficient in the entire space (target area  100 ). The autonomous vehicle  50  travels based on a scheduled route obtained from the route generation device  30 . 
     Although only one autonomous vehicle  50  is shown in this figure, a plurality of autonomous vehicles  50  may exist in the target area  100 . 
     The network  60  is an information network that is communicably connected between the sensor  10 , the congestion status determination device  20 , the route generation device  30 , the autonomous vehicle  50 , and the like. 
     Next, the operation of the above-mentioned information display system  1  will be described with reference to  FIGS. 2 to 6 .  FIG. 2  is a flowchart for explaining the operation of the information display system  1 , and  FIGS. 3 to 6  are conceptual diagrams showing the status of the target area  100 . 
     The sensor  10  recognizes a person, an object, an autonomous vehicle  50 , or the like in the target area  100  (step S 100 ). 
     The congestion status determination device  20  generates data indicating the distribution status in which the recognition result obtained from the sensor  10  is associated with the floor map, and detects the congestion status representing the congestion distribution in the entire target area  100  (step S 101 ). 
     The route generation device  30  generates a scheduled route for the autonomous vehicle  50  based on the generated distribution state (step S 102 ). Here, when a plurality of autonomous vehicles  50  exist in the target area  100 , a scheduled route is generated for each of them. 
     Next, the route generation device  30  targets the scheduled route assigned to one autonomous vehicle n out of one or a plurality of autonomous vehicles  50  and sets the scheduled route for a certain distance from the current position with the others (step S 103 ). 
     When multiple scheduled routes overlap (interfere with other scheduled routes) or other scheduled routes are within a certain distance based on the planned route of the autonomous vehicle n, the route generation device  30  obtains the arrival time of each autonomous vehicle  50  to the section (step S 104 ). 
     Then, the route generation device  30  determines whether or not the obtained arrival times collide with each other (step S 105 ). 
     The route generation device  30  holds the information by storing it as another scheduled route if the requested arrival time does not collide (step S 106 ). 
     On the other hand, when the obtained arrival times collide, the route generation device  30  determines whether or not the scheduled routes colliding with the arrival times are oriented in the same direction (step S 107 ). When facing the same direction, the route generation unit  30  overlaps the two scheduled routes (step S 108 ). For example, when the traveling direction of the other autonomous vehicle  50  is included in a certain range of the traveling direction of the one autonomous vehicle  50 , a scheduled route is generated so that the other autonomous vehicle  50  follows the one autonomous vehicle  50 . As a result, the autonomous vehicle  50  can travel without colliding with the autonomous vehicle  50 . The route generation device  30  then generates different scheduled routes for one autonomous vehicle  50  and the other autonomous vehicle  50  according to the destination. 
     On the other hand, when the route generation device  30  does not face the same direction, a waiting period (a period for pausing or decelerating) is provided for one of the scheduled routes (step S 109 ). As a result, it is possible to prevent the autonomous vehicle  50  from colliding with the vehicle. 
     The route generation device  30  transmits data indicating the scheduled route to the floor display device  40  in the target area  100  based on the generated scheduled route. Here, since the current position of each autonomous vehicle  50  can be detected by the sensor  10 , image data for displaying the scheduled route based on the current position on the floor display device  40  may be transmitted. Further, the route generation device  30  transmits the generated scheduled route to the generated target autonomous vehicle  50  via the network  60  (step S 110 ). The floor display device  40  displays the scheduled route on the floor according to the data indicating the scheduled route received from the route generation device  30 . Here, the scheduled route within a certain distance range from the current position of the autonomous vehicle  50  to the traveling direction is displayed according to the current position of the autonomous vehicle  50 . 
     Next, the route generation device  30  acquires the distribution status based on the recognition result of the sensor  10  after the wait time of x seconds has elapsed (step S 111 ), acquires the distribution status based on the recognition result of the sensor  10 , and determines whether or not all the autonomous vehicles  50  have exited from the target area  100  (step S 112 ). If it is determined that all the autonomous vehicles  50  have exited, the route generation device  30  ends the process. 
     On the other hand, if it is determined that all the autonomous vehicles  50  have not exited, the route generation device  30  determines whether or not a person has entered the scheduled route (step S 113 ). The route generation device  30  causes the floor display device  40  to display a warning when a person is entering the scheduled route based on the status distribution according to the recognition result obtained from the sensor  10  (step S 114 ). For example, a message such as “The vehicle is about to pass. Please be careful,” is displayed on the floor by the floor display device  40  around the person who is detected to be in the area. By seeing this message, a person who has entered the scheduled route can move out of the displayed scheduled route by recognizing that the autonomous vehicle  50  is in the area where the vehicle is scheduled to pass. 
     The route generation device  30  determines whether or not a person who has entered the scheduled route has exited (step S 115 ). If the person does not exit, the route that bypasses the person is regenerated as a scheduled route (step S 118 ), and then the process proceeds to step S 103 . 
     On the other hand, when the person who has entered the scheduled route exits, the route generation device  30  determines whether or not there has been a sudden change in the distribution status on the scheduled route (step S 116 ). For example, when a large number of people suddenly enter the target area  100 , or when the moving speed of the people in the target area  100  suddenly increases (for example, when they start running), there are cases where the traveling direction of a person in the target area  100  is significantly changed. The determination whether or not there has been a sudden change in the distribution status may be performed by, for example, comparing the distribution status at the time of determination with the distribution status before a certain time tl seconds, and based on whether or not there is a change of a certain amount or more with respect to the degree of congestion, the moving speed of a person, the moving direction, and the like. 
     The route generation device  30  regenerates the scheduled route when there is a sudden change in the distribution status (step S 118 ). Here, a scheduled route through which the autonomous vehicle  50  can pass is generated based on a gap through which the autonomous vehicle  50  can pass according to the distribution state after the change occurs. 
     On the other hand, if there is no sudden change in the distribution status, the route generation device  30  extends the scheduled route according to a travel distance (step S 117 ). For example, the route generation device  30  obtains a travel distance of the vehicle targeted to extend the scheduled route from the difference between the position measured last time by the sensor  10  and the position measured this time and extends the current scheduled route by a distance similar to the travel distance thereof. After that, the process proceeds to step S 105 . 
     When the scheduled route is displayed in step S 110  of the flowchart of  FIG. 2  described above, as shown in  FIG. 3 , the route generation device  30  determines a gap through which the autonomous vehicle  50  can pass between a group of people or objects based on the distribution status of the congestion status determination device  20 , determines a scheduled route through which the autonomous vehicle  50  can pass based on the gap and transmits data indicating the scheduled route to the floor display device  40 . The floor display device  40  displays signals (scheduled route  130   a,  scheduled route  130   b,  scheduled route  130   c ) on the floor based on the data indicating the scheduled route received from the route generation device  30 . 
     For example, when a reference distance is the distance in the width direction in which the autonomous vehicle  50  can travel with a margin and moving objects are separated by this reference distance (a gap of about one person or several persons), the determination of the gap is performed by recognizing the outline of the group based on the gap and determining these to be different groups. Further, when the autonomous vehicle  50  is closer than the distance in the width direction in which the autonomous vehicle  50  can travel with a margin, those objects are included in the group (determined as one group). Here, in a case where there is a gap between objects at a narrower interval than is considered to be the boundary of the group (a gap narrower than the reference distance but within a certain difference from the reference distance), the gap can be a candidate for a scheduled route as a place where a gap may open up to the reference distance. Then, depending on the status in the target area  100 , the scheduled route that has been the candidate may be applied and set as the scheduled route of the autonomous vehicle  50 . 
     Further, in a case where the route generation device  30  generates the scheduled route so as to overlap the two scheduled routes in step S 108 , when there are multiple autonomous vehicles heading in the same direction as shown in  FIG. 4 , in order to use space efficiently and reduce the possibility of re-changing the route and the possibility of collisions, a plurality of autonomous vehicles may be formed in a platoon to unify the scheduled routes. 
     Here, the scheduled route  140   b  of the autonomous vehicle  50   b  is generated and displayed so as to follow the scheduled route  140   a  of the autonomous vehicle  50   a.  On the other hand, since the traveling directions of the autonomous vehicle  50   c  and the autonomous vehicle  50   a  are different, the scheduled route  140   c  of the autonomous vehicle  50   c  does not follow the scheduled route  140   a  and the scheduled route  140   b  of the autonomous vehicles  50   a  and  50   b,  and an independent scheduled route  140   c  is generated and displayed. 
     Further, when the congestion is overcrowded or when the timings of movement of people, objects, and vehicles overlap, by providing a temporary stop on one of the scheduled routes in step S 109 , when one of the vehicles temporarily stops as shown in  FIG. 5 , the route generation device  30  generates a scheduled route that gives way. For example, the position for pausing on the scheduled route  150   c  is any position before the autonomous vehicle  50 c reaches the scheduled route  150   a  of the autonomous vehicles  50   a  and  50   b.  Based on this scheduled route, in some cases, the floor display device  40  displays a warning (reference numeral  155   c ) in advance at an expected point where the vehicle will temporarily stop. As a result, it is possible to urge people from entering the temporarily stopped area, and the autonomous vehicle  50   c  can give way to the autonomous vehicle  50   a  and the autonomous vehicle  50   b.    
     In addition, if there is a conflict between the route on which the vehicle is scheduled to travel and the direction in which the person wants to move, the person may enter or cross the route. In such a case, in step S 114 , as shown in  FIG. 6 , the route generation device  30  displays a warning (reference numeral  161   a ) at a position where a conflict occurs in the scheduled route  160   a.  This can encourage a person to exit immediately. Further, if sufficient time is required to reach the point and an alternative route can be generated, the route generation device  30  can switch the display to the alternative route (reference numeral  162   a ). If sufficient time is not available, the status of the autonomous vehicle is judged, and stop/avoidance is controlled, and the floor display is performed based on the information. 
     In the above-described embodiment, the floor display device  40  may display the scheduled route in a different display mode depending on the scheduled time from the starting point to the passing point in the scheduled route. For example, as shown in  FIG. 7 , depending on the length of the arrival time to each passing point (reference numeral  170 , reference numeral  171 , reference numeral  172 , reference numeral  173 , and reference numeral  174 ) on the scheduled route of the autonomous vehicle  50   d,  the floor display device  40  may display colors, line types, and the like in different display modes (reference numeral  170   a,  reference numeral  171   b,  reference numeral  172   c,  reference numeral  173   d,  and reference numeral  174   e ). For example, the distance from the current position of the autonomous vehicle  50   d  to the passing point indicated by reference numeral  173  is obtained by “speed v 2  (speed of autonomous vehicle  50   d )×time t (estimated time to reach the passing point indicated by reference numeral  173  from the current position)”. Further, the distance traveled by the time t of the person  179  moving at the speed v 1  can be obtained by v 1 ×t, and from this distance and the traveling direction of the person  179 , the scheduled route of the autonomous vehicle  50   d  may be obtained so that the person  179  does not interfere with the vehicle. 
     In addition, as the distance from the current position of the autonomous vehicle  50   d  increases on the scheduled route, the possibility of changing the route due to changes in the status increases. Therefore, the degree of determination of the route may be expressed by changing the type of the line to a display mode such as a dotted line or changing the transparency of the line (reference numeral  175   a ). 
     According to the above-described embodiment, the optimum route can be performed for the autonomous vehicle and the pedestrian in consideration of the congestion status of the entire space. Further, even when the autonomous vehicle comes from behind the pedestrian, the floor display function can be used to display a warning for notifying the presence of the vehicle to the area in the traveling direction of the pedestrian. As a result, even if there is an autonomous vehicle  50  that should be noted when it is not in the pedestrian&#39;s field of view, a warning can be displayed within the range of the pedestrian&#39;s field of view by using the floor display function. 
     In the above-described embodiment, in a case where a route is generated in the initial step (for example, step S 102 ), when people are overcrowded in the traveling direction of the autonomous vehicle  50  (for example, a group is fully lined up from the wall  101   a  to the wall  101   b ) and no gap can be found, the route generation device  30  may generate a route assuming a location where the gap may open. For example, when the traveling directions of the autonomous vehicle  50  and the group are the same, the autonomous vehicle  50  follows behind the group, and for the feet of the group which are on the front side of the autonomous vehicle  50  in the traveling direction, a warning display may be made to warn that the autonomous vehicle  50  is approaching from behind. As a result, some people in the group who visually recognize the warning display make a gap, so that the autonomous vehicle  50  can set the gap as the scheduled route and proceed to the front side of the group. Further, when the traveling direction of the autonomous vehicle  50  and the group are opposite to each other or the group is staying, as described above, a temporary stop or a warning display is performed to urge the vehicle to make a clear route. As a result, some people in the group who visually recognize the warning display make a gap, so that the autonomous vehicle  50  can set the gap as the scheduled route and proceed while avoiding the group. 
     In the above-described embodiment, the case where the floor display device uses a display has been described, but various information such as a scheduled route and warning information may be projected on the floor by using a projector or the like installed above the floor. 
     The congestion status determination device  20  or the route generation device  30  in the above-described embodiment may be realized by a computer. In that case, the program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed. The term “computer system” as used herein includes hardware such as an OS and peripheral devices. Further, the “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, or a storage device such as a hard disk built in a computer system. Further, a “computer-readable recording medium” may also include those that dynamically hold programs for a short period of time, like a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line, and those that hold the program for a certain period of time, like the volatile memory inside a computer system that serves as a server or client in that case. Further, the above program may be for realizing a part of the above-mentioned functions. Furthermore, the above-mentioned functions may be realized in combination with a program already recorded in the computer system, and may be realized by using a programmable logic device such as FPGA (Field Programmable Gate Array). 
     Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs and the like within a range that does not deviate from the gist of the present invention. 
     INDUSTRIAL APPLICABILITY 
     The present invention can be widely applied to information display systems and information display methods, and makes it possible to promote cooperation between pedestrians and vehicles while suppressing influence on the noisy environment. 
     DESCRIPTION OF THE REFERENCE SYMBOLS 
       1  . . . Information display system 
       10  . . . Sensor 
       10   a  . . . Sensor 
       10   b  . . . Sensor 
       10   c  . . . Sensor 
       20  . . . Congestion status determination device 
       30  . . . Route generation unit 
       40  . . . Floor display device 
       50  . . . Autonomous vehicle 
       50   n   1  . . . Autonomous vehicle 
       60  . . . Network 
       100  . . . Target area 
       100   a  . . . Pole 
       100   b  . . . Pole 
       110  . . . Pole 
       120   a  . . . Group 
       120   b  . . . Group 
       120   c  . . . Group