JP2007108260A - Information processing device, navigation device and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processing device capable of easily creating updating information in which does not cause much trouble even when power supply is shut off, and in which the inside thereof is difficult to be analyzed. <P>SOLUTION: An information processing device for updating map information of a navigation device that displays a map and guides a route to a destination comprises a conversion means (CPU 11) that converts the map information to the image data corresponding to the storage form when the map information is stored in a magnetic storage means of the navigation device, and a storage means (DVD driving device 18) that stores the updating information as the image data acquired by the conversion means in a storage medium (DVD 20). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information processing device, a navigation device, and a storage medium.

  A vehicle-mounted navigation device receives signals transmitted from a plurality of GPS (Global Positioning Systems) satellites to detect the current position of the vehicle, and records information about the vehicle detected by various sensors and a record of the navigation device. Based on the map information recorded in the device, the current position of the vehicle and the road on the map are matched (map matching), and the current position of the vehicle is displayed on the map displayed on the display unit. When a destination is set, guidance (navigation) to the destination is executed.

  By the way, since the road or the facility changes, the map information stored in the navigation device needs to be updated every time a certain period elapses, for example. Conventionally, for example, it has been common to update map information by exchanging a DVD (Digital Versatile Disk) in which map information is stored.

  In recent years, map information is often stored in an HDD (Hard Disk Drive) as magnetic storage means built in a navigation apparatus. In such a navigation device, in order to update the map information, for example, a storage medium such as a DVD storing update map information is purchased, and a file containing the map information is copied from the DVD to the HDD. Thus, it is common to update the map information (see Patent Document 1 and Patent Document 2).

JP 2005-148004 A (paragraph 0068) JP 2005-242636 A (Claim 5)

  By the way, in the techniques described in Patent Document 1 and Patent Document 2, in order to update information in units of files, it is necessary to repeat the following procedure. That is, the file system (1) searches the directory entry of the HDD for the directory to which the target file is written, and (2) calculates the increased size of the directory entry, searches the cluster chain for a free area, and sets it as used. (3) The directory entry is corrected, (4) a free area for storing data is searched from the cluster chain and set to used, and (5) the data is actually written in the area indicated by the free cluster. Usually, there are about thousands to tens of thousands of files constituting map information. Therefore, since it is necessary to repeat such processing for these many files, there is a problem that it takes time to update.

  Further, since the navigation device is mounted on the vehicle, the power supply to the main body is cut off when the engine is stopped. For this reason, when the engine is stopped while the management information such as the directory entry is being updated, a problem may occur in the management information. In such a case, since the file system is damaged and cannot be repaired, there is a problem that all files need to be updated again.

  The map information may have a capacity of about 10 GB or more. However, since the capacity of the DVD in which the update information is stored is about 9 GB, the information for storing all the update information on one DVD is information. Need to be compressed. However, since map information includes a large number of files of various sizes ranging from several bytes to several hundred bytes, there is a problem that it takes time to decompress such a large number of various sizes of files. In addition, in connection with the above-mentioned problem that the power supply is cut off, if the power supply is cut off during the decompression process of a large capacity file, the file cannot be decompressed. When is inserted, it is necessary to repeat the same process from the beginning, and there is a problem that the process becomes useless.

  Further, when map information is stored as a file on a DVD, there is a problem that the inside of data is easily analyzed by a malicious user.

  The present invention has been made on the basis of the above circumstances, and the purpose of the present invention is to easily update the map information, and even if the power supply is cut off, it is difficult to cause problems and internal analysis is difficult. It is an object of the present invention to provide an information processing apparatus capable of generating update information, a navigation apparatus capable of updating map information with such update information, and a storage medium storing such update information.

  In order to achieve the above object, an information processing apparatus according to the present invention includes a magnetic storage unit included in a navigation apparatus in an information processing apparatus that updates map information included in a navigation apparatus that displays a map and guides a route to a destination. Conversion means for converting the map information into image data corresponding to the storage form when the map information is stored in the storage means, and storage means for storing update information as image data obtained by the conversion means in the storage medium .

  In addition to the above-described invention, in the information processing apparatus according to another invention, the conversion unit arranges management information for the magnetic storage unit to manage data at the head of the image data.

  In addition to the above-described invention, in the information processing apparatus according to another invention, the conversion unit arranges the directory information so as to be included in the management information.

  In addition to the above-described invention, an information processing apparatus according to another invention further includes a dividing unit that divides the image data generated by the converting unit into a plurality of data.

  In addition to the above-described invention, an information processing apparatus according to another invention further includes a compression unit that compresses each data divided by the division unit.

  The navigation device of the present invention is a navigation device that displays a map and guides a route to a destination, and includes magnetic storage means that stores map information and update information for updating the map information. By means of reading means for reading the update information from a storage medium in which update information as image data corresponding to the storage form when storing the map information in the storage means is stored in advance, and the update information read by the reading means, Updating means for updating the map information stored in the magnetic storage means.

  Further, the storage medium of the present invention stores update information for updating map information included in a navigation device that displays a map and guides a route to a destination, and updates the map information in the navigation device. In a computer-readable storage medium for storing a program for executing the process, the computer is update information for updating the map information, and corresponds to the storage form when the map information is stored in the magnetic storage means Reading means for reading the update information from a storage medium in which update information as image data is stored in advance, and updating means for updating the map information stored in the magnetic storage means with the update information read by the reading means Make it work.

  The present invention relates to an information processing apparatus that can easily generate update information that is easy to update map information, and that is less likely to cause problems even when power supply is cut off, and that is difficult to analyze internally. A navigation apparatus capable of updating information and a storage medium storing such update information can be provided.

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

  FIG. 1 is a block diagram showing a configuration example of an information processing apparatus according to an embodiment of the present invention. As shown in this figure, a CPU (Central Processing Unit) 11, graphic processor 12, HDD 13, memory 14, video memory 15, display device 16, input device 17, and DVD drive device 18 are provided.

  Here, the CPU 11 as the converting means, the dividing means, and the compressing means is a central processing unit that executes various arithmetic processes in accordance with programs stored in the HDD 13 or the memory 14 and controls each part of the apparatus. is there.

  The graphic processor 12 performs drawing processing according to the command list read from the HDD 13 and developed in the video memory 15, converts the obtained image into a video signal, and supplies the image to the display device 16 for display. It is a processing device.

  The HDD 13 is a storage device having a map information DB (Data Base) 13a and a control program 13b. Here, the map information DB 13a has map information. In this specification, the map information is information for displaying a map (terrain, road, facility, etc.) on the navigation device 50 described later, information about the facility, and information necessary for performing destination search ( (Information such as address, phone number, postal code), information for displaying VICS (Vehicle Information and Communication System) information, information necessary for route search, and information necessary for route guidance ( Voice information). Information other than these can also be included in the map information.

  The control program 13b controls each part of the information processing device 10, and updates information for updating the map information stored in the HDD 53 of the navigation device 50 based on the map information stored in the map information DB 13a. The process to generate is executed.

  The memory 14 is constituted by a semiconductor storage device such as a ROM (Read Only Memory) or a RAM (Random Access Memory), and stores a program executed by the CPU 11 and temporarily stores a program or data to be executed by the CPU 11. To remember.

  The video memory 15 is a semiconductor storage device that temporarily stores a command list to be processed by the graphic processor 12.

  The display device 16 is configured by, for example, a CRT (Cathode Ray Tube) monitor or an LCD (Liquid Crystal Display), and inputs a video signal generated by the graphic processor 12 to display and output a corresponding image.

  The input device 17 is, for example, a keyboard or a mouse, and generates and outputs information corresponding to a user operation.

  The DVD drive device 18 as a storage unit executes a process of writing update information generated by a process to be described later on the DVD 20 as a storage medium.

  FIG. 2 is a block diagram showing a configuration example of the navigation device according to the embodiment of the present invention. As shown in this figure, the navigation device 50 according to the embodiment of the present invention includes a CPU 51, a graphic processor 52, an HDD 53, a memory 54, a video memory 55, an LCD 56, a GPS receiver 57, a gyro device 58, a sensor group 59, and an input. A device 60, a DVD drive device 61, and a touch panel 62 are included. The navigation device 50 is mounted on an automobile or the like as a moving body.

  Here, the CPU 51 as update means is a central processing unit that executes various arithmetic processes according to a program stored in the HDD 53 or the memory 54 and controls each part of the apparatus.

  The graphic processor 52 executes a drawing process according to the command list read from the HDD 53 and developed in the video memory 55, converts the obtained image into a video signal, supplies the image to the LCD 56, and displays it. It is.

  The HDD 53 as magnetic storage means is a storage device having a map information DB 53a and a control program 53b. Here, the map information DB 53a has map information.

  The control program 53b controls each part of the navigation device 50, and executes a process for displaying a map based on the vehicle position supplied from the GPS receiver 57 and the map information stored in the map information DB 53a. Further, route guidance processing to the destination is executed as necessary.

  The memory 54 is configured by a semiconductor storage device such as a ROM or a RAM, and stores a program executed by the CPU 51 and temporarily stores a program or data to be executed by the CPU 51.

  The video memory 55 is a semiconductor storage device that temporarily stores a command list to be processed by the graphic processor 52.

  The LCD 56 receives the video signal generated by the graphic processor 52 and displays and outputs a corresponding image.

  The GPS receiver 57 receives radio waves from a plurality of GSP satellites (not shown), extracts time information superimposed on the radio waves, specifies the current position from the arrival time difference between the radio waves, and receives position information (for example, , Latitude information and longitude information) to the CPU 51.

  The gyro device 58 detects the angular velocity of the vehicle with respect to each control axis and supplies it to the CPU 51 when the vehicle changes its direction.

  The sensor group 59 includes, for example, a vehicle speed sensor for detecting the vehicle speed, a side brake sensor for detecting that the side brake is operated, and the like.

  The input device 60 is, for example, an operation button provided on the periphery of the display unit of the LCD 56 and a remote controller.

  When a DVD 20 as a storage medium is inserted, the DVD drive device 61 as a reading unit executes a process of reading information recorded on the DVD 20. For example, when the DVD 20 storing update information for updating (upgrading) the map information is inserted, the map information stored in the map information DB 53a is updated based on the processing described later. When a DVD on which video and audio are recorded is inserted, the stored video and audio are read and reproduced.

  The touch panel 62 is arranged so as to be superimposed on the LCD 56, and desired information can be input by the user operating these portions with reference to buttons displayed as images on the LCD 56. .

  Next, the operation of the present invention will be described.

1. Operation for creating DVD 20 storing update information

  First, a process for creating the DVD 20 in which update information is stored in the information processing apparatus 10 will be described.

  Since the map information stored in the map information DB 53a of the HDD 53 of the navigation device 50 is fixed information that is not automatically updated, the map information becomes old with time. Therefore, the manufacturer who is the provider of the navigation apparatus 50 creates the DVD 20 storing the latest map information and distributes the map information to the user for a fee / free of charge, thereby updating the map information.

  In such a case, it is necessary to create the DVD 20 in which the latest map information is stored. An example of processing executed in such a case will be described with reference to FIG. When the process of FIG. 3 is executed, the following steps are executed.

  Step S <b> 10: The CPU 11 collects files that should constitute new map information and stores them in the HDD 13. That is, the CPU 11 collects files to be updated in accordance with the operation of an operator (mainly a manufacturer or software manufacturer) and stores it in the map information DB 13 a of the HDD 13.

  Step S11: The CPU 11 acquires the characteristics of the HDD 53 built in the target navigation device 50. Specifically, information such as the storage capacity of the HDD 53 and the type of file system is acquired.

  Step S12: The CPU 11 generates image data according to the storage form when the map information collected in step S10 is stored in the HDD 53 based on the information of the HDD 53 acquired in step S11.

  4 and 5 are diagrams for explaining the image data. As shown in FIG. 4, the map information is composed of a plurality of files # 1 to #j. The files # 1 to #j are, for example, files having a capacity of about several bytes to several hundred megabytes, and the capacity of each file is not constant. When such a file is stored in the hard disk 530 of the HDD 53, information on a FAT (File Allocation Table) and directory as management information to be described later is stored in the area of the outer periphery of the hard disk 530, and the area inside the area Stores data in cluster units.

  FIG. 5 is a diagram showing an example of the image data (data stored in the hard disk 530 in FIG. 4) generated in step S12. As shown in this figure, the information stored in the hard disk 530 is composed of management information and data. The management information is composed of a FAT cluster chain and a directory entry. The FAT cluster chain has information indicating the position and order of files arranged in clusters. The directory entry has information indicating the name and storage location of the file. In this example, there are n directory entries of directory entries # 1 to #n.

  On the other hand, the data is divided into a plurality of clusters and stored, and in this example, the data has m pieces of data # 1 to data #m.

  Note that when a file is stored in the HDD, generally, as shown in FIG. 6, a directory entry and data are mixed. However, in this embodiment, the directory entries # 1 to #n are collectively arranged immediately after the FAT cluster chain.

  Step S13: The CPU 11 extracts the management information shown in FIG. 5 from the image data generated in step S12. That is, in the example of FIG. 5, the CPU 11 extracts the FAT cluster chain and the directory entries # 1 to #n as a set of data from the image data.

  Step S14: The CPU 11 extracts the data shown in FIG. 5 from the image data generated in step S12. That is, in the example of FIG. 5, the CPU 11 extracts data # 1 to #m as a group of data from the image data.

  Step S15: The CPU 11 divides the data extracted in step S14 into 128 kB size blocks. The reason for dividing into 128 kB size will be described later.

  Step S16: The CPU 11 performs compression processing on the management information extracted in step S13, and performs compression processing on each of the data divided into 128 kB size blocks in step S15. FIG. 7 shows an overview of the processing executed in step S16. As shown in FIG. 6, the management information including the FAT cluster chain and the directory entries # 1 to #n is subjected to compression processing to generate compression management information. Further, data consisting of data # 1 to #m is divided into 128 kB size blocks, and then compression processing is performed on each block (128 kB size block) to obtain p pieces of compressed data # 1 to ##. p is generated.

  Step S17: The CPU 11 executes a process of writing the compression management information generated by the compression process in step S16 and the compressed data # 1 to #p to the DVD 20. That is, the CPU 11 sends the compression management information and the compressed data # 1 to #p to the DVD drive device 18 and instructs it to write to the DVD 20. As a result, the DVD drive device 18 executes a process of writing the compression management information received from the CPU 11 and the compressed data # 1 to #p to the DVD 20. At this time, a program for updating the map information in the HDD 53 (hereinafter referred to as “update program”) is simultaneously written on the DVD 20.

  With the above processing, the DVD 20 storing update information for updating the map information is completed. The DVD 20 completed in this way is distributed to users for a fee / free of charge through a store or the like. Instead of distributing the DVD 20 itself, for example, a plurality of DVDs may be duplicated using the DVD 20 as a master DVD, and the duplicated DVDs may be distributed.

2. Operation for updating map information of navigation device 50 by DVD 20

  The user who receives the DVD 20 manufactured in this way starts the engine of the vehicle equipped with the navigation device 50 shown in FIG. 2 and turns on the power of the navigation device 50. Then, the user inserts the DVD 20 into an insertion port (not shown) of the DVD drive device 61. Then, the DVD drive device 61 reads information stored in the DVD 20 and recognizes that the DVD 20 is a map information updating DVD. Then, the CPU 51 reads the update program stored in the DVD 20, stores it in the memory 54, and executes it.

  When the update program is executed, the following processing shown in FIG. 8 is executed.

  Step S30: The CPU 51 reads out the compression management information stored in the DVD 20. That is, the CPU 51 instructs the DVD drive device 61 to read the compression management information. As a result, the DVD drive device 61 reads the compression management information stored on the DVD 20 and supplies it to the CPU 51.

  Step S31: The CPU 51 performs a decompression process on the compression management information read in step S30. As a result, the original management information before compression is obtained.

  Step S32: The CPU 51 supplies the management information obtained by the decompression process of step S31 to the HDD 53 and causes the HDD 53 to write it. As a result, the management information is stored in the HDD 53 in the same state as in FIG.

  Step S33: The CPU 51 assigns an initial value 1 to a variable i for counting the number of processes.

  Step S34: The CPU 51 reads the compressed data #i from the DVD drive device 61. That is, the CPU 51 instructs the DVD drive device 61 to read the compressed data #i. As a result, the DVD drive device 61 reads the compressed data #i stored in the DVD 20 and supplies it to the CPU 51. For example, when i = 1, compressed data # 1 is read.

  Step S35: The CPU 51 performs a decompression process on the compressed data #i read in step S34. As a result, the original data of 128 kB size is obtained.

  Step S36: The CPU 51 transfers the data obtained by the decompression process of step S35 to the HDD 53. In the HDD 53, the data transferred from the CPU 51 is written in a predetermined area. As a result, the data is stored in the state shown in FIG.

  Step S37: The CPU 51 increments the value of the variable i by 1.

  Step S38: The CPU 51 determines whether or not the power of the navigation device 50 is turned off. If the power is turned off, the CPU 51 proceeds to Step S39, and otherwise proceeds to Step S40.

  Step S39: The CPU 51 executes a resume process. That is, when the power is turned on again, the CPU 51 saves the value of the variable i in order to continue updating from the next data after the data that has been transferred to the HDD 53 in the current process. Execute the process to stop the system safely.

  Even if the power is turned off during the update of the map information by the processing of step S39, the system is safely stopped and the next time the power is turned on, Is transferred to the HDD 53 and written.

  In the present embodiment, the data size is 128 kB. Even if the power is turned off while updating the map information, the update process is immediately interrupted and the size is set so that the system can be safely stopped. Has been. In other words, if the capacity is about 128 kB, for example, even if the power is turned off during the read process or the decompression process, the read process and the decompression process are executed and the data is stored in the HDD 53. Later, it is possible to secure a time margin for shifting to the system stop process. Even if the system is stopped immediately during the reading process, the decompressing process, or the writing process, only the data of 128 kB is lost and the previous data is valid, so the loss is reduced. Can do.

  Step S40: The CPU 51 determines whether or not all the data has been processed. If not, the CPU 51 returns to step S34 and repeats the same processing. Otherwise, the processing ends. For example, in the example of FIG. 7, the process is repeated p times.

  When the above processing is completed, the management information and data are stored in the HDD 53 in the same order and arrangement as shown in FIG. The user or CPU 51 validates the updated map information by restarting the system.

  According to the above processing, the image data stored in the HDD 53 is generated, and the map information is updated based on the image data. Therefore, the time required for the update is compared with the case of updating in units of files. Can be shortened.

  In the above embodiment, the FAT cluster chain and the directory entry are collected at the head as management information, and the management information is transferred to the HDD 53 first and stored. Management information that is important information can be preferentially transferred. Note that the management information update is completed in about several seconds. Therefore, the most important information can be transferred at an early stage of the update process (a period during which the power supply is unlikely to be turned off). After that, since it is not necessary to access the management information, even if the power is turned off, the entire file system cannot be repaired due to the damage of the management information, and it is necessary to repeat all the update processes from the beginning. It does not occur.

  Further, in the above embodiment, the data is divided into 128 kB size blocks and each is compressed, so that compression processing and decompression processing are performed as compared with the case where various files of different sizes are mixed. It becomes possible to execute efficiently. Further, even when the power is turned off during the update process, the process can be completed with certainty, so that the process up to that point can be prevented from being wasted. Furthermore, when the power is turned on again, the update process can be reliably restarted.

  In the above embodiment, the map information is stored in the DVD 20 as image data corresponding to the case where the map information is stored in the HDD 53. Therefore, the data analysis is performed as compared with the case where the map information is stored in the original file state. It becomes difficult. Therefore, information can be protected from malicious users.

  The above-described embodiments are preferred examples of the present invention, but the present invention is not limited to these, and various modifications and changes can be made without departing from the scope of the present invention. is there.

  For example, in the above embodiment, update data stored in the DVD 20 is read to update the map information stored in the HDD 53. For example, a storage medium other than the DVD 20 (for example, a CD-ROM) ) May be read, or the update information may be read via telecommunication means (for example, the Internet).

  In the above embodiment, the update order of the files is not particularly mentioned, but the files are grouped in units of functions, updated in units of functions, and the functions that have been updated are sequentially activated. It may be usable. Specifically, the file for displaying a basic map (a map with a scale of 100 m or more) is updated first, and the other map (a map with a scale of less than 100 m) is updated later. Other functions (for example, destination search function, VICS display function, route search function, and route guidance function) may be updated in the order based on the user's preference or past use frequency. According to such an embodiment, even during the update process of the map information, the function that has been updated can be used, so that the convenience for the user can be improved.

  In the above embodiment, the management information is also compressed. However, the management information has a small capacity and needs to be updated quickly. It may be.

  In the above embodiment, the data is divided into 128 kB and compressed, but may be divided into other sizes. Further, it may be stored as it is without being compressed.

  In the above embodiment, map information is converted into image data by a program. For example, a standard HDD is prepared, and a file is actually stored in the image data. May be generated. According to such processing, the trouble of creating a conversion program can be omitted.

  The above processing functions are realized by a computer as shown in FIG. 1, for example. In that case, a program describing the processing contents of the functions that the image processing apparatus and the navigation apparatus should have is provided. By executing the program on the computer, the processing function is realized on the computer. The program describing the processing contents can be recorded on a computer-readable recording medium. Examples of the computer-readable recording medium include a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory. Examples of the magnetic recording device include a hard disk device (HDD), a flexible disk (FD), and a magnetic tape. Examples of the optical disk include a DVD, a DVD-RAM (Random Access Memory), a CD-ROM (Compact Disk Read Only Memory), and a CD-R (Recordable) / RW (ReWritable). Magneto-optical recording media include MO (Magneto-Optical Disk).

  When distributing the program, for example, portable recording media such as a DVD and a CD-ROM on which the program is recorded are sold. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.

  The computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. In addition, each time the program is transferred from the server computer, the computer can sequentially execute processing according to the received program.

  The present invention can be used in a navigation device that displays a map and guides a route to a destination.

It is a block diagram which shows the structural example of the information processing apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structural example of the navigation apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the process performed in the information processing apparatus shown in FIG. It is a figure which shows a mode that image data is produced | generated by the process shown in FIG. It is a figure for demonstrating the outline of the image data produced | generated in the process shown in FIG. It is a figure which shows the storage form at the time of storing information in HDD normally. It is a figure for demonstrating a mode that the image data produced | generated in the process shown in FIG. 3 is compressed. 3 is a flowchart showing an example of processing executed in the navigation device shown in FIG. 2.

Explanation of symbols

10 Information processing apparatus 11 CPU (conversion means, dividing means, compression means)
18 DVD drive (storage means)
20 DVD (storage media)
50 navigation device 51 CPU (update means)
53 HDD (magnetic storage means)
61 DVD drive (reading means)

Claims (7)

In an information processing apparatus that updates map information of a navigation apparatus that displays a map and guides a route to a destination,
Conversion means for converting the map information into image data corresponding to a storage form when the map information is stored in the magnetic storage means included in the navigation device;
Storage means for storing update information as image data obtained by the conversion means in a storage medium;
An information processing apparatus comprising:   The information processing apparatus according to claim 1, wherein the conversion unit arranges management information for the magnetic storage unit to manage data at the head of the image data.   The information processing apparatus according to claim 2, wherein the conversion unit arranges directory information included in the management information.   The information processing apparatus according to claim 1, further comprising a dividing unit that divides the image data generated by the converting unit into a plurality of data.   5. The information processing apparatus according to claim 4, further comprising compression means for compressing each data divided by the dividing means. In a navigation device that displays a map and guides the route to the destination,
Magnetic storage means for storing map information;
Update information for updating the map information, the update information from a storage medium in which update information as image data corresponding to a storage form when the map information is stored in the magnetic storage means is stored in advance Reading means for reading
Updating means for updating the map information stored in the magnetic storage means with the update information read by the reading means;
A navigation device comprising: Update information for updating the map information of the navigation device that displays the map and guides the route to the destination is stored, and stores a program that causes the navigation device to execute processing for updating the map information In a computer readable storage medium,
Computer
Update information for updating the map information, the update information from a storage medium in which update information as image data corresponding to a storage form when the map information is stored in the magnetic storage means is stored in advance Reading means for reading out,
Updating means for updating the map information stored in the magnetic storage means with the update information read by the reading means;
A computer-readable storage medium characterized by functioning as a storage medium.

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