JP2003018643A - Method, device and program for displaying position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for displaying a position capable of efficiently displaying a state of detecting position or behaviors of a moving object to effectively support a moving object position displaying system by wireless. SOLUTION: A moving device carried with the moving object is captured by any one of a plurality of reference devices used as reference of position detection, and a detecting signal for the moving object is generated on the basis of the plurality of reference devices. The position of the captured moving object is displayed on a displaying means by icon. The state of the position detection of the moving object is judged on the basis of the detected signal generated by the plurality of reference devices, and a display form of the icon is changed according to the result of judging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position display method and apparatus suitable for a mobile body position display system by wireless communication.

[0002]

2. Description of the Related Art As a means for detecting the position of a moving body such as a car, train, or pedestrian, GPS (Global Po
sitioning System), PHS (Personal Handyphone Syst)
em), a wireless tag system, etc. are known. The detected position of the moving body needs to be presented to the user (observer) who needs it. As a method, conventionally, coordinate information or the like corresponding to the position of the moving body is displayed or voiced as a character string, or the moving space is virtually set on the screen, and the actual position of the moving body is set to the moving space. A visual image such as an icon is displayed in association with the above virtual position.

With the former position display method, although the user can obtain relatively accurate information, it is not easy to intuitively grasp the position. Therefore, the latter position display method is generally used. It is used a lot.

As a means for detecting the position of a moving body, there is known a means for detecting the position by means of information communication between a reference device serving as a position detecting reference and a mobile device which is attached to the moving body.

In general, since the mobile device and the reference device are physically separated from each other, information is exchanged wirelessly, and inevitably the reliability of information such as omission and loss of information are likely to occur depending on the situation between both devices. This means that the position of the moving body cannot be detected or the obtained position is less likely to be compromised.

In the case where the position of the moving body cannot be detected due to some obstacle or the reliability of the information regarding the detected position is low, the conventional moving body position display system should appropriately grasp the moving body in consideration of these points. There is a demand for making it easy for users.

Further, the conventional mobile body position display system is
This is only for displaying the position of the moving body temporarily, and the user cannot grasp the behavior of the moving body (whether moving or stopped, etc.) just by looking at the displayed contents. There is a problem that it takes time and effort to continuously monitor the display contents in order to confirm the behavior of the moving body.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can effectively display the position detection state and behavior of a moving body, and a moving body position display system by wireless communication is effective. It is an object of the present invention to provide a position display method and device that support the above.

[0009]

In order to solve the above problems and achieve the object, the present invention is constructed as follows.

The position display method according to the present invention includes a capturing step of capturing a mobile device that is attached to a mobile body by one of a plurality of reference devices serving as a reference for position detection.
A signal generating step of generating a detection signal of the moving body captured in the capturing step by the plurality of reference devices, and the capturing step based on the detection signals generated by the plurality of reference devices in the signal generating step A position detection state determining step of determining the position detection state of the moving body captured in step 1, and determining a display mode of the icon indicating the moving body according to the position detection state determined in the position detection state determining step. It is characterized by comprising one display mode determining step and a display step of displaying the icon of the moving object in the display mode determined in the first display mode determining step.

The position display method according to the present invention includes a capturing step of capturing a mobile device attached to a mobile body by one of a plurality of reference devices serving as a reference for position detection.
A signal generation step of generating a detection signal for the moving body captured in the capturing step by the plurality of reference devices, and a behavior of the moving body captured in the capturing step, a time series generated by the signal generating step. Behavior determining step of determining based on a dynamic detection signal, a second display aspect determining step of determining a display aspect of the icon according to the behavior determined in the behavior determining step, and the second display aspect determining A display step of displaying the icon of the moving object in the display mode determined in step.

A position display apparatus according to the present invention captures a moving device that is attached to a moving body by any one of a plurality of reference devices serving as a position detection reference to obtain a detection signal,
In a position display device that displays the position of the moving body based on the detection signal obtained from the reference device on the display means by an icon, the state of position detection of the moving body is detected by the detection signals obtained from the plurality of reference devices. And a display processing unit configured to display the icon on the display unit by changing the display mode of the icon according to the determined position detection state. .

A position display device according to the present invention captures a moving device that is attached to a moving body by any one of a plurality of reference devices serving as a position detection reference to obtain a detection signal,
In a position display device for displaying the position of the moving body based on a detection signal obtained from the reference device on a display means by an icon, the behavior of the moving body is detected in time series from the plurality of reference devices. It is characterized by further comprising: a behavior determination means that determines based on a signal; and a display processing means that causes the display means to display a different display mode of the icon according to the determined behavior.

According to the program of the present invention, a mobile device that is attached to a mobile body is captured by any one of a plurality of reference devices serving as a reference for position detection to obtain a detection signal, and the detection obtained from the reference device is detected. In a position display program applied to a moving body position display system for displaying the position of the moving body based on a signal on a display means, a detection signal indicating the state of detecting the position of the moving body from the plurality of reference devices. And a position display program for causing a computer to function as a display processing unit that causes the display unit to display a different display mode of the icon according to the determined position detection state. Is.

A program according to the present invention captures a moving device that is attached to a moving body by any one of a plurality of reference devices serving as a position detection reference, obtains a detection signal, and performs detection obtained from the reference device. In a position display program applied to a mobile body position display system that displays the position of the mobile body based on a signal on a display means, the behavior of the mobile body is displayed in a time-series manner obtained from the plurality of reference devices. And a position display program for causing a computer to function as display processing means for displaying the behavior on the display means by changing the display mode of the icon according to the determined behavior.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the schematic arrangement of a mobile unit position display system according to the first embodiment of the present invention.

In the figure, reference numeral 7 denotes a moving body (for example, "person") to be detected, and 8 denotes a mobile device carried (attached) by the moving body 7. Also, 2a-
Reference numeral 2c indicates a plurality of reference devices serving as a reference for detecting the position of the mobile device 8 by wireless communication, and each reference device is composed of a wireless base station. The mobile body position display system 1 of the present embodiment is connected to these reference devices 2a to 2c via a communication network N, and a detection signal processing unit 3, a display processing unit 4, a mobile body position data 5, and map data. The reference device position data 6 and the like, and the display unit 9. The reference devices 2a to 2c
The entire configuration including the communication network N and the mobile body position display system 1 may be used. In addition, the reference device 2
Although a to 2c are set at three locations for convenience of description, they may be provided only at one location or at multiple locations of three or more locations depending on the embodiment.

The moving body position display system 1 of the present embodiment as described above detects the position of the moving device 8 attached to the moving body 7 by the plurality of reference devices 2a to 2c, and the detected position of the moving body 7 is detected. The position is displayed on the display unit 9.

The reference devices 2a to 2c capture radio waves transmitted by one or a plurality of mobile devices 8, generate detection signals from the results, and transmit the mobile body position display system 1 of the present embodiment via the communication network N. To the detection signal processing unit 3. Such detection signal includes a pair of an ID identifying the mobile device 8 and an ID identifying the reference device 2n.

The detection signal processing unit 3 classifies the detection signals received from the plurality of reference devices 2a to 2c for each moving body 7, and generates and stores moving body position data 5. On this occasion,
When a moving device 8 is captured by only one reference device (any of 2a to 2c), the position of the reference device (or its vicinity) is set as the position of the moving body 7. On the other hand, when the same mobile device 8 is simultaneously captured by a plurality of geographically adjacent reference devices 2, the position of the moving body 7 is appropriately determined based on the positional relationship between the captured reference devices. To do.

As another example of the configuration for detecting the position of the mobile device 8, the mobile device 8 captures radio waves transmitted from a plurality of reference devices 2a to 2c, such as GPS, to obtain the mobile body position data 5. It may be configured to generate. In addition, carriers other than radio waves (eg infrared rays or light) may be used.

The display processing unit 4 processes map data and reference device position data 6 corresponding geographically to the moving range of the moving body 7, and a moving body position display icon based on the moving body position data 5, A position display screen of the moving body 7 is generated and displayed on the display unit 9.

FIG. 2 is a flowchart showing the operation of the moving body position display system according to this embodiment.

First, when the processing is started in STEP 1, the detection signal processing unit 3 performs the position detection processing of the moving body (STEP 2).
That is, the detection signal processing unit 3 includes a plurality of reference devices 2a to 2a.
Collect the capture information of the mobile device 8 from c. As the concrete contents of the processing here, first, reference devices 2a to
2c to receive capture information for multiple mobile devices 8. Then, the captured information received for each of the reference devices is sorted and classified for each mobile device 8, and the current position of each mobile device 8 is calculated. The obtained calculation result is written in the storage means such as a memory or a magnetic disk as the moving body position data 5. The moving body position data 5 comprises a set of time, position and position detection state (described later) for each moving device 8 and is stored in time series.

When the current position is calculated for each mobile device 8, the detection signal processing section 3 executes the detection state determination processing in STEP3. In the detection state determination processing, each mobile device 8 is based on the result of the mobile body position detection processing performed in STEP 2.
The position detection state of is determined. In particular, in the present embodiment, it is determined which of the three state types the state related to the position detection of the mobile device 8 is defined by the “fixed state”, the “position indeterminate state” and the “unknown position”. To do.

The "position-determined state" means a state in which the position detection result of the mobile device 8 is certain. Specifically, it is a state in which only one reference device (one of 2a to 2c) captures the mobile device 8.

The "position indeterminate state" means a state in which the position detection result of the mobile device 8 is uncertain. That is, for example, when a plurality of reference devices have captured the mobile device 8. For example, the moving device 8 is moving at a relatively high speed, and the moving device 8 is captured by all of the reference devices 2a to 2c.

The "position unknown state" means a state in which the position of the mobile device 8 cannot be detected. This state occurs when the mobile device 8 moves to a place where the reference device does not exist. This is the case when the mobile device 8 is not within the capture area of any reference device.

The determination result of the state related to the position detection of the mobile device 8 is additionally held in a predetermined area as a data element of the mobile body position data 5.

Next, in STEP 4 and subsequent steps, the processing for displaying the position of the moving body on the map is performed according to the determination result in STEP 3. In this process, as shown in FIG. 8, the display processing unit 4 first reads the map data 6 and displays the map (image) M on the display screen of the display unit 9.

Next, at an appropriate position on the map M, an icon I (referred to as "moving body icon") indicating the location of the moving body 7 attached to the moving device 8 is displayed. The display position of the moving body icon I is determined based on the moving body position data 5. In FIG. 8, D1 and D2 are icons of reference devices whose positions on the map M are known, and R1 and R2 indicate capture ranges of the reference devices D1 and D2, respectively. Note that it is not always necessary to display D1 and D2, R1 and R2 on the map M. Further, FIG. 9 shows a display example when the position of the moving body is detected by the two reference devices. In this case, the capture range R1 of the reference device D1 and the reference device D
The overlapping portion of the capture range R2 of 2 is the detection position of the moving body. In this case, the capture range R1 and the capture range R2 shown in FIG.
The position detection result may be handled so that if the overlapping range is sufficiently small, the position is determined, and if the overlapping range is large, the position is not determined.

If the determination result in STEP 3 is the position confirmation state, the display processing unit 4 displays the confirmation state display processing (STEP
Perform 5). That is, as shown in FIG. 3A, the moving body icon I1 is continuously displayed.

On the other hand, when the determination result in STEP 3 is the position indeterminate state, the display processing unit 4 performs the indeterminate state displaying process (STEP 6). That is, as shown in FIG. 3B, first, at the first display timing, the moving body icon I1 is displayed.
Is displayed, the display of the moving body icon I1 is turned off at the subsequent second display timing, and the moving body icon I1 is displayed again at the third display timing. The display of such an icon blinks repeatedly (flashing display at short intervals). In the figure, for convenience of explanation, the non-display of the moving body icon I1 is shown by a dotted line, but it is not hidden and the icon image I2 distinguishable from the moving body icon I1 in the fixed state is displayed here. You may let me.

If the result of determination in STEP 3 is the position unknown state, the display processing unit 4 performs an unknown state display process (STEP 7). That is, as shown in FIG. 3C, the moving body icon I1 is first displayed at the first display timing.
Is displayed, the display of the moving body icon I1 is turned off at the subsequent second display timing, and the display of the moving body icon I1 is turned off also at the third display timing.
Then, at the fourth display timing, the moving body icon I1 is displayed again. The display blinking of such an icon is repeated (a blinking display at intervals of a long time).

The display position of the moving body icon I1 in this case is provided with a display area for displaying a moving device in an unknown state, and the moving body icon I1 is displayed in the area.
1 is displayed. Alternatively, the moving body icon I1 may be displayed at the position displayed as the "position-fixed state" or the "position-unfixed state" until just before it becomes unknown.

In the subsequent STEP 8, the end judgment is made,
If the user or the like issues an end instruction, the position display process ends (STEP 9). When the position display process is not finished (STEP8 = No), the process returns to STEP2 and the process from the moving object position detection is repeated.

It should be noted that the changes in the three display modes of the position-determined state, the position-undetermined state, and the position-unknown state may be realized by another method. For example, as shown in FIG. 4, a confirmed state S1, an uncertain state S2, and an unknown state S3.
The color of the mobile object icon becomes lighter in this order, and it approaches white. That is, the same effect may be obtained by changing the saturation of the icon display color. In the drawings, this is shown by the dense hatching for the sake of convenience.

Alternatively, as shown in FIG.
The same effect may be obtained by increasing the display transparency of the mobile object icon in the order of 1, the uncertain state O2, and the unknown state O3. As can be seen from the figure, in the unknown state O3, the display transparency is higher than in the confirmed state O1, and the difference from the background B is smaller. Therefore, the presence of the moving body icon becomes weaker in the order of the confirmed state, the uncertain state, and the unknown state, and an intuitive display effect can be obtained.

According to the first embodiment described above, the display mode is changed according to the position detection state (position determination, position indetermination, position unknown) of the moving body 7 by the plurality of reference devices 2a to 2c. Specifically, since the continuous display of the moving body icon, blinking at short intervals, and blinking at long intervals are switched, the position of the moving body 7 is considered while the user considers the accuracy of the information. Be able to make an appropriate decision regarding.

[Second Embodiment] Next, a second embodiment of the present invention will be described. The hardware configuration of the second embodiment may be the same as that of the first embodiment. FIG. 6 is a flowchart showing the flow of the position display process according to the second embodiment. In this flowchart, the processing from STEP 11 to STEP 13 is the same as STEP 1 to STEP of the first embodiment.
This is the same as the processing up to 3.

First, when the processing is started in STEP 11, the detection signal processing unit 3 performs the position detection processing of the moving body (STEP 1
2). That is, the detection signal processing unit 3 includes a plurality of reference devices 2
Collect capture information of the mobile device 8 from a-2c. As the concrete contents of the processing here, first, the capture information regarding the plurality of mobile devices 8 is received from each of the reference devices 2a to 2c. Then, the captured information received for each of the reference devices is sorted and classified for each mobile device 8, and the current position of each mobile device 8 is calculated.
The obtained calculation result is written in the storage means such as a memory or a magnetic disk as the moving body position data 5. The moving body position data 5 comprises a set of time, position and position detection state (described later) for each moving device 8 and is stored in time series.

When the current position is calculated for each mobile device 8, the detection signal processing section 3 executes the detection state determination processing in STEP13. In the detection state determination process, the position detection state of each mobile device 8 is determined based on the result of the moving body position detection process performed in STEP 12. In particular, in this embodiment, the state related to the position detection of the mobile device 8 is the “fixed state”,
It is determined which one of the three state types defined by the “position indeterminate state” and the “position unknown state”.

The determined "position-determined state", "position-undetermined state", and "position-unknown state" are treated as the same information as in the first embodiment, and added to a predetermined area as data elements of the mobile unit position data 5. Retained.

When the detection state determination processing in STEP 13 is completed, the detection signal processing unit 3 performs the behavior determination processing (STEP 14).
I do. In this behavior determination process, the state relating to the behavior of each mobile device 8 is referred to by the mobile body position data 5 and which of the three state types is defined by “retained”, “moving” and “unknown behavior”. Estimate if you are in a state. First, when the position of the mobile device 8 has not changed for a predetermined time or longer, the behavior of the mobile device 8 is estimated to be “in residence”. When the position of the mobile device 8 changes every moment, the behavior of the mobile device 8 is estimated to be “moving”. If the behavior cannot be determined due to the position of the mobile device 8 being in an unknown state, the behavior of the mobile device 8 is set to “behavior unknown”.

When the determination result in STEP 14 is the state of "dwelling", the display processing unit 4 performs a staying state display process (STEP 16). That is, as shown in FIG. 7A, the moving body icons I are continuously displayed.

If the determination result in STEP 14 is "moving", the display processing unit 4 performs a moving state display process (STEP 17) in STEP 17. That is, FIG.
As shown in (b), first, the moving body icon I1 is displayed at the first display timing, the moving body icon I1 is turned off at the subsequent second display timing, and the moving body icon I1 is displayed again at the third display timing. The icon I1 is displayed. The display of such an icon blinks repeatedly (flashing display at short intervals). In the figure, for convenience of explanation, the non-display of the moving body icon I1 is shown by a dotted line. However, the non-displaying is not performed here, and the distinguishable icon image I2 is displayed for the moving body icon I1 in the staying state. May be.

If the determination result in STEP 14 is the behavior unknown state, the display processing unit 4 performs the behavior unknown state display processing (STEP 18). That is, as shown in FIG. 7C, first, the moving body icon I1 is displayed at the first display timing, then the moving body icon I1 is turned off at the subsequent second display timing, and then the third display timing is displayed. Also, the display of the moving body icon I1 is turned off, and the moving body icon I1 is displayed again at the fourth display timing. The display blinking of such an icon is repeated (a blinking display at intervals of a long time).

In the subsequent STEP 19, the end determination is performed, and if the user or the like issues an end instruction, the position display processing is ended (STEP 20). When the position display process is not finished (STEP 19 = No), the process returns to STEP 12 and the process from the moving object position detection is repeated.

As described above, in the second embodiment, the behavior of the moving body 7 is estimated, and the display mode of the moving body icon is changed according to the estimation result. Therefore, the user can easily recognize the behavior of the moving body 7 (that is, the positional change with time), and the user does not have to keep monitoring the screen to grasp the behavior of the moving body 7.

The display modes of the "retained state", "moving state" and "unknown behavior" are not limited to those described above. For example, the moving body icon is displayed statically in the staying state, the moving body icon vibrates in the moving state, and the moving body icon repeatedly contracts in the behavior unknown state. The visual effect of is obtained.

Further, the display mode may be changed according to the position detection state determined in STEP 13 and the behavior state determined in STEP 14. In this case, the display becomes slightly complicated, but the state of the moving body 7 can be grasped more accurately.

Furthermore, it is also effective to change the display form of the moving body icon depending on the attribute of the moving body 7 in addition to the state and behavior related to the position detection of the moving body 7. For example, if the moving body 7 is a pedestrian, the moving body 7 is provided with an attribute for identifying “child and adult”, “family and couple”, “guest, general person and staff”, etc. It is preferable that the display mode according to the above-described embodiment is changed according to the attribute because a more appropriate and flexible display function can be realized.

[0054]

As described above, according to the present invention, the position display method and device capable of effectively displaying the position detection state and behavior of the mobile body and effectively supporting the mobile body position display system by wireless communication. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a moving body position display system according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the moving body position display system according to the first embodiment.

3A and 3B are diagrams showing a display mode of a moving body according to a position situation, wherein FIG. 3A is a diagram showing a confirmed state, FIG. 3B is a diagram showing an uncertain state, and FIG. Figure

FIG. 4 is a diagram showing another example of the display mode of the moving body according to the position situation, showing a case where the display saturation is changed.

FIG. 5 is a diagram showing another example of the display mode of the moving body according to the position situation, showing a case where the display transparency is changed.

FIG. 6 is a flowchart showing the operation of the mobile unit position display system according to the second embodiment of the present invention.

7A and 7B are diagrams showing a display mode of a moving body according to estimated behavior, where FIG. 7A is a diagram showing a staying state, FIG. 7B is a diagram showing a moving state, and FIG. Showing

FIG. 8 is a diagram showing an example of a position display of a moving body on a display unit.

FIG. 9 is a diagram showing another example of the position display of the moving body on the display unit, showing the case of the two-vehicle detection method.

[Explanation of symbols]

1 ... Moving object position display system 2a to 2c ... Reference device 3 ... Detection signal processing unit 4 ... Display processing unit 5 ... Mobile position data 6 ... Map data, reference device position data, etc. 7 ... Mobile 8 ... Mobile device 9 ... Display (display) N ... communication network

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideyuki Aisu             1st Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa             Inside the Toshiba Research and Development Center F-term (reference) 5J062 AA08 CC07                 5K067 AA34 BB36 EE02 EE10 FF03                       FF23 HH22 HH23 JJ53

Claims (11)

[Claims] 1. A capture step of capturing a mobile device, which is attached to a mobile body, by any of a plurality of reference devices serving as a reference for position detection, and a plurality of detection signals of the mobile body captured in the capture step. A position detection state for determining the position detection state of the moving body captured in the capturing step, based on the signal generation step generated by the reference device, and the detection signals generated by the plurality of reference devices in the signal generation step. A determination step, a first display mode determination step of determining a display mode of the icon indicating the moving object in accordance with the position detection state determined in the position detection state determination step, and the first display mode determination step A display step of displaying the icon of the moving body in the display mode determined in Position display method characterized by comprising. 2. A capturing step of capturing a mobile device, which is attached to a mobile body, by one of a plurality of reference devices serving as a reference for position detection, and a plurality of detection signals of the mobile body captured in the capturing step. Signal generation step generated by the reference device of, and the behavior of the mobile body captured in the capturing step,
A behavior determination step of determining based on the time-series detection signal generated by the signal generation step, and a second display manner determination of determining the display manner of the icon according to the behavior determined in the behavior determination step A position display method comprising: a step; and a display step of displaying the icon of the moving object in the display mode determined in the second display mode determination step. 3. The position display method according to claim 1, wherein one of the first and second display mode determining steps determines a blinking interval of the icon. 4. The position display method according to claim 1, wherein one of the first and second display mode determining steps determines a display color of the icon. 5. The position display method according to claim 1, wherein at least one of the first and second display mode determining steps determines a display transparency of the icon. 6. The position detection state determining step determines at least one of a position-determined state, a position-indeterminate state, and a position-unknown state as the position-detection state. The position display method described in any of the above. 7. The position display method according to claim 1, wherein the behavior determining step determines at least one of staying and unknown behavior as the behavior of the moving body. 8. A moving device that is attached to a moving body is captured by any one of a plurality of reference devices serving as a reference for position detection to obtain a detection signal, and the movement based on the detection signal obtained from the reference device. In a position display device for displaying the position of the body on the display means by an icon, position detection state determination means for determining the position detection state of the moving body based on detection signals obtained from the plurality of reference devices, And a display processing unit that causes the display unit to display the icon in a different display mode according to the position detection state. 9. A moving device that is attached to a moving body is captured by any one of a plurality of reference devices serving as a position detection reference to obtain a detection signal, and the movement based on the detection signal obtained from the reference device. In a position display device for displaying the position of the body on a display means by an icon, a behavior determination means for determining the behavior of the moving body based on time-series detection signals obtained from the plurality of reference devices is determined. Display processing means for displaying the icon on the display means by changing the display mode of the icon according to the behavior,
A position display device comprising: 10. A moving device that is attached to a moving body is captured by any one of a plurality of reference devices serving as a reference for position detection to obtain a detection signal, and the movement based on the detection signal obtained from the reference device. In a position display program applied to a moving body position display system for displaying the position of a body on a display means by an icon, the state of position detection of the moving body is determined based on detection signals obtained from the plurality of reference devices. Position detection state determination means, a position display program for causing a computer to function as display processing means that causes the display means to display the icons in different display modes according to the determined state of the position detection. 11. A moving device that is attached to a moving body is captured by any one of a plurality of reference devices serving as a position detection reference to obtain a detection signal, and the movement based on the detection signal obtained from the reference device. In a position display program applied to a moving body position display system for displaying the position of a body on a display means by an icon, the behavior of the moving body is based on time-series detection signals obtained from the plurality of reference devices. Behavior determining means for determining, a position display program for causing a computer to function as display processing means for displaying on the display means by changing the display mode of the icon according to the determined behavior.