Intercom system

Abstract

To provide an intercom system that posts image data at an entrance to enable a visitor to call a resident using a device carried by the visitor based on the image data, and moreover that can maintain security.SOLUTION: An intercom system includes a mobile terminal 10 carried by a visitor, a communication terminal 20 operated by a resident, a server 40 that manages communication between the two, and image data 30 posted at an entrance. The mobile terminal 10 has a camera 11 and a function of reading the data by imaging the image data 30 with a camera 33, and the server 40 has a call destination information storage unit 41 that stores the association between the image data 30 and a specific communication terminal 20. When the mobile terminal 10 reads the image data 30, the mobile terminal accesses the server 40 based on information of the image data 30, obtains a web page for calling the resident's communication terminal 20, and is able to call the communication terminal 20. The server 40 counts the time that has elapsed since the web page was sent, and prohibits the call after a predetermined time has elapsed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an intercom system in which a visitor can call a resident, and particularly to an intercom system in which a visitor can call a resident without providing an intercom device for calling at the entrance.

Background Art

[0002] In an intercom system for calling a resident, an intercom handset for calling a resident is installed at the entrance, while an intercom master unit for responding to a call is installed inside the dwelling unit. Thus, when a visitor operates the intercom handset to make a call, the intercom master unit emits a ringing sound, and the resident can communicate by operating the intercom master unit in response.

[0003] On the other hand, in recent years, mobile terminals such as mobile phones have become widespread, and it has become common for visitors to carry mobile terminals when visiting. In view of this situation, a technology for using a mobile terminal instead of an intercom handset has been considered. For example, Patent Document 1 discloses a technology for a system that notifies a person in charge when a visitor arrives at a company or the like. A QR code (registered trademark) is placed at the reception area of a company or the like, and when a visitor captures the QR code (registered trademark) with a mobile terminal, the person in charge can be called. This is configured such that when the mobile terminal accesses the server by reading the QR code (registered trademark), web information associated with the QR code (registered trademark) is returned from the server and displayed, and the visitor performs an input operation such as entering a passcode according to this display, thereby notifying the terminal of the person in charge at the visit destination of the arrival of the visitor. As a result, it is no longer necessary to install a device for calling, such as an intercom handset, at the reception area. And in Cited Document 1, by obtaining the position information of the mobile terminal called by the server based on GPS information and performing a process of not accepting calls from a location completely different from the reception area, the occurrence of calls unrelated to subsequent misoperations by the visitor is prevented.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent No. 7151013 [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] The technology disclosed in the above Patent Document 1 can eliminate the equipment for calling at the reception place of enterprises and the like, so that cost reduction can be achieved. However, when considering the application of this technology to an intercom in a general household, the limitation by the GPS location information may malfunction indoors and GPS spoofing is possible. Therefore, the presence of malicious visitors or pranksters cannot be ignored, and it was necessary to construct a further security enhancement mechanism.

[0006] Therefore, in view of such problems, the present invention aims to provide an intercom system that can post image data at the entrance instead of the intercom sub-unit, and based on this image data, a visitor can call a resident with the equipment they carry, and moreover, security can be maintained. [Means for Solving the Problems]

[0007] In order to solve the above problems, the configuration of the present invention includes a mobile terminal carried by a visitor having a function of communicating with an external device via a public communication network, a communication terminal operated by a resident having a function of communicating with an external device via a public communication network, and a server for managing communication between the mobile terminal and the communication terminal. An intercom system having: image data for calling the communication terminal using the mobile terminal is posted at the entrance; the mobile terminal has a call function, a camera, and a function of reading image data by imaging with the camera; furthermore, the server has a call destination information storage unit for storing the association between the image data and a specific communication terminal; when the mobile terminal reads the image data, it accesses the server based on the information of the image data, obtains Web information for calling the communication terminal associated with the image data from the server, and can call the communication terminal from the Web information. On the other hand, the server counts the elapsed time since the Web information was transmitted, and prohibits the call when a predetermined time has elapsed. According to this configuration, since a resident can be called by imaging the image data posted at the entrance using the mobile terminal carried by the visitor himself / herself, the resident can be called even without an intercom device at the entrance. Nevertheless, since the call is prohibited when a predetermined time has elapsed after obtaining the Web information for calling the communication terminal, even if the visitor is a suspicious person or a malicious visitor, the call can be restricted and security can be maintained.

[0008] Another aspect of the present invention is characterized in that, in the above configuration, the server prohibits subsequent calls if the number of calls set by the mobile terminal reaches a certain number during the period after the Web information is transmitted until a predetermined time elapses. According to this configuration, since both the calls within a predetermined time and the number of calls are restricted, malicious calls can be eliminated.

[0009] Another aspect of the present invention is that, in the above configuration, the server has an SSID information storage unit that associates a specific access point with each communication terminal and stores the SSID information thereof. When the server transmits Web information to the mobile terminal that has received access, it obtains the SSID information received by the mobile terminal from the mobile terminal. If the SSID stored in association with the communication terminal is not included in the obtained information, the server does not permit the mobile terminal to call the communication terminal based on the Web information. According to this configuration, even within a predetermined time, if the SSID of the access point received by the mobile terminal does not include the one associated with the communication terminal of the resident, the call is not permitted. That is, if the registered information of the SSID is set as the signal transmitted from the visited household or its vicinity, the resident cannot be called even if the Web information is obtained unless the user is near the visited household. Therefore, malicious calls and mischievous calls can be prevented.

[0010] Another aspect of the present invention is that, in the above configuration, the server has a face detection unit that detects a face from the captured image and a face image storage unit that stores the face image transmitted from the mobile terminal. In addition to transmitting the Web information, the server requests the transmission of the captured image of the face of the visitor. If a face is detected from the image transmitted from the mobile terminal in response to this request, the server stores the image and permits the mobile terminal to call the communication terminal based on the Web information. On the other hand, if a face cannot be detected from the transmitted image, the server does not permit the call of the communication terminal based on the Web information. According to this configuration, even within a predetermined time, the call is not permitted unless the face image of the visitor himself / herself is transmitted. Therefore, if the visitor who made the call is a malicious person such as a suspicious person, the visitor can be identified from the obtained face image of the visitor, which helps to maintain security.

Effects of the Invention

[0011] According to the present invention, by using a mobile terminal carried by the visitor himself / herself to capture the image data posted at the entrance, the resident can be called, so the resident can be called even without an intercom device at the entrance. However, since the call is prohibited after a predetermined time has elapsed after obtaining the Web information for calling the communication terminal, even if the visitor is a suspicious person or a malicious visitor with ill intentions, the call can be restricted and security can be maintained.

Brief Description of the Drawings

[0012]

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Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an example of an intercom system 1 according to the present invention, including a mobile terminal 10 carried by a visitor, a communication terminal 20 carried by a resident or installed in a residential unit H, image data (two-dimensional code information) 30 posted at the entrance of the residential unit for obtaining information of the communication terminal 20, a server 40 disposed on the cloud (on a public communication network N), and the like.

[0014] FIG. 2 shows a block diagram of the mobile terminal 10. As shown in FIG. 2, the mobile terminal 10 includes a camera 11, a display 12 for displaying various information, an operation unit 13 including a call button / end call button, etc., a memory 14 for storing received information and application software (hereinafter simply referred to as "app"), a communication unit 15, a wireless communication interface (wireless communication IF) 16 for wirelessly communicating with other devices via a public communication network or the like, a mobile terminal CPU 17 for controlling these, and the like. The wireless communication IF 16 has an antenna for wirelessly connecting to the public communication network N or performing short-range wireless communication such as Bluetooth (registered trademark) and Wi-Fi with nearby devices, and performs data transmission and reception with the server 40 and the like via the public communication network N. The data to be transmitted and received is, for example, video data, text data, and program data.

[0015] The image data 30 is, for example, a QR code (registered trademark), and includes information that enables access to the communication terminal 20 of the destination via the public communication network N. This image data 30 is posted on the entrance wall or the entrance door so that the visitor can capture it with a camera, and when the visitor captures it with the camera 11 of the mobile terminal 10 and takes in the information, URL information of the server 40 and the like is read. Note that the image data 30 is not limited to a QR code (registered trademark), and may be a bar code or a numeric string. The public communication network N is, for example, the Internet or a telephone line.

[0016] The mobile terminal 10 is pre-installed with an app that reads the URL of the server 40 by imaging the posted image data 30 with the camera 11 and accesses the read URL. When the image data 30 is read by this app, it accesses the server 40, and a web page, which is web information associated with the destination household H from the server 40, is transmitted.

[0017] The display 12 is composed of an LCD and displays video, images, and character information. The operation unit 13 consists of a touch panel, is integrated with the display 12, and enables various operations including a call operation. The mobile terminal 10 can be, for example, a multifunctional mobile phone (smartphone), but it can also be a tablet-type terminal.

[0018] Figure 3 shows a block diagram of the communication terminal 20. As shown in Figure 3, the communication terminal 20 includes a display 21 that displays various information, an operation unit 22 that performs various operations including a call button for responding to a call, a memory 23 that stores received information and apps, a call unit 24, a camera 25, a communication interface (communication IF) 26 that communicates wirelessly or wired with other devices via a public communication network N, etc., and a communication terminal CPU 27 that controls these. As the communication terminal 20, a device carried and used by a resident such as a multifunctional mobile phone (smartphone) can be used, but it can also be a personal computer or a general-purpose tablet-type terminal. Furthermore, it can be a dedicated terminal fixedly installed indoors. By installing a predetermined app and registering a user with the server 40 by a predetermined operation, even a general-purpose terminal can function as the communication terminal 20. In addition, in Figure 1, it is a multifunctional mobile phone.

[0019] FIG. 4 shows a block diagram of the server 40. As shown in FIG. 4, the server 40 includes a called party information storage unit 41 that stores a plurality of household information items associating the image data 30 and the communication terminal 20, a call management unit 42 that stores conditions for imposing restrictions on calls, an SSID information storage unit 43 that stores an association between the communication terminal 20 and the SSID of a wireless LAN access point (hereinafter simply referred to as an “access point”), an image data generation unit 45 that generates the image data 30, a server communication interface (server communication IF) 46 that communicates with external devices via the public communication network N, a server CPU 47 that controls these components, and the like. Note that the SSID of the access point to be stored is preferably the SSID of the access point installed in the destination household. However, even if it is the SSID of the access point installed near the destination household, it is acceptable because the area of the mobile terminal 10 can be limited.

[0020] In the called party information storage unit 41, associations between the image data 30 of a plurality of households H and the communication terminal 20 are registered and stored. Also, information regarding the resident is associated and stored together with the information of the communication terminal 20.

[0021] The server CPU 47 receives access from the mobile terminal 10 that has read the image data 30, selects the communication terminal 20 associated with the image data 30, that is, selects the communication terminal 20 of the destination household H, and performs control to return a Web page for calling the selected communication terminal 20 to the mobile terminal 10. However, it is determined whether the accessed mobile terminal 10 satisfies a predetermined condition. If the predetermined condition is not satisfied, even if the mobile terminal 10 performs a call operation of the communication terminal 20 based on the Web page, control is performed so that the call cannot be made.

[0022] Here, the image data 30 will be described. When the communication terminal 20 is registered, the server 40 generates user-specific image data 30 in the image data generation unit 45. This data is transmitted to the communication terminal 20. The resident who has thus obtained the image data 30 prints it or the like and posts it at the entrance. This image data 30 has the URL information of the server 40 registered therein. When a visitor captures the image data 30 with the camera 11 of the mobile terminal 10, the mobile terminal 10 reads the information, recognizes the URL of the server 40 and performs an access operation, and is transmitted to the server 40 together with the information of the image data 30 for identifying the communication terminal 20.

[0023] The intercom system 1 configured as described above operates as follows. FIG. 5 is an operation transition diagram from when the mobile terminal 10 reads the image data 30 until a call is made and further a call is made, and will be described with reference to this FIG. 5. However, here, control is performed to limit the call by two conditions, namely, the conditions of the call time and the number of call times and the conditions regarding the SSID information. This setting condition is stored and managed in the call management unit 42.

[0024] When a visitor who has come to the visited household H captures the image data 30 posted at the entrance with the mobile terminal 10 carried, the installed application reads the image data 30 and accesses the URL destination included in the read information. That is, it accesses the server 40 (S1).

[0025] The server 40 that has received the access from the mobile terminal 10 starts counting for a predetermined time (for example, 10 minutes) by starting a timer provided in the server CPU 47 based on the conditions set in the call management unit 42. Then, based on the information of the image data 30 transmitted from the mobile terminal 10 at the time of access, it returns a web page for calling the communication terminal 20 associated with the image data 30 (S2). Specifically, it returns the top page of the web page for calling the communication terminal 20. The mobile terminal 10 that has received the web page from the server 40 displays the web page on the display 12 (S3). Furthermore, the server 40 transmits a command for requesting the SSID information of the access point received by the mobile terminal 10 to the mobile terminal 10 in accordance with the transmission of this web page.

[0026] FIG. 6 is an explanatory view of the display of the mobile terminal 10 showing the received web page. As shown in FIG. 6, a call button B1 is displayed on the display 12 together with precautions. When the call button B1 thus displayed is pressed (touched), the SSID information received by the mobile terminal 10 together with the call signal is transmitted (S4) to the server 40. At this time, if a plurality of SSIDs have been received, these plurality of SSID information (a list of SSIDs) are transmitted. At the server 40 to which the SSID information has been transmitted together with the call signal, the server CPU 47 makes a determination as follows according to the conditions of the call management unit 42.

[0027] Of the two conditions set in the call management unit 42, first the time condition is judged. If the time condition is within 10 minutes and the number of calls is 3 or less, it is judged whether it is within 10 minutes after transmitting the web page and the number of call operations is 3 or less. If this condition is satisfied, then the SSID condition is judged next. If not satisfied, the call is made unavailable at that point and the call control ends. For example, even if it is within 10 minutes but it is the fourth call, the call is judged to be unavailable and the call control is not performed.

[0028] If satisfied, then it is checked whether there is an SSID registered in the SSID information storage unit 43 associated with the communication terminal 20 to be called among the transmitted SSID list. If there is a registered SSID, since the two conditions are satisfied, the call is permitted and a call signal is transmitted to the communication terminal 20 (S6). If there is no registered SSID in the list, the call signal is not transmitted to the communication terminal 20 and the call control ends. In addition, when the call control ends without satisfying the conditions, a message indicating that the call cannot be made is transmitted to and displayed on the mobile terminal 10.

[0029] Thus, when a call signal is transmitted to the communication terminal 20, the server 40 transmits the second page of the web page to the mobile terminal 10 and causes the displayed web page to be updated to the page during the call (S7). FIG. 7 shows the display 12 of the mobile terminal 10 that has displayed the second page of the transmitted web page. As shown in FIG. 7, "Calling" is displayed, and a guidance message is displayed.

[0030] The communication terminal 20 that has received the call signal enters the called state and performs a calling operation (S8). This calling operation is performed in a different manner from other calls so that it can be recognized by the application installed to function as an intercom that the call is from a visitor. For example, a message such as "Call from the entrance" is displayed on the display 21. By this display or the like, the resident can recognize that the call is from a visitor to the home before responding.

[0031] Thereafter, when the call button (not shown) of the communication terminal 20 is pressed (S8) for a response operation, the server 40 permits the call (S10), a call path is formed between the mobile terminal 10 and the communication terminal 20, and a call becomes possible (S11) between the visitor and the resident.

[0032] When the call path is formed, under the control of the application installed in the server 40, the camera 11 of the mobile terminal 10 and the camera 25 of the communication terminal 20 are activated, and the captured video image of the responding resident is displayed on the display 12 of the mobile terminal 10. The display area E1 of "Calling" in FIG. 7 is a video display area, and the face video image of the resident received from the communication terminal 20 is displayed in this display area E1. On the other hand, the face video image of the visitor received from the mobile terminal 10 is also displayed on the display 21 of the communication terminal 20. Thus, the call is carried out while seeing the other party. Thereafter, when the resident performs an end call operation on the communication terminal 20 or the visitor performs an end call operation on the mobile terminal 10, the server 40 cuts off the call path, and both devices return to the standby state.

[0033] Also, when registering the communication terminal 20 with the server 40, if the name, address, etc. of the resident are registered together, the name information, etc. of the responding resident can be displayed on the mobile terminal 10 when making a call or when the resident responds. Also, it is assumed that an access point is installed so that the SSID registered with the server 40 can be received at the location where the image data 30 is posted.

[0034] In this way, by using the mobile terminal 10 carried by the visitor himself / herself to capture the image data 30 posted at the entrance of the visited house, the resident can be called, so the resident can be called even if there is no intercom device at the entrance. However, since the call is prohibited if a predetermined time has elapsed after obtaining the web page for calling the communication terminal 20, even if the visitor is a suspicious person or a malicious visitor with ill intent, the call can be restricted and security can be maintained. Furthermore, by restricting the number of times within a predetermined time, frequent calls can be prevented. Also, if there is no SSID registered in association with the resident's communication terminal 20 among the SSIDs received by the mobile terminal 10, the call is not permitted. That is, by setting the SSID to be registered as a signal transmitted from the visited household or its vicinity, the callable area is limited, so even if web information is obtained without being near the visited household, the resident cannot be called. Therefore, malicious calls and mischievous calls can be prevented.

[0035] Also, in the above embodiment, as conditions for permitting a call, if it is within 10 minutes and 3 times or less after transmitting the web page and a predetermined SSID is received, the call is permitted. However, security can be maintained even with only time-related restrictions without the SSID condition. Also, the time limit and the number of calls can be changed according to the user's situation. For example, the conditions can be changed to within 5 times in 24 hours, etc. Furthermore, only the time limit can be set without restricting the number of times. Also, instead of the restriction based on the SSID information, the restriction can be based on the Bluetooth (registered trademark) beacon information received by the mobile terminal 10. Since the reception becomes impossible when away from the visited household H, the same restriction can be added.

[0036] Next, another form of the intercom system 1 will be described. In the above form, in addition to the time limit, the place limit was added based on the SSID information. However, instead of the SSID, the transmission of the visitor's face image may be added to the time limit. Hereinafter, a configuration for restricting calls based on two conditions of time conditions and face image registration will be described.

[0037] FIG. 8 shows another form of the intercom system 1 and is a block diagram of the server 40. Since the configuration of the entire system, the configurations of the mobile terminal 10 and the communication terminal 20 are the same as those in the above form, the description thereof will be omitted. As shown in FIG. 8, the server 40 includes a called party information storage unit 41 that stores the association between the image data 30 and the communication terminal 20, a call management unit 42 that stores conditions for providing restrictions on calls, an image data generation unit 45 that generates the image data 30, a server communication interface (server communication IF) 46 that communicates with an external device via a public communication network, and a server CPU 47 that controls these. In addition, the server 40 includes a face detection unit 48 that detects a face from the captured image (or captured video) of the camera 11, and a face storage unit (face image storage unit) 49 that stores the face image.

[0038] FIG. 9 is an operation transition diagram from a call operation to a call. The operation will be described with reference to FIG. 9. When a visitor who has come to the visited household captures the image data 30 posted at the entrance with the mobile terminal 10 carried by the visitor, the installed application reads the image data 30 and accesses the URL destination included in the read information. That is, the server 40 is accessed (S101).

[0039] Upon receiving access from the mobile terminal 10, the server 40 activates a timer included in the server CPU 47 based on the conditions set in the call management unit 42 and starts counting for a predetermined time (e.g., 10 minutes). Then, based on the information of the image data 30 transmitted from the mobile terminal 10 when the access is received, a web page for calling the communication terminal 20 associated with the image data 30 is returned (S102). Specifically, the top page of the web page for calling the communication terminal 20 is transmitted, and the mobile terminal 10 that has received the web page from the server 40 displays the web page (S103). Also, the server 40 transmits a command to activate the camera 11 of the mobile terminal 10 in accordance with the transmission of this web page. The mobile terminal 10 that has received the web page displays it on the display 12 and activates the camera 11 according to the received command.

[0040] FIG. 10 is an explanatory diagram of the display of the mobile terminal 10 showing the received web page. As shown in FIG. 10, operation information indicating that the camera 11 is activated to capture a face is displayed on the display 12 together with the call button B1. When the displayed call button B2 is pressed (touch operation) (S104), the captured video of the camera 11 is transmitted to the server 40 together with the call signal. At the server 40 to which the captured video of the camera 11 is transmitted together with the call signal, the server CPU 47 controls as follows based on the conditions of the call management unit 42. Here, although the flow is to transmit the captured video of the camera 11 from the mobile terminal 10, a still image (captured image) may be transmitted instead.

[0041] First, the time condition is judged. This is the same as in the above embodiment, and it is judged whether it is within the predetermined time set after transmitting the web page and the number of call operations is equal to or less than a predetermined number (whether the time condition is satisfied). If this condition is not satisfied, the call control ends at this stage. If it is satisfied, then the face detection unit 48 determines whether the next transmitted video is a face captured video (S105). If a face is detected from the video, it is saved in the face storage unit 49. Then, the call is permitted to satisfy the two conditions, and the call of the communication terminal 20 is carried out (S106). Specifically, a call signal is transmitted to the communication terminal 20. However, if the face cannot be detected and recognized, the captured video (image) is requested again, or the call control is terminated.

[0042] In this way, when a call signal is transmitted to the communication terminal 20, the server 40 transmits the second page of the web page to the mobile terminal 10. The mobile terminal 10 that has received the transmission of the second page updates the displayed web page to a page during a call as shown in FIG. 7 above (S107). The subsequent operations are the same as those in the above embodiment. The communication terminal 20 that has received the call signal becomes in a called state and performs a call operation (S108). When the resident presses the call button (not shown) of the communication terminal 20 after receiving the call (S109), the server 40 permits the call (S110), a call path is formed between the mobile terminal 10 and the communication terminal 20, and a call becomes possible between the visitor and the resident (S111).

[0043] In this way, after the server 40 receives access from the mobile terminal 10 and returns a web page, if the visitor's own face image is not transmitted even within a predetermined time, the call is not permitted. Therefore, if the calling visitor is a suspicious person with malicious intent such as a person with ill intentions, the visitor can be identified from the obtained face image of the visitor, which helps to maintain security.

[0044] In addition, in the above embodiment, the registration of the face image is performed every time a call operation is performed. This is because it is conceivable that the operator of the mobile terminal 10 is not the same person. However, if it is premised on a call operation by the same person, the control may be such that the face image is requested only for the first call operation. Also, by combining the functions of the above two embodiments, the conditions of SSID reception and face image transmission are combined with the time limit, and the call may be permitted when three conditions are satisfied.

Explanation of Signs

[0045] 1... Intercom system, 10... Mobile terminal, 11... Camera, 12... Display, 13... Operation unit, 14... Memory, 15... Call unit, 16... Wireless communication IF, 17... Mobile terminal CPU, 20... Communication terminal, 21... Display, 22... Operation unit, 23... Memory, 24... Call unit, 25... Wireless communication IF, 27... Communication terminal CPU, 30... Image data, 40... Server, 41... Destination information storage unit, 42... Call management unit, 43... SSID information storage unit, 48... Face detection unit, 49... Face storage unit (face image storage unit), 45... Image data generation unit, 46... Server communication IF, 47... Server CPU, N... Public communication network.

Claims

1. An intercom system having a mobile terminal carried by a visitor having a function of communicating with an external device via a public communication network, a communication terminal operated by a resident having a function of communicating with an external device via a public communication network, and a server for managing communication between the mobile terminal and the communication terminal, Image data for calling the communication terminal using the mobile terminal is posted at the entrance, and The mobile terminal has a call function, a camera, and a function of reading the image data by imaging the image data with the camera, Further, the server has a called party information storage unit for storing the association between the image data and a specific communication terminal, When the mobile terminal reads the image data, it accesses the server based on the information of the image data, obtains Web information for calling the communication terminal associated with the image data from the server, and can call the communication terminal from the Web information. On the other hand, The server counts the elapsed time since transmitting the Web information, and prohibits the call when a predetermined time has elapsed. An intercom system characterized by this.

2. The server according to claim 1, wherein when the number of calls set by the mobile terminal reaches a predetermined number during a predetermined time after transmitting the Web information, subsequent calls are prohibited. Intercom system.

3. The server has an SSID information storage unit that associates a specific access point with each communication terminal and stores the SSID information, When the server transmits the Web information to the mobile terminal that has received the access, it obtains the SSID information received by the mobile terminal from the mobile terminal at the same time, The intercom system according to claim 1 or 2, wherein if the SSID stored in association with the communication terminal is not included in the obtained information, the call of the communication terminal by the mobile terminal based on the Web information is not permitted.

4. The server includes a face detection unit that detects a face from a captured image, and a face image storage unit that stores the face image transmitted from the mobile terminal. In addition to transmitting the Web information, the server makes a request to transmit a captured image of the face of the visitor. When the face is detected from the image transmitted from the mobile terminal in response to this request, the server stores the image and permits the mobile terminal to call the communication terminal based on the Web information. On the other hand, if the face cannot be detected from the transmitted image, the intercom system according to claim 1 or 2, wherein the calling of the communication terminal based on the Web information is not permitted.

Images