JP2000146603A - Path searching and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a path searching and display device capable of arbitrarily displaying the enlarged drawing of a complicate intersection on a route selected by route searching in a route searching and display device for searching a route to a destination and for displaying it with a map on a display device. SOLUTION: Whether or not an intersection on a route searched by a route searching means 105 is an intersection at which the mark of an intersection to be enlarged is displayed is judged by an intersection judging means 105, and when this is an intersection at which the mark is displayed, a control means 107 allows a display means 103 to display the mark, and allows the display means 103 to display the enlarged drawing of the intersection when the mark is designated by an operation inputting means 104. The intersection at which the mark is displayed is, for example, an intersection whose branch is complicate or an intersection at which many traffic accidents occur.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device for displaying a current position of a car or the like on a display device together with a map.
In particular, the present invention relates to a route search display device that searches for a route to a destination and displays the searched route on a display device.

[0002]

2. Description of the Related Art FIG. 8 shows an outline of a car navigation system. In FIG. 8, reference numeral 1 denotes a direction sensor, which includes a geomagnetic sensor for detecting the absolute running direction of the vehicle, a vibration gyro for detecting the relative running direction of the vehicle, and the like. Reference numeral 2 denotes a distance sensor that generates a pulse corresponding to the number of rotations of the wheels, and 3 denotes various sensor signals such as an on / off signal of a brake switch, a parking switch, and the like, and a power supply voltage monitoring signal. Reference numeral 4 denotes a sensor signal processing unit for processing sensor signals from the azimuth sensor 1 and the distance sensor 2, and 5 denotes a GPS (Global Positioning System).
m) This is a receiver, and this GPS receiver 5 can obtain the position (latitude and longitude) of a receiving point by receiving and calculating radio waves transmitted from a plurality of satellites. Reference numeral 6 denotes a CD-ROM drive.
The OM drive 6 is a CD-RO on which map data is recorded.
The map data is read from M7. Reference numeral 8 denotes a display / operation unit installed in the vehicle interior.
Is a liquid crystal display 8A that displays a map and the current running position, direction, and the like of the automobile;
, A switch for instructing enlargement or reduction of the display map, a switch for instructing a route search, and a destination from among the place names displayed on the liquid crystal display 8A. The switch for selecting is provided. 8C is a cursor key for moving a cursor displayed on the screen in an arbitrary direction and inputting a selected position on the screen. 9 is an apparatus main body.

Next, the configuration of the apparatus main body 9 will be described. Reference numeral 10 denotes a CPU (Central Processing Unit) for performing various calculations, 11 denotes a ROM (Read Only Memory) storing programs for various calculations performed by the CPU 9, 12 denotes an azimuth sensor 1, a distance sensor 2, a GPS receiver 5, a CD. A memory (DRAM) 13 for storing data from the ROM drive 6 and the results of calculations by the CPU 10, and a backup 13 for holding necessary data even when power supply to the apparatus main body 9 is stopped. Memory (SRAM), 14
Is a memory (kanji, font ROM) in which patterns such as characters and symbols to be displayed on the liquid crystal display 8A are stored;
Reference numeral 15 denotes an image processor for forming a display image based on map data, current position data of the own vehicle, and the like.
A memory (VRAM) for storing an image to be displayed on the liquid crystal display 8A by synthesizing map data, current position data and kanji output from the PU 10, kanji such as a town name and a road name output from the font ROM 14, and a font.
Reference numeral 7 denotes an RGB conversion circuit for converting output data of the VRAM 16 into a color signal.
Is output to the liquid crystal display 8A. Reference numeral 18 denotes a communication interface.

FIG. 9 shows a format of data stored in the CD-ROM 7, in which 21 is a disk label, 22 is a drawing parameter, 23 is figure leaf management information,
Is a figure leaf, which has background data, character data,
It stores road data and the like, and stores data for each unit map obtained by dividing a topographic map of the whole of Japan by latitude and longitude. In the figure, a figure describing a wide area roughly and a figure describing a narrow area in detail are set. Each figure is composed of map display levels A, B and C describing the same area. The map display levels A, B, and C describe B in more detail than A and C in more detail than B. Each of the map display levels A, B, and C is composed of map display level management information and a plurality of units. Each unit describes a divided area obtained by dividing the area at each map display level into a plurality. Each unit is composed of a unit header, a character / symbol layer, a background layer, a road layer, an optional layer, and the like. The character / symbol layer records place names, road names, facility names, and the like displayed on the map, the background layer records data for drawing roads, facilities, and the like. As shown in FIG. 10, data on coordinate points (node # e46a and lines (links) describing a road including an intersection, for example, node numbers of nodes, latitude and longitude, link numbers of links, link distances, etc. are stored. 10, circles (○) indicate nodes, lines between nodes indicate links, and black circles (●) of node numbers 4 indicate intersection nodes. The data recorded in the road layer is not directly involved in map display, but is used as road network information for map matching.

[0005] In FIG. 9, reference numeral 25 denotes route search data, and the route search data 25 includes search data for each layer from layer 0 for a narrow area to layer n for a wide area. . The search data of each hierarchy includes node connection data 26, route search evaluation value (link cost)
Data 27 and route display data 28 are provided. The node connection data 26 is data indicating to which other node each node is connected. The link cost data 27 is an evaluation value set for a link between the nodes, and the link cost is an evaluation value indicating an estimated passage time of the link. The route display data 28 records data for displaying the route selected by the route search on the display map.

Next, the operation of the navigation device configured as described above will be described. 8, the output of the direction sensor 1 and the output of the distance sensor 2 are sent to the CPU 10 via the sensor processing unit 4. The CPU 10 calculates the current position of the vehicle, and obtains the latitude and longitude of the current position. The current position is corrected based on the data from the GPS receiver 5. The map data of the unit corresponding to the current position is obtained by the CD-ROM drive 6 based on the current position obtained in this manner.
7, and the map data is stored in the memory (DRAM) 12 via the communication interface 18. A part of the map data stored in the DRAM 12 is C
The data is read by the PU 10, converted into image data by the image processor 15, and written into the image memory 16. The image data stored in the image memory 16 is stored in the RGB conversion circuit 1
The color signal is converted into a color signal at 7 and sent to the liquid crystal display 8A, and a map of a predetermined range centering on the current position is displayed. If the map data read from the DRAM 12 contains character codes and symbol codes, the patterns corresponding to these character codes and symbol codes are kanji and font ROM1.
4, characters such as place names and symbols such as schools are displayed together with the map on the liquid crystal display 8 e460.
Further, the current position displayed on the liquid crystal display 8A is sequentially changed based on the traveling speed and traveling azimuth sequentially obtained as the vehicle travels.

Next, the operation of the conventional route search will be described with reference to FIGS. As shown in FIG. 11, first, a destination is set in step S1. The setting of the destination is performed by operating the touch panel 8B, for example, by inputting the address of the destination or by specifying a point on the map displayed on the liquid crystal display 8A. In step S2, it is determined whether to start a route search. This determination is made based on whether or not the route search switch on the touch panel 8B of the operation / display device 8 has been operated. Step S2
If it is determined that the route search switch has been operated, the process proceeds to step S3 where a route search is performed. In this route search, the link costs of all the routes from the starting point (current position node) to the destination node are added, and the route with the lowest link cost is selected. The route selected in step S3 is displayed, for example, in red on the display map of the liquid crystal display 8A in step S4.

FIG. 12 shows the route search step S3 in FIG. 11 in more detail. In FIG. 12, first, in step S11, a departure node and a destination node closest to the departure and destination positions are selected. Next, in step S12, the route search data including the departure node is stored in the CD-R.
The data is read from the OM 7 and a route search on the departure point side is performed in step S13. As described above, this route search selects a route with the lowest total link cost. Next, in step S14, it is determined whether the route searched in step S13 is connected to the destination node. If the distance from the departure point to the destination is relatively short and the data read from the CD-ROM 7 in step S12 includes the destination node, step S1 is executed.
If the answer is yes in step S4, but the destination is far from the starting point, the answer is no in step S14,
Proceed to 15. In step S15, route search data including the destination node is read from the CD-ROM 7, and in step S16, a route search on the destination side is performed. In step S17, it is determined whether or not the route selected by the route search on the destination side in step S16 is connected to the search route on the departure side. If the result of this determination is no and e4bb is determined, the search hierarchy is raised by one rank in step S18. If the read data in step S12 and step S15 is the route search data of layer 0, step S1
At 8, the rank is raised to Tier 1. Next, in step S19, the starting node and the destination node are reset, and the process returns to step S12. Step S14 or step S17
If YES is determined in step S20, a route from the departure place to the destination is formed in step S20, route display data is created in step S20A, and the process ends. The route selected by the above route search process is displayed on the map displayed on the liquid crystal display 8A.

[0009]

However, in the above-described conventional example, it is determined whether or not the intersection selected on the route search and present on the route displayed on the liquid crystal display 8A is a complex intersection such as a three-dimensional intersection. Or, it was not possible to grasp in advance what kind of configuration the intersection was.

The present invention solves the above-mentioned conventional problems. In addition to displaying the position of a complex intersection such as a three-dimensional intersection on a route selected by a route search and displayed on a display device, the present invention provides the above-mentioned complex intersection. It is an object of the present invention to provide a route search and display device that can display an enlarged image.

[0011]

In order to achieve the above object, according to the present invention, when an intersection on a route searched by a route search means is a complex intersection, an intersection mark to be enlarged is displayed. By specifying
An enlarged view of the intersection is displayed. This makes it possible to know in advance whether or not the intersection existing on the route is a complicated intersection such as a three-dimensional intersection or what kind of configuration the intersection is.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention comprises a map data storage means in which road data is recorded, a current position calculation means for detecting a current position of a vehicle, and a data read from the storage means. Display means for displaying the outputted road map and the current position obtained by the current position calculation means, input means for inputting a destination, and searching for a route to the input destination by the display means Route search means to be displayed;
Intersection determination means for determining whether or not the intersection on the route searched by the route search means is an intersection for displaying an enlargement target intersection mark, and when the searched intersection is an intersection for displaying an enlargement target intersection mark And a control means for displaying the mark on the display means and designating the mark from the input means to display an enlarged view of the intersection on the display means. , The intersection that exists on the route,
Whether or not the intersection is a complicated intersection such as a three-dimensional intersection, or what kind of configuration the intersection is, can be grasped in advance.

[0013] According to a second aspect of the present invention, when the intersection on the route selected by the route searching means is an intersection with complicated branches or an intersection with many accidents, an intersection to be displayed is an intersection mark to be enlarged. The route search and display device according to claim 1, wherein a complicated intersection such as a three-dimensional intersection or an intersection with many accidents can be grasped in advance.

According to a third aspect of the present invention, different enlargement target intersection marks are displayed according to the complexity of branching of the intersection on the route selected by the route searching means or the frequency of accidents. 2. The route search and display device according to item 2, wherein the complexity of branching at the intersection and the frequency of accidents can be identified by looking at the intersection mark to be enlarged.

According to a fourth aspect of the present invention, there is provided a storage means in which road data and complicated intersection data are recorded, a current position calculating means for detecting a current position of the vehicle, and a road map read from the storage means. Display means for displaying the current position calculated by the current position calculation means, input means for inputting a destination, and route search means for searching for a route to the input destination and displaying the route on the display means And displaying an enlargement target intersection mark on the complex intersection on the route searched by the route search means on the display means, and specifying the displayed enlargement target intersection mark from the input means to enlarge the intersection. A route search and display device provided with control means for displaying a figure on the display means, wherein the intersection existing on the route is a complex intersection such as a three-dimensional intersection Those that can be known in advance, such as whether or how such an arrangement intersection whether it is a.

According to a fifth aspect of the present invention, there is provided a storage means in which road data and intersection data with many accidents are recorded,
Current position calculating means for detecting the current position of the vehicle, display means for displaying a road map read from the storage means and a current position obtained by the current position calculating means,
Input means for inputting a destination, a route search means for searching for a route to the input destination and displaying the same on the display means, and a large number of accidents at intersections on the route searched by the route search means. Control means for displaying a multi-accident intersection mark at the intersection on the display means, and displaying the enlarged view of the intersection on the display means by designating the displayed multi-accident intersection mark from the input means. This is a route search and display device that can grasp in advance whether an intersection existing on a route is a complex intersection such as a three-dimensional intersection, or what kind of configuration the intersection is.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment) FIG. 1 shows a route search and display device according to an embodiment of the present invention, which is a simplified illustration of the navigation device shown in FIG. 8, and the overall operation is almost the same. . In FIG. 1, reference numeral 101 denotes a map data storage unit such as a CD-ROM on which road data is recorded;
02 is a current position calculating means for detecting the current position of the vehicle based on data from a GPS receiver or the like. 103 is a road map read from the map data storing means 101 and a current position obtained by the current position calculating means 102. A display means such as a liquid crystal display for displaying the information; 104, an operation input means such as a touch panel for inputting a destination; 105, a route search means for searching for a route to the input destination and displaying the route on the display means 103; The intersection determining means 107 for determining whether or not the intersection on the route searched by the route searching means is an intersection displaying an intersection mark to be enlarged, 107 controls the entire route searching and displaying device and the route searching means 105 The searched intersection is the intersection determination means 1
If it is determined at step 06 that the intersection is an intersection for displaying an enlargement target intersection mark, the mark is displayed on the display means 103.
Is displayed on the display unit 103, and by specifying the mark from the operation input unit 104, a fake e467 map of the intersection is displayed on the display unit 103.

FIG. 2 shows the format of data stored in the map data storage means 101 used in the present embodiment. Only the differences from the format stored in the conventional CD-ROM shown in FIG. 11 will be described. explain. 2
Reference numeral 9 denotes an enlarged view layer of a unit. The enlarged view layer 29 of each unit is used to draw a contour of a road shape such as an intersection displayed based on the data of the background layer 30, an arrow indicating a traveling direction, and the like. Contains data.

Next, a complex intersection display operation in the present embodiment will be described with reference to FIG. First, at step S
In step 01, an intersection to be guided on the route is extracted from the route search result. In step S102, step S101
The complexity of the branch of the intersection to be guided extracted in step (1) is determined. This determination is, for example, to determine whether or not the intersection is a three-dimensional intersection, or to determine the shape of the intersection, for example, whether it is a three-way intersection, a four-way intersection, or a five-way intersection. Step S10
In 3, it is determined based on the determination result in step S102 that a three-dimensional intersection or an intersection with five or more intersections is a complicated intersection. If the predetermined intersection is determined to be a complicated intersection in step S103, the display unit 10 is determined in step S104.
An enlargement target intersection mark is displayed at the position of the complex intersection on the map displayed in 3. FIG. 4 shows a display example on the display means 103 in the present embodiment, where 31 indicates a route to a destination 32 selected by a route search, 33 indicates a current position of the own vehicle, and 34 indicates a position on the route 31. 3 shows an intersection mark to be enlarged displayed at the complex intersection position of.

In FIG. 3, at step S105, the route 3
It is determined whether or not all intersections on 1 have been determined to be complex intersections. If it is determined that all intersections have not been determined, the process returns to step S101 to perform the same processing. If it is determined in step S105 that all intersections on the route have been determined, the process proceeds to step S106. In step S106, it is determined whether or not the enlarged display of the complex intersection has been selected. As shown in FIG. 5, the selection of the enlarged display of the complex intersection is performed by the display unit 1.
The cursor 35 displayed on the screen 03 is moved by the cursor key, and as shown in FIG. 6, the cursor 35 is overlaid on the intersection mark 34 to be enlarged, and the cursor 35 is selected by pressing the cursor key. If it is determined in step S106 that the enlarged display of the complex intersection by the cursor key has been selected, the process proceeds to step S107, in which the background layer 30 of the selected intersection is enlarged to draw an enlarged view of the intersection. Information of the enlarged view layer 29 of the crossed intersection (outline of the road, arrow indicating the traveling direction, etc.)
Is drawn on the drawn background layer. By the processing of step S108, as shown in FIG. 7, the outline of the road, the arrow indicating the direction in which the vehicle can travel, and the like are drawn, and the enlarged view 36 of the complex intersection is displayed. It is displayed on the screen of the means 103.

As described above, according to the first embodiment,
By specifying the mark displayed at the intersection on the route to the destination selected by the route searching means 105,
The shape of this intersection, the direction to proceed, and the like can be confirmed in advance.

In the first embodiment, the enlarged view of the complex intersection is drawn by enlarging the background layer. However, the enlarged view data of each complex intersection is separately recorded in the memory, and the complicated view is recorded by the cursor key. When the enlarged display of the intersection is selected, the enlarged map data of the intersection may be read from the memory and displayed on the display unit 103. Also,
In the first embodiment, the complexity of each intersection is determined by calculation. However, data indicating the complex intersection is recorded in the map data storage unit 101 in advance, and the complex intersection is recorded on the route obtained by the route search. May be displayed at this complicated intersection position.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described. In the second embodiment, the complexity of each intersection on the route obtained by the route search is determined, a plurality of complexity ranks are determined based on the determination result, and different marks are displayed according to the complexity ranks. Is displayed at the intersection position of. In the second embodiment, in step S103 shown in FIG.
When it is determined that the intersection is a complicated intersection, in step S104, an enlargement target intersection mark according to the complexity is selected.
This mark is displayed at the corresponding intersection on the map displayed on the display means 103.

According to the second embodiment, the display means 103
Since the enlargement target intersection mark displayed on the screen is displayed in a different display depending on the complexity, the shape of the intersection and the like can be grasped in advance by associating the mark with the complexity.

(Embodiment 3) Next, Embodiment 3 of the present invention will be described. In the third embodiment, in the data format of the map data storage means 102 shown in FIG. 2, data representing an intersection having many accidents is recorded in the enlarged view layer 29 of each unit, and the route obtained by the route search is recorded. The presence / absence of accident data at each of the above intersections is determined, and a multi-accident intersection mark is displayed according to the determination result.
Is displayed at the corresponding intersection on the map displayed in.

According to the third embodiment, the display means 103
The cursor displayed on the screen is moved by the cursor key, and the cursor is superimposed on the multiple accident intersection mark and the cursor key is pressed, so that an enlarged view of the multiple accident intersection is displayed on the display means 103. It is possible to grasp the shape of the accident intersection. Embodiment 3
Also, the display of the multiple accident intersection mark may be changed according to the frequency of the accident.

In each of the above embodiments, the intersection determining means 106 in FIG. 1 determines whether or not the intersection on the route searched by the route searching means 105 is an intersection for displaying an intersection mark to be enlarged. Or judge intersections with complicated branches or intersections with many accidents.
Data indicating a complex intersection or a multiple accident intersection is recorded in the map data storage means 101 in advance, and if a complex intersection or a multiple accident intersection is included in the route obtained by the route search, the result is used based on the result. The control unit 107 may display an enlargement target intersection mark. Further, the instruction may be given by voice input from the operation input unit 104.

[0028]

According to the present invention, as is apparent from the above embodiment, the shape of the intersection can be enlarged and displayed on the display screen by specifying the intersection mark on the route displayed on the display means by the input means. The shape of the intersection and the route to be traveled can be confirmed in advance. In addition, when the intersection on the route is an intersection with complicated branches or an intersection with many accidents, the intersection mark is displayed.By specifying this intersection mark by the input means, the shape of the complex intersection, the route to travel, etc. It can be confirmed in advance. Further, by changing the intersection mark displayed on the display means according to the complexity of the intersection and the frequency of the accident, the complexity of the intersection and the number of accidents can be easily determined.

Further, according to the present invention, the enlarged intersection mark is displayed at the complicated intersection based on the complicated intersection data recorded in the storage means in advance, and the complicated intersection can be easily grasped, and the complicated intersection mark can be input by the input means. By specifying, an enlarged view of the complex intersection can be displayed, and the shape of the complex intersection, the route to be traveled, and the like can be confirmed in advance.

Further, according to the present invention, an intersection having many accidents is displayed as a mark, so that the intersection having many accidents can be grasped in advance, and an enlarged view of the intersection having many accidents can be obtained by designating this mark by the designation means. Can be displayed, and the shape of the multiple accident intersection, the route to be traveled, and the like can be grasped in advance.

[Brief description of the drawings]

FIG. 1 is a block diagram of a route guidance display device according to an embodiment of the present invention.

FIG. 2 is a data format diagram of a map data storage unit according to the embodiment;

FIG. 3 is an operation flowchart of a route search in the embodiment.

FIG. 4 is an exemplary screen view showing a display example of a search route according to the embodiment;

FIG. 5 is a screen diagram showing a display example of a search route and a cursor in the embodiment.

FIG. 6 is an exemplary screen view showing a display example of a state where an intersection of a search route is designated in the embodiment;

FIG. 7 is an exemplary screen view showing a display example of an enlarged view of an intersection according to the embodiment;

FIG. 8 is a block diagram of a conventional navigation device.

FIG. 9 shows a CD serving as a map data storage unit in a conventional example.
-ROM data format diagram

FIG. 10 is a schematic diagram of road data on map data in a conventional example.

FIG. 11 is an operation flowchart for setting a destination in a conventional example.

FIG. 12 is an operation flowchart of a route search in a conventional example.

[Explanation of symbols]

 Reference Signs List 101 Map data storage means 102 Current position calculation means 103 Display means 104 Operation input means 105 Route search means 106 Intersection determination means 107 Control means

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 000004260 DENSO CORPORATION 1-1-1, Showa-cho, Kariya-shi, Aichi (71) Applicant 000237592 FUJITSU TEN LIMITED 1-2-28, Goshodori, Hyogo-ku, Kobe, Hyogo (72) Inventor Hong Ming, Matsushita Communication Industrial Co., Ltd., 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture (72) Inventor Hiroshi Ogawa 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture Matsushita (72) Inventor Masayuki Kimura 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Yumi Shibata 6-18 Okamachi Harayama, Okazaki City, Aichi Prefecture Aisin AW Co., Ltd. (72) Inventor Toshiya Tsurumi 1-1-1, Showa-cho, Kariya, Aichi Prefecture Inside DENSO Corporation (72) Inventor Takaho Okada 1-28, Goshodori, Hyogo-ku, Kobe, Japan F-term (reference) in Fujitsu Ten Limited 2C032 HB06 HC13 HC24 HC26 2F029 AA02 AB01 AB07 AB09 AC01 AC02 AC04 AC16 AD01 5H180 AA01 BB13 CC12 FF04 FF14 FF22 FF27 FF33 FF72A JJ77 JJ78

Claims (5)

[Claims] 1. A map data storage means in which road data is recorded, a current position calculation means for detecting a current position of a vehicle, a road map read from the storage means and a current position calculated by the current position calculation means. Display means for displaying the current position, input means for inputting the destination, a route search means for searching for a route to the input destination and displaying the route on the display means, and Intersection determining means for determining whether or not the intersection on the searched route is an intersection for displaying an enlargement target intersection mark; and, if the searched intersection is an intersection for displaying an enlargement target intersection mark, Control means for displaying on the display means and displaying an enlarged view of the intersection on the display means by designating the mark from the input means. Display device. 2. When the intersection on the route selected by the route search means is an intersection with complicated branches or an intersection with many accidents, it is determined that the intersection is an intersection for displaying an enlarged target intersection mark. The route search display device according to claim 1. 3. The route search and display device according to claim 2, wherein different enlargement target intersection marks are displayed according to the complexity of branching of the intersection on the route selected by the route search means or the frequency of accidents. . 4. A storage means in which road data and complicated intersection data are recorded, a current position calculating means for detecting a current position of the own vehicle, a road map read from the storage means and the current position calculating means. Display means for displaying the obtained current position; input means for inputting the destination; route search means for searching for a route to the input destination and displaying the route on the display means; An enlarged target intersection mark is displayed on a complex intersection on the searched route on the display unit, and an enlarged view of the intersection is displayed on the display unit by specifying the displayed enlarged target intersection mark from the input unit. A route search and display device comprising: 5. A storage device in which road data and intersection data with a lot of accidents are recorded, a current position calculation device for detecting a current position of the vehicle, a road map read from the storage device and the current position calculation. Display means for displaying the current position obtained by the means, input means for inputting a destination, route search means for searching for a route to the input destination and displaying the same on the display means, and route search A multi-accident intersection mark is displayed on the display means at an intersection with many accidents among the intersections on the route searched by the means, and the displayed multi-accident intersection mark is designated from the input means, so that the intersection is identified. A route search and display device comprising: control means for displaying an enlarged view on the display means.