JP2014078888A - Display device, display method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily grasp a situation of a subscriber terminal for each installation information.SOLUTION: A maintenance center terminal 2 sets a threshold showing a ratio of the number of subscriber terminals 4 in a communication disabled state; searches for and collects connection states of subscriber terminals 4; searches for and collects installation information on the basis of the connection states of the subscriber terminals 4 from an address information provision server 3 for associating address information on the subscriber terminals 4 with information for uniquely identifying the subscriber terminals 4; aggregates connection states for each collected address information on the subscriber terminals 4; calculates a ratio of the number of subscriber terminals 4 in the communication disabled state; and displays address information on the subscriber terminals 4 on a display unit if the calculated ratio is a value satisfying the threshold.

Description

  The present invention relates to a display device, a display method, and a program.

  There is known a system that can display a call state of an extension telephone number that is accommodated by an exchange different from the exchange that accommodates the telephone exchange (for example, Patent Document 1).

  According to the technique disclosed in Patent Document 1, a call status display request signal including a representative extension telephone number and extension telephone number group information of a subscriber exchange to be informed of a call status from a telephone exchange apparatus is subscribed via a relay exchange. To the exchange. Then, the subscriber exchange receiving the call state display request signal sends a call state display change report indicating the call state of each accommodated subscriber terminal to the telephone exchange apparatus that sent the call state display request signal. Thus, the call state of the extension telephone number accommodated in the subscriber exchange can be displayed. With this configuration, when it is desired to check the connection status of the subscriber terminal, the subscriber terminal identifier such as the representative extension telephone number and extension telephone number group information for which the call status is to be known is input from the telephone exchange device. Thus, it is possible to grasp the connection state for each subscriber terminal.

JP-A-11-346264 (summary, etc.)

  However, in the technique disclosed in Patent Document 1, in the event of a large-scale disaster or power outage, in order to confirm the connection status of all the subscriber terminals, the subscriber terminal identifiers are individually input, respectively. It is necessary to confirm. Therefore, how many subscriber terminals are damaged, in which area and which subscriber terminals are damaged, or how much is recovered after the damage occurs It is not possible to easily grasp the overall damage situation and recovery situation such as whether it is progressing.

  Therefore, the present invention solves the above-described problems, that is, a display device and a display method capable of easily grasping a situation according to installation information of a subscriber terminal when a disaster or a power failure occurs, and The purpose is to provide a program.

  In order to solve the above-described problem, one aspect of the present invention relates to a display device. In other words, in a display device that displays information according to the connection state of the subscriber terminal accommodated under the subscriber accommodation device on the display unit, the connection with the subscriber accommodation device cannot be established, making a call impossible. Setting means for setting a threshold value indicating the percentage of subscriber terminals in a certain state, first search collecting means for searching and collecting connection states of subscriber terminals, information for uniquely identifying the subscriber terminals, and subscribers A second search and collecting means for searching and collecting the installation information based on the connection state of the subscriber terminal collected by the first search and collecting means with reference to a storage device associated with the terminal installation information; The connection state of the subscriber terminal is totaled for each installation information of the subscriber terminal collected by the second search and collection means, the connection with the subscriber accommodation device cannot be established, and the telephone call cannot be established. A calculating means for calculating a ratio of subscriber terminals; A display control means for displaying on the display unit installation information of the subscriber terminal the calculated ratio is a value that satisfies the set threshold by setting means by calculation means is a display device having a.

  In the display device of the present invention, in addition to the above configuration, the setting information is information indicating an area where the subscriber terminal is installed or information indicating a subscriber accommodation device in which the subscriber terminal is accommodated. Yes, the display control means is information indicating an area where the ratio calculated by the calculation means is less than or equal to the threshold set by the setting means, or less than or more than the threshold set by the setting means. Information indicating the subscriber accommodation device that is present can be displayed on the display unit.

  In the display device of the present invention, in addition to the above-described configuration, the setting means sets the area to be displayed or the subscriber accommodation device in addition to the threshold value setting, and the calculation means is the second search collection means. The subscriber terminal satisfying the setting condition by the setting means is identified from the information retrieved by the above, and among the identified subscriber terminals, the connection with the subscriber accommodation device cannot be established and the telephone call is not possible The display control means causes the display unit to display information indicating an area where the ratio calculated by the calculating means satisfies the setting condition by the setting means or information indicating the subscriber accommodation device on the display unit. Can do.

  In addition to the above-described configuration, the display device of the present invention cannot display the storage device with respect to the installation information of the subscriber terminal searched by the first search collection unit by the second search collection unit. In this case, information indicating the subscriber terminal searched by the first search means can be displayed on the display unit.

  One aspect of the present invention relates to a display method. That is, in the display method for displaying information according to the connection state of the subscriber terminal accommodated under the subscriber accommodation device on the display unit, the connection with the subscriber accommodation device cannot be established, and the call becomes impossible. A setting step for setting a threshold value indicating the percentage of subscriber terminals in a certain state, a first search and collection step for searching and collecting connection states of subscriber terminals, information for uniquely identifying the subscriber terminals, and subscribers A second search and collection step of searching for and collecting the installation information based on the connection state of the subscriber terminal collected in the first search and collection step with reference to a storage device associated with the installation information of the terminal; The connection state of the subscriber terminal is totaled for each installation information of the subscriber terminal collected in the second search and collection step, and the connection with the subscriber accommodation device cannot be established, and the telephone call cannot be established. Subscriber terminal discount And a display control step of displaying on the display unit installation information of the subscriber terminal whose ratio calculated by the calculation step is a value satisfying the threshold set by the setting step. is there.

  Furthermore, one aspect of the present invention relates to a program. That is, a computer that displays information corresponding to the connection state of the subscriber terminal accommodated under the subscriber accommodation device on the display unit cannot be connected to the subscriber accommodation device, making a call impossible. Setting means for setting a threshold value indicating the percentage of subscriber terminals in a state, first search collecting means for searching and collecting connection states of subscriber terminals, information for uniquely identifying subscriber terminals, and subscriber terminals A second search / collection means for searching and collecting the installation information based on the connection state of the subscriber terminal collected by the first search / collection means with reference to the storage device associated with the installation information of The subscriber terminal connection status is aggregated for each subscriber terminal installation information collected by the second search / collection means, and the subscriber cannot connect with the subscriber accommodation device and cannot make a call. Calculating means for calculating the proportion of the user terminal; Is a program for functioning as display control means for displaying the installation information of the subscriber terminal ratio calculated by means out has a value that satisfies the set threshold by setting means on the display unit.

  ADVANTAGE OF THE INVENTION According to this invention, when a disaster, a power failure, etc. generate | occur | produce, the display apparatus which can grasp | ascertain the condition according to the installation information of a subscriber terminal, a display method, and a program can be provided.

1 is a diagram showing a telephone network system 1 according to a first embodiment of the present invention. It is a block diagram which shows the structure of the function of the maintenance center terminal 2 shown in FIG. It is a flowchart which shows the process which the maintenance center terminal 2 shown in FIG. 1 performs. It is the conceptual diagram which showed the relationship of the communication process with the maintenance center terminal 2, the address information server 3, and the subscriber terminal 4 corresponding to the process demonstrated in FIG. It is a figure which shows the telephone network system 1A which concerns on 2nd Embodiment of this invention. It is the conceptual diagram which showed the relationship of the communication process with the maintenance center terminal 2 and the subscriber terminal 4 in the telephone network system 1A which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structural example of the hardware of a computer.

  Hereinafter, a telephone network system 1 including a maintenance center terminal 2 as a display device according to an embodiment of the present invention will be described with reference to the drawings. The display method and the program according to the embodiment of the present invention will be described by taking the operation of the maintenance center terminal 2 and the program installed in the maintenance center terminal 2 as an example.

[First embodiment]
In the telephone network system 1 according to the first embodiment of the present invention, the connection state of the subscriber terminal 4 can be displayed for each region by the maintenance center terminal 2 installed in the maintenance center. The maintenance center terminal 2 can grasp the connection status of the subscriber terminals 4 by region. Here, the connection state is a state in which the subscriber terminal 4 is turned on and a connection with a subscriber accommodation server (not shown) that accommodates the subscriber terminal 4 is established. Indicates whether or not.

(Configuration of telephone network 1)
The configuration of the telephone network 1 will be described. FIG. 1 is a diagram showing a telephone network system 1 including a maintenance center terminal 2 as a display device according to a first embodiment of the present invention. The telephone network system 1 includes a maintenance center terminal 2, an address information providing server 3, and a subscriber terminal 4. In this embodiment, the maintenance center terminal 2 has a function (to be described later) included in the claimed display device, and a call is established at a predetermined threshold (for example, a subscriber terminal 4 installed in a predetermined area). When the ratio of the number of subscriber terminals that cannot be set is set, an area that satisfies the set threshold value can be displayed on its own display unit (output unit 57 in FIG. 5).

  The maintenance center terminal 2 obtains the connection status of the subscriber terminal 4 by transmitting a search request to a subscriber accommodation server (not shown) by the user's operation, A region that satisfies a predetermined threshold is identified from the address information of the subscriber terminal 4 acquired from the address information providing server 3 and the total number of installed subscriber terminals 4 by region, and the identified region information is displayed. It is a computer that can. Note that the functions and predetermined thresholds of the maintenance center terminal 2 will be described later.

  The address information providing server 3 is a computer that holds address information where the subscriber terminal 4 is installed and can provide information according to a search request from the maintenance center terminal 2. For example, the address information providing server 3 includes a database in which the identifier of the subscriber terminal 4 is associated with the address information where the subscriber terminal 4 is installed, and in response to a search request from the maintenance center terminal 2, Address information associated with the identifier of the terminal 4 can be transmitted to the maintenance center terminal 2.

  The subscriber terminal 4 is, for example, a stationary telephone set installed in an office or the like, and is a device accommodated in a subscriber accommodation server (not shown). The subscriber terminal 4 generates a call signal (a type of call control signal) including dial number information including the telephone number of the subscriber terminal 4 to be a call destination in response to a user's operation. A call can be made to the terminal 4. The subscriber terminal 4 may be a mobile phone in addition to a stationary phone.

  Next, functions of the maintenance center terminal 2 will be described. FIG. 2 is a block diagram showing a functional configuration of the maintenance center terminal 2 shown in FIG. As shown in FIG. 2, the maintenance center terminal 2 includes a control unit 10, a setting unit 11, a search unit 12, an installation information specifying unit 13, and a display determination unit 14.

  The control unit 10 controls various operations of the setting unit 11, the search unit 12, the installation information specifying unit 13, and the display determination unit 14 described later of the maintenance center terminal 2.

  The setting unit 11 sets a threshold relating to the connection state of the subscriber terminal 4 based on a value input by the user operating the maintenance center terminal 2. Here, the threshold value relating to the connection state of the subscriber terminal 4 is a subscriber terminal 4 and a subscriber terminal 4 that is accommodated (not shown) with the number of all subscriber terminals included in a predetermined area as the denominator. The ratio of the number of subscriber terminals in a state where a connection with the subscriber accommodation server is not established (a state in which a call is impossible) is shown.

  When the threshold value is set by the setting unit 11, the search unit 12 searches the connection status of all the subscriber terminals 4 included in the telephone network 1 under the control of the control unit 10. Specifically, the search unit 12 transmits a search request to an unillustrated subscriber accommodation server with information on the identifiers of the subscriber terminals 4 included in the telephone network 1 and the connection status of these subscriber terminals 4. And get.

  The installation information specifying unit 13 is controlled by the control unit 10, and the subscriber terminal 4 in a state in which a call is not possible based on the identifier and connection state information of the subscriber terminal 4 as a result of the search by the search unit 12. Is acquired from the address information providing server 3. As a result, the maintenance center terminal 2 can identify address information (regional information) where the subscriber terminal 4 that is unable to talk is installed.

  Based on the address information specified by the installation information specifying unit 13 under the control of the control unit 10, the display determination unit 14 aggregates the subscriber terminals 4 in a state in which a call is impossible for each region, A ratio with the total number of subscriber terminals is calculated and compared with the threshold value specified by the setting unit 11, and an area satisfying a predetermined condition is displayed on the display unit (the output unit 57 in FIG. 5). The predetermined condition here may be, for example, a condition that the area is a ratio that is equal to or greater than the threshold as a result of aggregation, or an area that is a ratio equal to or less than the threshold or less than the threshold. Any of the conditions may be used.

  FIG. 3 is a flowchart showing display processing executed by the maintenance center terminal 2 shown in FIG. The display process shown in FIG. 3 is executed when the operator operates the maintenance center terminal 2 (START). In the following processing, the total number of installed subscriber terminals 4 for each predetermined area will be described on the assumption that the information can be grasped on the maintenance center terminal 2 side.

  When the value set by the operator is input, the control unit 10 of the maintenance center terminal 2 passes the value to the setting unit 11 and starts the following process (START). The setting unit 11 sets a threshold based on the value passed from the control unit 10 (step S1). When the process of step S1 is completed, the search unit 12 executes a search request for the connection state of the subscriber terminal 4 under the control of the control unit 10 (step S2). The search request in step S2 is transmitted to a subscriber accommodation server (not shown) in which the subscriber terminal 4 is accommodated. When the connection state returned from the subscriber accommodation server (not shown) as a response to the search request in step S2 is a call impossible state, the control unit 10 determines the subscriber based on the identifier information of the subscriber terminal 4. A search request for the address information of the terminal 4 is executed to the address information providing server 3 to collect the address information (step S4). The installation information specifying unit 13 specifies the address information of the subscriber terminal 4 based on the response from the address information providing server 3 under the control of the control unit 10. If it is determined in step S3 that the call cannot be made, the process returns to step S2, and the connection status of the next subscriber terminal 4 is searched. And the display determination part 14 totals the connection state of the subscriber terminal 4 according to address information based on the address information collected by step S4 by control of the control part 10, and a telephone call is impossible. The ratio of the number of subscriber terminals is calculated (step S5). As a result of the calculation process in step S5, the control unit 10 causes the display unit (the output unit 57 in FIG. 7) of the maintenance center terminal 2 to display information that satisfies a predetermined condition for each piece of installation information (step S6), and ends the process. (END). Note that the predetermined condition here means a region that satisfies the above-described threshold value (a region that is equal to or greater than the threshold value or a region that is less than the threshold value).

  FIG. 4 is a conceptual diagram showing the relationship between the maintenance center terminal 2, the address information server 3, and the subscriber terminal 4 corresponding to the processing described in FIG. As shown in FIG. 4, when a threshold value is input from the operator, the maintenance center terminal 2 is a subscriber (not shown) in which each subscriber terminal 4 is accommodated for the connection status of all subscriber terminals 4. Collect through the containment server. When the connection state of the subscriber terminal 4 is in a call-disabled state, the maintenance center terminal 2 inquires the address information server 3 for address information, searches for the address information, stores the collected information, and stores the collected collection. The editing result based on the information is displayed on the screen.

  By executing the processing as described above, for example, when a large-scale disaster occurs, it is possible to display the presence / absence of the damage occurrence status of the subscriber terminal 4 for each region. Alternatively, it is possible to easily grasp the overall damage status and recovery status in units by region regarding the recovery status after the occurrence of damage. Further, even when a power failure occurs due to, for example, lightning, it is possible to easily grasp the overall damage status and recovery status in units by region.

[Second Embodiment]
Subsequently, a second embodiment of the present invention will be described. FIG. 5 is a diagram showing a telephone network system 1A according to the second embodiment of the present invention. In addition, about the thing which has the same function as 1st Embodiment, the same code | symbol is used and description is abbreviate | omitted or simplified. In the telephone network system 1A according to the second embodiment of the present invention, the maintenance center terminal 2 installed in the maintenance center displays the connection status of the subscriber terminals 4 for each of the accommodated subscriber accommodation servers 5. It is. That is, it is possible to grasp the connection state of the subscriber terminal 4 in the unit of the subscriber accommodation server 5 as a unit for displaying. The connection state here indicates whether or not the subscriber terminal 4 is turned on and a connection with the subscriber accommodation server 5 is established.

  FIG. 6 is a conceptual diagram showing the relationship between the maintenance center terminal 2 and the subscriber terminal 4 in the telephone network system 1A according to the second embodiment of the present invention. Even when the status display is performed in units of the subscriber accommodation server 5, the ratio (threshold value) of the subscriber terminals 4 in which the operator has failed is set as in the case of the display by region described in the first embodiment. Note that the process of searching for the connection status of the subscriber terminal 4 executed by the maintenance center terminal 2 performs a search for the subscriber accommodation server 5 in the same manner as the display by region described in the first embodiment. However, for the subscriber terminal 4 that is found to be incapable of calling in the search process, information indicating the subscriber accommodation server 5 in which the subscriber terminal 4 is accommodated (for example, the subscriber accommodation server 5 is stored). A unique identification ID or the like) is saved as collection information, and an editing result based on the saved collection information is displayed on the screen.

  By executing the processing as described above, for example, when a large-scale disaster occurs, it is possible to display the presence / absence of the occurrence of damage in the unit of the subscriber accommodation server 5 that accommodates the subscriber terminal 4, It becomes possible to easily grasp the overall damage status and recovery status in the unit of the subscriber accommodation server 5 with respect to the damage occurrence status of the subscriber terminal 4 or the recovery status after the damage has occurred. Further, even when a power failure occurs due to lightning or the like, for example, it is possible to easily grasp the overall damage status and recovery status of each subscriber accommodation server 5 as well.

[About the program]
Note that a series of processes executed by the maintenance center terminal 2 in the first embodiment and the second embodiment described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software executes various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a program recording medium in a general-purpose personal computer or the like.

  FIG. 7 is a block diagram showing a hardware configuration example of a computer that executes a series of processing executed by the maintenance center terminal 2 in the first embodiment and the second embodiment described above by a program.

  In the computer, a CPU (Central Processing Unit) 51, a ROM (Read Only Memory) 52, and a RAM (Random Access Memory) 53 are connected to each other by a bus 54.

  An input / output interface 55 is further connected to the bus 54. The input / output interface 55 includes an input unit 56 composed of a keyboard, mouse, microphone, etc., an output unit 57 composed of a display, a speaker, etc., a storage unit 58 composed of a hard disk and a non-volatile memory, and a communication unit 59 composed of a network interface. A drive 60 for driving a removable medium 61 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is connected.

  In the computer configured as described above, the CPU 51 loads the program stored in the storage unit 58 to the RAM 53 via the input / output interface 55 and the bus 54 and executes the program, for example. Is performed.

  The program executed by the computer (CPU 51) is, for example, a magnetic disk (including a flexible disk), an optical disk (CD-ROM (Compact Disc-Read Only Memory), DVD (Digital Versatile Disc), etc.), a magneto-optical disk, or a semiconductor. It is recorded on a removable medium 61, which is a package medium composed of a memory or the like, or is provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  The program can be installed in the computer by installing the removable medium 61 in the drive 60 and storing it in the storage unit 58 via the input / output interface 55. Further, the program can be installed in a computer by being received by the communication unit 59 via a wired or wireless transmission medium and stored in the storage unit 58. In addition, the program can be installed in the computer in advance by storing the program in the ROM 52 or the storage unit 58 in advance.

  The program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.

  The embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the setting unit 11 specifies the area to be displayed or the subscriber accommodation server 5 in addition to the threshold value specification, and the display determination unit 14 specifies the setting unit 11 from the information retrieved by the installation information specifying unit 13. The subscriber terminal 4 that satisfies the above is specified, and the ratio of the subscriber terminals 4 in a state in which a call is impossible among the specified subscriber terminals 4 is calculated, and the display determination unit 14 calculates the calculated ratio The information indicating the area where is equal to or less than the threshold value specified in the setting unit 11 or the information indicating the subscriber accommodation server 5 which is equal to or less than the threshold value specified in the setting unit 11 You may make it display on the display part of the terminal 2. FIG. As a result, it is possible to easily grasp the damage occurrence status or damage recovery status in the area desired by the user or in the unit of the subscriber accommodation server 5.

  Further, the display determination unit 14 addresses the information indicating the location of the subscriber terminal 4 searched by the search unit 12 by the installation information specifying unit 13 or the information indicating the subscriber accommodation server 5 in which the subscriber terminal 4 is accommodated. When the response from the information providing server 3 cannot be acquired, information indicating the subscriber terminal 4 searched by the search unit 12 may be displayed on the display unit. As a result, even when communication with the address information providing server 3 becomes impossible due to a large-scale earthquake, the maintenance center terminal 2 identifies the subscriber terminal 4 that cannot make a call. Can be displayed.

  In addition, the display method executed by the maintenance center terminal 2 and the program installed in the maintenance center terminal 2 have the same effects as the above-described effects produced by the maintenance center terminal 2.

DESCRIPTION OF SYMBOLS 1 ... Telephone network system, 2 ... Maintenance center terminal (an example of a display apparatus), 3 ... Address information provision server, 4 ... Subscriber terminal, 11 ... Setting part, 12 ... Search part (an example of a 1st search collection means) , 13 ... address information specifying unit (an example of second search collection unit), 14 ... display determination unit (an example of calculation unit and display control unit),

Claims (6)

In the display device that displays information on the display unit according to the connection state of the subscriber terminal accommodated under the subscriber accommodation device,
A setting means for setting a threshold value indicating a ratio of the subscriber terminals in a state where a connection with the subscriber accommodation device cannot be established and a call is impossible;
First search and collection means for searching and collecting connection states of the subscriber terminals;
Based on the connection state of the subscriber terminal collected by the first search and collection means with reference to a storage device in which information for uniquely identifying the subscriber terminal and installation information of the subscriber terminal are associated with each other Second search and collection means for searching and collecting the installation information,
The connection status of the subscriber terminal is totaled for each installation information of the subscriber terminal collected by the second search collecting means, and the connection with the subscriber accommodation device cannot be established, so that the call becomes impossible. Calculating means for calculating a ratio of the subscriber terminals in a state of being present;
Display control means for displaying on the display unit installation information of the subscriber terminal whose ratio calculated by the calculating means is a value that satisfies the threshold set by the setting means;
A display device comprising:
The display device according to claim 1,
The setting information is information indicating an area where the subscriber terminal is installed, or information indicating the subscriber accommodation device in which the subscriber terminal is accommodated,
The display control means includes
Information indicating an area where the ratio calculated by the calculating means is less than or equal to the threshold set by the setting means, or the subscriber who is less than or equal to the threshold set by the setting means A display device that displays information indicating a storage device on the display unit.
The display device according to claim 1 or 2,
The setting means includes
In addition to the setting of the threshold, set the area to be displayed or subscriber accommodation device,
The calculating means includes
The subscriber terminal that satisfies the setting condition by the setting means is specified from the information searched by the second search and collecting means, and the connection with the subscriber accommodation device cannot be established among the specified subscriber terminals. , Calculate the percentage of subscriber devices that are disabled
The display control means includes
A display device, wherein information indicating an area where a ratio calculated by the calculating means satisfies a setting condition by the setting means or information indicating the subscriber accommodation device is displayed on the display unit.
The display device according to any one of claims 1 to 3,
The display control means includes
When the second search / collection means cannot refer to the storage device for the installation information of the subscriber terminal searched by the first search / collection means, the subscriber terminal searched by the first search means The display device displays information to be displayed on the display unit.
In a display method for displaying information on the display unit according to the connection state of the subscriber terminal accommodated under the subscriber accommodation device,
A setting step for setting a threshold value indicating a ratio of the subscriber terminals in a state where a connection with the subscriber accommodation device cannot be established and a call is impossible;
A first search and collection step of searching and collecting connection states of the subscriber terminals;
Based on the connection state of the subscriber terminal collected in the first search collection step with reference to a storage device in which the information uniquely identifying the subscriber terminal is associated with the installation information of the subscriber terminal A second search and collection step for retrieving and collecting installation information;
The connection state of the subscriber terminal is totaled for each installation information of the subscriber terminal collected in the second search and collection step, and the connection with the subscriber accommodation device cannot be established, so that the call becomes impossible. A calculating step for calculating a ratio of the subscriber terminals in a state of being,
A display control step of causing the display unit to display installation information of the subscriber terminal in which the ratio calculated in the calculation step is a value satisfying the threshold set in the setting step. .
A computer that displays information on the display unit according to the connection state of the subscriber terminal accommodated under the subscriber accommodation device,
A setting means for setting a threshold value indicating a ratio of the subscriber terminals in a state where a connection with the subscriber accommodation device cannot be established and a call is impossible;
First search and collection means for searching and collecting connection states of the subscriber terminals;
Based on the connection state of the subscriber terminal collected by the first search and collection means with reference to a storage device in which information for uniquely identifying the subscriber terminal and installation information of the subscriber terminal are associated with each other Second search and collection means for searching and collecting the installation information,
The connection status of the subscriber terminal is totaled for each installation information of the subscriber terminal collected by the second search collecting means, and the connection with the subscriber accommodation device cannot be established, so that the call becomes impossible. Calculating means for calculating a ratio of the subscriber terminals in a state of being present;
Display control means for causing the display unit to display installation information of the subscriber terminal whose ratio calculated by the calculating means is a value that satisfies the threshold set by the setting means;
Program to function as.

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