JP2009258180A - Virtual position display system, virtual position displaying method, and display terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a virtual experience of a moving distance in the same manner in the real space. <P>SOLUTION: The virtual position display system 10 is provided with: a map database 31 to store map information showing locations different from those in the real space, a position acquisition means 203 to acquire positional information of a current location in the real space, a position computing means 208 to calculate the position of a virtual current location virtually expressed in accordance with the current location in the real space, and a display means 204 to display the virtual current location calculated by the position computing means 208 along with the map information acquired from the map database 31. By setting an initial position in the location different from that in the real space as a virtual base point and setting a desired current location among the current locations in the real space, from which the position acquisition means acquires the positional information in accordance with the virtual base point, as a base point, the position computing means 208 calculates the virtual current location based on the virtual base point, the base point, and the positional information acquired by the position acquisition means at predetermined intervals. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a system for displaying a virtual world, and in particular, a virtual position display configured to virtually represent movement and position in real space as movement and position at a point different from real space. The present invention relates to a system virtual position display method and a display terminal device.

  In recent years, navigation systems using GPS (Global Positioning System) have been widely used. In such a navigation system, a GPS signal transmitted from a plurality of GPS satellites orbiting the earth is received by a GPS antenna, and the position of the satellite is identified by analyzing the satellite position and clock information included in the GPS signal. can do.

  In a navigation system using GPS, map data including the current position of a terminal device such as a mobile phone equipped with a GPS receiver that receives a signal from a GPS satellite and is positioned is distributed from a route search server to be transmitted to the terminal device. The technique of displaying in is generally known.

  In addition, a technique for displaying the displacement of the present location in the real world obtained from GPS or the like as the displacement of a virtual world such as a maze is disclosed in, for example, “Patent World” in Japanese Patent Laid-Open No. 2001-70656 below. System and method for displaying In this Patent Document 1, the displacement of the current position is obtained from the difference between the current position and the position before the displacement is obtained, and the displacement of the current position and the displacement of the virtual world are matched with the virtual world map. It is disclosed that a virtual conversion rate is calculated with respect to the displacement of the current position and displayed as a virtual displacement.

  According to the technology disclosed in Patent Document 1, the movement of the self is not limited to the display reflecting the real world such as a map, but can be reflected in a world apart from the real world. Without being limited to the situation, you can enjoy your movement in a free world according to your own preferences.

JP 2001-70656 A (paragraph [0005] to paragraph [0008])

  By the way, in the display method of the virtual world disclosed in the above-mentioned Patent Document 1, when the virtual world is a real place, the virtual world map corresponds to the displacement of the current position. The calculation process of replacing the displacement of the virtual world with the conversion ratio is repeated every time a displacement accompanying the movement occurs to express the displacement of the virtual world.

  However, every time a displacement associated with the movement of the current position is acquired, a conversion calculation process is performed. Therefore, there is a problem that an accumulated error increases depending on the number of calculations. In addition, since the conversion ratio is determined so as to match the map of the virtual world, there is a problem that the movement of the current position cannot be accurately reflected in the movement of the virtual world.

  The inventor of the present application has conducted various studies to solve the above problems, and as a result, a virtual base point at a point different from the real space, a base point in the real space corresponding to the virtual base point, and a predetermined time interval. The present invention has been completed with the idea that the above-mentioned problems can be solved by calculating the virtual current location based on the acquired position information.

  That is, the present invention has an object to solve the above-mentioned problems, and a virtual position display system, a virtual position display method, and a display terminal that can virtually experience the sense of distance of movement in the same way as in real space The object is to provide an apparatus.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
A virtual position display system that virtually represents movement and position in real space as movement and position at a point different from real space,
A map database storing map information representing points different from the real space;
Position acquisition means for acquiring position information of the current location in real space;
Position calculating means for calculating the position of a virtual current location that is virtually represented corresponding to the current location in real space;
Display means for displaying the virtual current location calculated by the position calculation means together with the map information acquired from the map database;
With
The position calculating means uses an initial position at a point different from the real space as a virtual base point, and uses a desired current position as a base point in a real space in which the position acquisition means acquires position information in association with the virtual base point, A virtual current location is calculated based on the virtual base point, the base point, and position information acquired by the position acquisition means at predetermined time intervals.

  According to claim 2 of the present application, in the virtual position display system according to claim 1, when the position acquisition unit acquires position information of the current location at predetermined time intervals, the latitude included in the position information is calculated. A position comparison unit that compares the latitude of the base point and, if the difference in latitude is greater than or equal to a predetermined value, replaces the current location acquired last time by the location acquisition unit and the corresponding virtual current location as a base point and a virtual base point, respectively. It is characterized by having.

The invention according to claim 3 of the present application is
In a virtual position display method for virtually representing movement and position in real space as movement and position at a point different from real space,
A first step in which an initial position at a point different from the real space is a virtual base point;
A second step using a desired current location as a base point in a current location in a real space in which position acquisition means acquires position information in association with the virtual base point;
A third step of acquiring position information of the current location in the real space by the positioning means at predetermined time intervals;
A fourth step of calculating and displaying a virtual current location based on the virtual base point, the base point, and position information acquired by the position acquisition means at predetermined time intervals;
It is characterized by having.

  The invention according to claim 4 of the present application is the virtual position display method according to claim 3, wherein when the position acquisition unit acquires position information of the current location at predetermined time intervals, the position information If the difference between the latitudes is greater than or equal to a predetermined value, the current location acquired last time by the position acquisition unit and the corresponding virtual current location are respectively set as the base point It includes the step of replacing as a virtual base point.

Furthermore, the invention according to claim 5 of the present application is
A virtual position display device that virtually represents movement and position in real space as movement and position at a point different from real space,
Position acquisition means for acquiring position information of the current location in real space;
Position calculating means for calculating the position of a virtual current location that is virtually represented corresponding to the current location in real space;
Display means for displaying the virtual current location calculated by the position calculation means together with the map information acquired from the map database;
With
The position calculating means uses an initial position at a point different from the real space as a virtual base point, and uses a desired current position as a base point in a current position in the real space where the position acquisition means acquires position information in association with the virtual base point, A virtual current location is calculated based on the virtual base point, the base point, and position information acquired by the position acquisition means at predetermined time intervals.

  According to claim 6 of the present application, in the display terminal device according to claim 5, when the position acquisition unit acquires position information of the current location at predetermined time intervals, the latitude included in the position information and the If the latitude of the base point is compared and the difference in latitude is equal to or greater than a predetermined value, a position comparison unit that replaces the current location acquired last time by the location acquisition unit and the corresponding virtual current location as a base point and a virtual base point, respectively. It is characterized by having.

  In the invention according to claim 1, a map database storing map information representing points different from the real space, position acquisition means for acquiring position information of the current location in the real space, and virtual corresponding to the current location in the real space Position calculating means for calculating the position of the virtual current location expressed in an automatic manner, and display means for displaying the virtual current location calculated by the position calculating means together with the map information acquired from the map database, the position calculating means The initial position at a point different from the real space is set as a virtual base point, the position acquisition unit acquires position information in association with the virtual base point, and the desired current position in the real space is set as a base point, and the virtual base point A virtual current location is calculated based on the base point and the location information acquired by the location acquisition means at predetermined time intervals. It was configured to.

  According to such a configuration, since the movement of the current position can be converted into movement on another map, the sense of distance of movement in the real space can be virtualized at a point different from the real space as in the real space. It becomes possible to experience.

  According to a second aspect of the present invention, in the virtual position display system according to the first aspect, when the position acquisition unit acquires position information of the current location at predetermined time intervals, the latitude included in the position information and the If the latitude of the base point is compared and the difference in latitude is equal to or greater than a predetermined value, a position comparison unit that replaces the current location acquired last time by the location acquisition unit and the corresponding virtual current location as a base point and a virtual base point, respectively. It was configured to provide.

  According to such a configuration, the movement of the current position can be converted into movement on another map while suppressing an error, so that the distance of movement in the real space is different from the real space as in the real space. It becomes possible to experience virtually at the point.

  In the inventions according to claims 3 and 4, a virtual position display method for realizing the virtual position display system according to claims 1 and 2 can be provided, respectively. In the invention concerning Claim 6, the display terminal device which comprises the virtual position display system concerning Claim 1 and Claim 2, respectively can be provided now.

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, in the following embodiment, a map display system for embodying the technical idea of the present invention is illustrated, and the present invention is specified to this map display system, map display method, and map display device. However, the present invention is equally applicable to the virtual position display system, the virtual position display method, and the display terminal device according to other embodiments included in the claims.

  FIG. 1 is a block diagram showing a configuration of a map display system 10 including a map display device 20 according to an embodiment of the present invention. As shown in FIG. 1, a map display device 20 according to an embodiment of the present invention is connected to a map distribution server 30 via a network 12 and constitutes a communication type map display system 10.

  The map distribution server 30 shown in FIG. 1 includes a map database 31. When there is a request for acquiring map data by designating a desired point or POI (location of interest) from the map display device 20, the map distribution server 30 refers to the map database 31. Map search. And it has the general map delivery service function which transmits the map data obtained as a result of map search to the map display apparatus 20.

  The map database 31 stores vector map data composed of mesh unit map data divided by a predetermined latitude range and longitude range, and reads out the requested map data from the map display device 20 and requests it. Delivered to the original map display device 20. Generally, map data for nine unit maps corresponding to meshes in the vertical, horizontal, and diagonal directions is distributed around the current position of the map display device 20. When the map display device 20 moves and the map data is insufficient, the map distribution server 30 determines the moving direction of the map display device 20 and distributes the insufficient unit map data.

  The map distribution server 30 may be a route search server having a navigation function as well as simply distributing map data to the map display device 20. In this case, the map display device 20 may be a portable terminal device such as an in-vehicle navigation terminal or a mobile phone provided with a navigation application that receives a navigation service. The map distribution server 30 searches for a route from the departure point to the destination with reference to the network database for route search. As such a route search method, a method called label determination method or Dijkstra method is used. Such a configuration is the same as that of a general navigation system.

  As shown in FIG. 1, the map display device 20 includes a control unit 201, a communication unit 202, a position acquisition unit 203, a display unit 204, an operation input unit 205, a distribution request unit 206, a map data storage unit 207, and a position calculation unit 208. , Position comparison means 209, position data storage means 210 and the like.

  In the map display device 20, the control means 201 is a microprocessor having a RAM, a ROM, and a processor (not shown), and controls the operation of each unit by a control program stored in the ROM. The communication unit 202 is an interface for transmitting and receiving communication data with the map distribution server 30 and the like via the network 12.

  The position acquisition means 203 acquires position information by satellite navigation means that receives a signal from a GPS satellite and measures the current position of the map display device 20 using latitude and longitude. The acquired position information (latitude, longitude) is stored in the position data storage unit 210 and used as position data of a base point or used to calculate a virtual current location, as will be described later. Moreover, it is transmitted to the map distribution server 30 and can be used when searching map data, displaying map data, and specifying the current position.

  The display means 204 is composed of a liquid crystal display unit or the like, and displays a map delivered from the map delivery server 30. Further, a menu screen for operating the map display device 20 is displayed on the display means 204, and search conditions and the like can be selected by operating a pull-down menu or the like. Accordingly, the display unit 204 also functions as a part of the operation input unit 205.

  The operation input means 205 is for operation and input consisting of numeric keys, alphabet keys, other function keys, selection keys, scroll keys (up / down / left / right arrow keys), and the like. A desired menu is selected from the displayed menu screen, or various input operations such as setting a virtual base point (initial position) are performed by operating keys.

  The distribution request unit 206 transmits the distribution request edited based on the map display condition set by the operation of the menu screen displayed on the operation input unit 205 or the display unit 204 to the map distribution server 30 via the communication unit 202. To do. When the map display system 10 has a navigation function, a route search condition designated by the operation input unit 205 is also transmitted to the map distribution server 30.

  The map data storage unit 207 is a memory for temporarily storing map data distributed from the map distribution server 30, and the data stored in the map data storage unit 207 is read out as necessary and displayed on the display unit 24. Is displayed. In addition, when the map display system 10 has a navigation function, data such as guide route data distributed from the map distribution server 30 and landmarks on the map are also stored.

  Upon receiving the map data, the map display device 20 stores it in a predetermined memory area of the map data storage means 207 and displays a map centered on the current position or the virtual current position on the display means 204. At this time, the current position mark or the virtual current position mark is displayed superimposed on the map.

  The position calculation means 208 is a processing unit for calculating a virtual current location according to the present invention. The position calculation means 208 includes the latitude and longitude of the current position of the map display device 20 acquired by the position acquisition means 203 at predetermined time intervals, the latitude of the base point and the virtual base point stored in the position data storage means 210, Based on the longitude, the latitude and longitude of the virtual current location are calculated.

  The position comparison unit 209 is a processing unit that determines whether or not to replace the base position according to the present invention, and replaces the previous current location and the virtual current location as the base points as necessary. The position comparison means 209 compares the latitude of the base point stored in the position data storage means 210 with the latitude of the current position of the map display device 20 acquired by the position acquisition means 203, and the difference in latitude is a predetermined value. In the case above, the previous current location and the virtual current location are replaced as the base points.

  The position data storage means 210 is a memory for storing the base point and virtual base point position (latitude, longitude) data and the like according to the present invention. In the position data storage unit 210, the position acquisition unit 23 acquires the latitude and longitude of the current position of the map display device 20, and stores the position data using this as a base point. Further, in order to display the user's movement on a map at another point, an initial position is set on the map, and the position data is stored as a virtual base point.

  FIG. 3 is a diagram illustrating an example of the display screen of the map display device according to the embodiment of the present invention, and is a diagram illustrating an example of displaying the movement of the user on the map. FIG. 3A shows the state of the movement of the user from point A to point A1, and FIG. 3B shows the movement of the user shown in FIG. It is displayed as a movement from the virtual point A ′ to the virtual point 1 ′.

  As shown in FIG. 3A, when a map is displayed on the display unit 204, in general, a constant scale including a current position (point A1) of the map display device 20 acquired by the position acquisition unit 203 is constant. The moving route and a mark indicating the current position of the map display device 20 are superimposed on the map in the range, and the current position mark is displayed at the center of the display screen. When the map display system 10 has a navigation function, the acquired position information includes an error. Therefore, when the current position deviates from the guide route, a route matching process for correcting the current position on the guide route is performed. Done.

  In addition, as shown in FIG. 3B, for example, when the movement of a user who is actually moving in any place in Japan is displayed on a map of another point (for example, the actual United States or Europe). First, an initial position is set on a map to be converted and displayed, and this is set as a virtual base point (point A ′). Next, the user's current position (latitude, longitude) is acquired by the position acquisition means 203, and this is used as the base point (point A).

  Further, calculation processing for converting the position information acquired at predetermined time intervals by the position acquisition unit 203 at a predetermined time interval as the user moves into the virtual current location (point A1 ′) by the position calculation unit 208 as the current position (point A1). The virtual current location mark is obtained by superimposing a virtual movement route and a mark indicating the virtual current location on a map of a certain scale and a certain range including the virtual current location (point A1 ′) obtained by the calculation process. Display so that it is at the center of the display screen.

  Next, a method for calculating the latitude and longitude of the virtual current location in the present embodiment will be described with reference to FIGS. 4 and 5 are schematic diagrams for explaining a method of calculating a virtual current location according to the embodiment of the present invention.

The virtual current location (point A1 ′) can be calculated by the following formula based on the latitude and longitude of the current position (point A1) of the user. That is,
The latitude and longitude of the base point (point A) are (lat, lon),
The latitude and longitude of the virtual base point (point A ′) are (lat ′, lon ′),
The latitude and longitude of the current position (point A1) are (lat1, lon1),
The latitude and longitude of the virtual current location (point A1 ′) are (lat1 ′, lon1 ′),
Then, the difference between the latitude and longitude of the current position from the base point can be expressed by the following equations (Equation 1), respectively.

  When this is converted into a movement amount from the virtual base point in the virtual current location, the difference between the latitude and longitude is expressed by the following equation (Equation 2) in consideration of the longitude interval by latitude.

  Here, the calculation method of the above formula (1) in consideration of the longitude interval by latitude will be described with reference to FIG. Since the distance from the longitude c to the longitude d at the latitude a is represented by lon_a and the distance from the longitude c to the longitude d at the latitude b is represented by lon_b, the following equation (Equation 3) holds for these two ratios. .

  For this reason, lon_a is expressed by the following equation (Equation 4).

  Therefore, in order to make the longitude difference lon_a at the latitude a and the longitude difference lon_b at the longitude b the same distance, it is necessary to correct by multiplying the longitude difference at the longitude b by cosb / cosa which is the reciprocal thereof. is there.

  FIG. 5 is a diagram simply showing a portion for converting the movement from the base point A to the current location A1 shown in FIG. 3 into a virtual movement based on the above concept. Based on FIG. 4, the longitude change amount dif_lon ′ from the virtual base point A ′ to the virtual current location A1 ′ can be expressed by the following equation (Equation 5) in consideration of the latitude.

Here, (lat + lat1) / 2 and (lat ′ + lat1 ′) / 2 mean that the latitudes from the base point A to the current location A1 and from the virtual base point A ′ to the virtual current location A1 ′ are averaged. The above formula (1) is derived as described above.
As a result, the latitude and longitude of the virtual current location are expressed by the following equation (Equation 6).

  As described above, the latitude and longitude of the virtual current location can be accurately calculated from the base point, the virtual base point, and the current position. When the user continues to move, the latitude and longitude of the current location are acquired after a predetermined time by the position acquisition unit 203 of the map display device 20, and the position calculation unit 208 acquires the current position newly acquired for the base point and the virtual base point. The virtual current location is calculated from the latitude and longitude.

  Here, since the latitude (lat) value as the base point is used to calculate the longitude (lon1 ′) of the virtual current location, the user continues to move from the base point to the current location by keeping the base point fixed. If the latitude difference increases, this calculation result (conversion correction) will not be correct. Therefore, it is necessary to sequentially replace the base point with the current location. However, if the base point is replaced with the current location immediately before each calculation, the error appears to be small by one calculation, but it is proportional to the number of position updates (ie, the number of times the virtual current location is calculated) depending on the accuracy of the GPS and the distance traveled. Errors will accumulate.

  For this reason, in the embodiment of the present invention, only when the latitude of the base point and the latitude of the current location become larger than a predetermined value by the position comparison unit 209, the base point is replaced with the latitude and longitude of the previous current location. Replace the virtual base point with the previous virtual current location. As a result, it is possible to prevent an increase in error due to averaging the longitudes of the current location A1 from the base point A and the virtual current location A1 ′ from the virtual base point A ′.

  The map display device 20 performs the above-described calculation processing by the position calculation means 208 and displays the result (virtual current location) obtained thereby together with the map acquired from the map database 31 on the display means 204.

  FIG. 2 is a flowchart showing a map display operation procedure in the map display device according to the embodiment of the present invention. The operation procedure shown in FIG. 2 is realized by the control means 201 of the map display device 20 executing a control program stored in the ROM.

  First, in step S401, the control unit 201 sets a virtual current location (virtual base point A ′) as an initial position. As a method for setting the virtual current location, an input screen is displayed on the display means 204, and a point name such as a facility name, an address or a telephone number, latitude, longitude, etc. is input by free word input using the operation input means 205. Alternatively, a method may be used in which a map is displayed on the display unit 204 and a point is specified on the displayed map to convert it into latitude and longitude information. The base position information of the virtual current location set by the operation input unit 205 and the display unit 204 is stored in the position data storage unit 210.

  Next, in the process of step S402, the position acquisition unit 203 acquires latitude and longitude with the current position (point A1) as the current location. The acquired location information of the current location is stored in the location data storage unit 210.

  In step S403, the control unit 201 determines whether or not the position of the base point for the conversion calculation process is set. If the position of the base point is not set, the process proceeds to step S404, the latitude and longitude of the current location acquired in step S202 are set as the base point (base point A), and the process proceeds to step S405. The set base point information is stored in the position data storage unit 210. On the other hand, if the position of the base point is set, the process proceeds to step S405.

  In the process of step S405, the position comparison unit 209 determines whether or not the difference between the latitude at the base point A and the latitude at the current position A1 is greater than or equal to a predetermined value. If it is greater than or equal to the predetermined value, the process advances to step S406 to replace the base point and the virtual base point. The base point to be replaced may be the position immediately before or a position before a predetermined time may be used. On the other hand, if it is not greater than the predetermined value, the process proceeds to step S407.

  In step S407, the position calculation unit 208 calculates a virtual current position A1 ′ from the base point A, the current position A1, and the virtual base point A ′. Further, in step S408, the control unit 201 displays the virtual current position A1 ′ on the display unit 204 together with the map acquired from the map database 31 and stored in the map data storage unit 207.

  Next, in the process of step S409, the control unit 201 confirms whether or not there is an end instruction from the operation input unit 205. If there is no end instruction, the process returns to step S402 to continue the process. On the other hand, if there is an end instruction, the process ends.

  In the above embodiment, the communication type map display system including the map display device and the map distribution server has been described. However, the present invention is not limited to this, and the map display device can be used as long as the update of the map data can be managed. The present invention may be applied when the map data is downloaded to a portable information device that operates in a stand-alone manner and the map distribution server and the map is displayed on the portable information terminal alone.

  Moreover, although the said Example demonstrated the case where the map was displayed as a virtual present location on the map of the real other countries etc. different from a user's present location, this invention is not limited to this, CG etc. The virtual space may be displayed with the point on the nonexistent virtual space configured by the virtual current location.

  As described above in detail, according to the virtual position display system according to the present invention, the movement of the current position is converted into movement on another map while suppressing an error, thereby virtually experiencing a sense of distance of movement. And can be used for field tests in places that are difficult for users to visit.

It is a block diagram which shows the structure of the map display system concerning the Example of this invention. It is a flowchart which shows the operation | movement procedure of the map display in the map display apparatus concerning the Example of this invention. It is a figure which shows an example of the display screen of the map display apparatus concerning the Example of this invention. It is a schematic diagram for demonstrating the calculation method of the virtual present location concerning the Example of this invention. It is a schematic diagram for demonstrating the calculation method of the virtual present location concerning the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Map display system 12 ... Network 20 ... Map display device 201 ... Control means 202 ... Communication means 203 ... Position acquisition means 204 ... Display Means 205 ··· Operation input means 206 ··· Distribution request means 207 ··· Map data storage means 208 ··· Position calculation means 209 ··· Position comparison means 210 ··· Position data storage Means 30 ... Map distribution server 31 ... Map database

Claims (6)

A virtual position display system that virtually represents movement and position in real space as movement and position at a point different from real space,
A map database storing map information representing points different from the real space;
Position acquisition means for acquiring position information of the current location in real space;
Position calculating means for calculating the position of a virtual current location that is virtually represented corresponding to the current location in real space;
Display means for displaying the virtual current location calculated by the position calculation means together with the map information acquired from the map database;
With
The position calculating means uses an initial position at a point different from the real space as a virtual base point, and uses a desired current position as a base point in a real space in which the position acquisition means acquires position information in association with the virtual base point, A virtual position display system, wherein a virtual current location is calculated based on the virtual base point, the base point, and position information acquired by the position acquisition means at predetermined time intervals.   When the position acquisition means acquires position information of the current location at predetermined time intervals, the latitude included in the position information is compared with the latitude of the base point, and the difference in latitude is greater than or equal to a predetermined value. 2. The virtual position display system according to claim 1, further comprising: a position comparison unit that replaces the current location acquired last time by the location acquisition unit and the corresponding virtual current location as a base point and a virtual base point, respectively. In a virtual position display method for virtually representing movement and position in real space as movement and position at a point different from real space,
A first step in which an initial position at a point different from the real space is a virtual base point;
A second step using a desired current location as a base point in a current location in a real space in which position acquisition means acquires position information in association with the virtual base point;
A third step of acquiring position information of the current location in the real space by the positioning means at predetermined time intervals;
A fourth step of calculating and displaying a virtual current location based on the virtual base point, the base point, and position information acquired by the position acquisition means at predetermined time intervals;
A virtual position display method characterized by comprising:   In the third step, when the position acquisition unit acquires position information of the current location at predetermined time intervals, the latitude included in the position information is compared with the latitude of the base point, and a difference in latitude is determined. 4. The virtual position display according to claim 3, further comprising the step of replacing the current location acquired last time by the location acquisition unit and the virtual current location corresponding to the current location with a base point and a virtual base point, respectively, when the value is greater than or equal to Method. A display terminal device that virtually represents movement and position in real space as movement and position at a point different from real space,
Position acquisition means for acquiring position information of the current location in real space;
Position calculating means for calculating the position of a virtual current location that is virtually represented corresponding to the current location in real space;
Display means for displaying the virtual current location calculated by the position calculation means together with the map information acquired from the map database;
With
The position calculating means uses an initial position at a point different from the real space as a virtual base point, and uses a desired current position as a base point in a real space in which the position acquisition means acquires position information in association with the virtual base point, A virtual terminal location is calculated based on the virtual base point, the base point, and position information acquired by the position acquisition means at predetermined time intervals.   When the position acquisition means acquires position information of the current location at predetermined time intervals, the latitude included in the position information is compared with the latitude of the base point, and the difference in latitude is greater than or equal to a predetermined value. The display terminal device according to claim 5, further comprising: a position comparison unit that replaces the current location acquired last time by the location acquisition unit and the corresponding virtual current location as a base point and a virtual base point.

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