KR20130109361A - Method of changing resolution of image communication function and system for it - Google Patents

Abstract

PURPOSE: A video call resolution change method during a content sharing service and a system thereof are provided to reduce a load of a terminal CPU by changing the resolution of a video call in the case that a sharing service is performed during the video call. CONSTITUTION: A camera (221) generates video call data which is to be transmitted to another terminal when a certain video call application is activated. A display unit (241) outputs the video call data which is transmitted by the other terminal on one side when the video call application is activated. If the video call application is activated, a control unit (260) adjusts the resolution of the video call data by controlling an operation mode of the camera. The control unit measures a load of a CPU if a sharing service application which shares certain contents with the other terminal is activated while the video call with the other terminal is proceeding. The control unit adjusts the resolution of the video call data according to a given resolution information table. [Reference numerals] (210) Wireless communication unit; (211) Mobile communication module; (220) A/V input unit; (221) Camera; (222) Microphone; (230) User input unit; (240) Output unit; (241) Display unit; (242) Sound output module; (250) Memory; (260) Control unit; (261) Multimedia module; (262) Image frame control unit

Description

Method of changing resolution of image communication function and system for it}

The present invention relates to a method and a system for providing a video call service based on a Session Initiation Protocol (SIP). Specifically, a resolution of a video call is changed according to a load rate when a user uses a sharing service of multimedia content during a video call. The present invention relates to a method and a system for changing video call resolution according to multimedia content sharing.

Voice communication services in existing Public Land Mobile Network (PLMN) and Public Switched Telephone Network (PSTN) have recently gained the spotlight in wired / wireless Internet networks (IP), as opposed to simple information exchange between users. Video telephony services (eg, conferences, telephones, voice mails, event notifications, instant messaging, etc.) in a network or packet data network enable voice calls while viewing the faces of participants between users.

The video call service in the wired / wireless internet network is based on SIP. SIP is an application layer signaling protocol that specifies a procedure for creating / modifying / ending sessions between video call participants.

Recently, in order to enhance users' interest in the video call service and to activate service use, various additional services such as transmitting predetermined multimedia contents to the counterpart user as well as the user's image have been provided. There is a need for technology development to improve the performance of services.

Among the additional services provided when using a video call service, for example, a sharing service for sharing various multimedia contents during a video call among users may be exemplified.

However, there is a problem of reducing the resolution of a video call or a poor call service due to an increase in CPU load in the user terminal during the sharing service during the video call.

Disclosure of Invention An object of the present invention is to solve the above problems, and to propose a method of reducing the load ratio of the terminal CPU and improving service performance by changing the resolution of the video call when the shared service is performed when using the video call service.

In addition, an object of the present invention is to provide a smooth video call service by implementing an automatic resolution check algorithm according to the load to change the resolution of the image data to various levels in accordance with the load share of the multimedia content to be shared during the shared service during the video call I would suggest a way.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, a method of providing a video call service when using a sharing service for sharing predetermined content among session initiation protocol (SIP) based video call services according to an embodiment of the present invention is provided. (a) requesting a sharing service for sharing predetermined content from any one of the first terminal and the second terminal in a state where a video call session between the first terminal and the second terminal is established; (b) in the case of providing a sharing service according to the sharing service request, first changing a resolution of video call data transmitted during a video call between the first terminal and the second terminal; And (c) when the shared service is in progress, the first terminal and the second terminal measuring the CPU load and changing the second resolution of the video call data according to a preset resolution information table. In this case, the resolution information table may include the optimized resolution information of the video call data based on the CPU load that varies with the progress of the sharing service.

Preferably, in the step (a) according to an embodiment of the present invention, the video call data transmitted and received between the first terminal and the second terminal may correspond to a video graphics array (VGA) form.

On the other hand, in the step (b) according to an embodiment of the present invention, the video call session is established with a first UPDATE message requesting a resolution change of the video call data from any one of the first terminal and the second terminal Transmitting to another terminal; And changing the resolution of the video call data in the first terminal and the second terminal according to a response to the first UPDATE message from the other terminal.

Preferably, in the step (b) according to the embodiment of the present invention, the video call data may be first modified in the form of QCIF (Quarter Common Intermediate Form).

Next, the step (c) according to the embodiment of the present invention may include the step of measuring the CPU load of the first terminal and the second terminal in a predetermined period or real time as the sharing service progresses.

For example, the step (c) according to the embodiment of the present invention includes maintaining the resolution of the first changed video call data when the CPU load measurement value is greater than or equal to a predetermined reference value. If less than a predetermined reference value, it may include a second step of changing the resolution of the video call data according to the resolution information table.

In this case, in the second resolution changing step, the video call session establishes a second UPDATE message requesting a resolution change of the video call data from one of the first terminal and the second terminal. Transmitting to the other terminal; And secondly changing the resolution of the video call data in the first terminal and the second terminal in response to the second UPDATE message from the other terminal.

Preferably, the video call data may be secondly changed to one of QCIF, CIF (Common Intermediate Form), 4CIF (Common Intermediate Form), and VGA according to the resolution information table.

In an embodiment of the present disclosure, the method may further include changing the video call data to VGA when the sharing service is terminated while the video call session between the first terminal and the second terminal is established.

Next, a terminal using a session initiation protocol (SIP) based video call service through a mobile communication network according to another embodiment of the present invention for solving the above-described problem, a predetermined video call application A camera for generating video call data to be transmitted to the other terminal when activated; A display unit configured to output video call data transmitted from the other terminal to one surface as the video call application is activated; And a controller configured to control an operation mode of the camera to adjust the resolution of the video call data when the video call application is activated, wherein the controller is configured to perform a video call session with the other terminal. When the shared service application sharing the predetermined content with the user is activated, the CPU load is measured to adjust the resolution of the video call data according to a preset resolution information table.

Preferably, the control unit according to an embodiment of the present invention, as the shared service application is activated, can first change the video call data in the form of QCIF (Quarter Common Intermediate Form).

More preferably, the controller controls the video call data to be one of QCIF, Common Intermediate Form (CIF), Common Intermediate Form (4CIF), and VGA based on the resolution information table. You can change it.

The controller may control to change the video call data to VGA when the sharing service is terminated while the video call session with the other terminal is established.

On the other hand, as the shared service application is activated, the controller controls to switch the operation mode of the camera from the video shooting mode to the picture shooting mode, and divides the output screen of the display unit into one area of the other terminal. It is possible to control to output the video call data received from the web session to the shared service in the other area.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention by those skilled in the art. And can be understood and understood.

According to the present invention, when the shared service is performed when using the video call service, by changing the resolution of the video call, the load ratio of the terminal CPU can be lowered and the video call service performance can be improved.

In addition, according to the present invention, the video call service is smoothly provided by implementing an automatic resolution check algorithm according to the load that changes the resolution of the image data to various levels according to the load share of the multimedia content to be shared during the sharing service during the video call. can do.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a diagram illustrating an example of a video call service and a shared service providing system according to an embodiment of the present invention.
2 shows an example of a block diagram of a user terminal according to an embodiment of the present invention.
3 is a flowchart illustrating an example of a process of changing a video call resolution when using a shared service among video call services according to an embodiment of the present invention.
4 is a diagram illustrating an example of a video call resolution changing algorithm when a shared service is used among video call services in a user terminal according to an exemplary embodiment of the present invention.
5 is a diagram illustrating an embodiment in which a video call resolution is changed when a shared service is used among video call services in a user terminal according to an exemplary embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

The present invention provides a method and system for changing video call resolution according to multimedia content sharing that changes resolution of video call according to load rate when using multimedia content sharing service among session initiation protocol (SIP) based user calls. It is about.

1 is a diagram illustrating an example of a video call service and a multimedia content sharing service providing system according to an exemplary embodiment of the present invention.

Referring to Figure 1, the system 100 according to an embodiment of the present invention is a call session control function for a call processing, such as a video call service between the user terminal (101, 102) in an IP multimedia system network (IMS network) (Call Session Control Function: CSCF) 103, 104, SIP application server for performing call processing (e.g., message relay, service authentication, etc.) required to provide multimedia content to the user terminal (101, 102) (SIP) Application Server (AP) 105, 106 and a shared server 107 that performs session management related to the shared service.

As shown in Fig. 1, the CSCFs 103 and 104 corresponding to each user are assigned the ASs 105 and 106, the Home Subscriber Server (HSS) 108 and 109 corresponding to each user. Performs wired / wireless mobile communication such as a Media Gateway Control Function (MGCF) 110, a public switched telephone network (PSTN), and 2G / 3G.

The ASs 105 and 106 corresponding to each user are linked with the subscriber DBs 111 and 112, which store subscriber information (eg, user terminal information, service subscription status, and the like), and perform a video call service on multimedia content selected by one user. Wired and wireless mobile communication is performed with a media server (MS) 113 for transmitting to a user terminal in use.

While the one-to-one video call service between the user terminals 101 and 102 is in progress, the sharing service may be requested from the user terminal 101 of one side.

In this case, the AS 105 corresponding to the corresponding user terminal 101 detects a shared service request signal and requests the sharing server 107 to create a sharing room for sharing multimedia content with a plurality of participants with session information. Can be. Each AS 105 or 106 may transmit a shared service info message to each user terminal 101 or 102 together with shared session information (eg, a URL) including shared room information. Accordingly, each of the user terminals 101 and 102 in the video call can share the multimedia content designated by the sharing service applicant to be shared so as to access the sharing server 107 based on the sharing room information or the sharing session information.

At this time, the user terminal (101, 102) is used for the video call on the basis of the increased load according to the use of the shared service while performing the multi-session (processing) and the screen division when entering the shared service during the video call The resolution of the information (or video information) can be changed.

As with the existing video call service, the user terminals 101 and 102 used in the present invention include a mobile communication terminal, an IP telephone, a computer, a laptop, a PDA, and the like. A user terminal according to an embodiment of the present invention will be briefly described with reference to FIG. 2.

2 shows an example of a block diagram of a user terminal according to an embodiment of the present invention.

Referring to FIG. 2, the user terminal 200 according to an exemplary embodiment of the present invention may include a wireless communication unit 210, an A / V input unit 220, a user input unit 230, and an output unit 240. , A memory 250, a controller 260, and the like. The components shown in FIG. 2 are not essential, so a user terminal with more components may be implemented.

The wireless communication unit 210 may include one or more modules that enable wireless communication between the user terminal 200 and the wireless communication system or between the user terminal 200 and a network in which the user terminal 200 is located. For example, the wireless communication unit 210 may include a mobile communication module 211 for transmitting and receiving wireless signals with at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The A / V input unit 220 is for inputting an audio signal or a video signal, and may include a camera 221 and a microphone 222. The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video call mode or the imaging mode. The processed image frame may be displayed on the output unit 240.

The image frame processed by the camera 221 may be stored in the memory 250 or transmitted to the outside through the wireless communication unit 210. The microphone 222 receives an external sound signal by a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data can be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 211 and output when the voice data is in the communication mode.

The user input unit 230 may generate input data for controlling the operation of the terminal by the user, and may generate a terminal operation control signal according to a user input such as a video call service request or a sharing service request.

The output unit 240 is to generate an output related to visual, auditory, or tactile, and may include a display unit 241, a sound output module 242, and the like.

The display unit 241 displays (outputs) information processed by the user terminal 200. For example, when the user terminal is in a call mode, a user interface (UI) or a graphic user interface (GUI) associated with a call is displayed, and when the video call mode or a shooting mode is taken, and / or a received image or UI, GUI Is displayed.

As another example, when the user terminal 200 is in the video call mode, the display unit 241 may be an image frame processed by the camera 221 or an image frame received from the outside through the wireless communication unit 210. Is displayed on one surface of the display unit, and an image frame having a changed resolution may be displayed according to a control signal of the controller 250.

The memory unit 250 may store a program for processing and controlling the control unit 260, and temporarily stores input / output data (for example, a phone book, a message, an audio, a still picture, a moving picture, etc.). It can also perform a function for.

The controller 260 typically controls the overall operation of the user terminal 200, for example, performs related control and processing for voice call, data communication, video call, and the like. In addition, the controller 260 checks the CPU load according to an operation performed through the multimedia module 261 and the user terminal 200 for storing / playing multimedia contents, and outputs an image frame to one surface of the display unit 241. And an image frame control unit 262 for adjusting the resolution of the image. The multimedia module 261 or the image frame controller 262 may be implemented in the controller 250 or separately from the controller 250.

Preferably, the controller 250 is one in which the user terminal 200 participates in the MS 113 or the video call through the sharing server 107 when the user terminal 200 requests a sharing service during a video call with another user. A multi-session processing function is performed so that multimedia content can be received from another user terminal (hereinafter referred to as a "terminal terminal").

More preferably, the controller 250 displays a counterpart picture frame received through a video call session established with the counterpart terminal on the screen, and a new session is established with the sharing server 107 or the MS 113. When the content to be shared is received through the new session, a data processing function, a screen processing (split) function, or a session processing function for displaying on the screen simultaneously with the data received through the video call session is performed.

Here, the image frame control unit 262 controls the resolution and size of the still image / picture frame obtained through the camera 221. That is, the image frame controller 262 reduces the resolution and size of data transmitted for the video call as the CPU load of the user terminal increases while screen division and multi-session processing are required when using the shared service during the video call. 260 may switch the camera mode from the video mode to the picture mode and control the total load.

As described above, a method of changing the resolution of the video call will be briefly described with reference to FIGS. 3 and 4.

3 is a flowchart illustrating an example of a process of changing a video call resolution when using a shared service among video call services according to an embodiment of the present invention.

In FIG. 3, the first user terminal corresponds to the host terminal managing the video call service, the second user terminal corresponds to the counterpart terminal, and the AS includes one or more ASs and corresponds to each user terminal.

Referring to FIG. 3, as the video call service between the first user terminal and the second user terminal proceeds, image frames having VGA resolution are exchanged for video call data through the mobile communication network (S301). The user terminals participating in the video call service share conf information in which a video call based on an integrated channel platform (SDP) is performed.

At this time, when a shared service request message (request-sharing message) is transmitted from any one of the user terminals (eg, the sharing subject terminal) participating in the video call service to the AS of the corresponding terminal (S302), the AS is confed to the shared server. The shared service request message is transmitted with the participation session information (S303). The shared service request message transmitted to the shared server by the AS includes a shared room initiation request and a request for creating a sharing room to be accessed by a user terminal using the shared service.

When the shared server provides the shared service, the shared server transmits a response message for the corresponding AS role shared service request based on the conf participation session information (S304).

Each AS receiving the response message transmits the shared service INFO message to the first user terminal and the second user terminal. Specifically, a sharing service response message (response-sharing message) is transmitted to the first user terminal that performs the sharing service request (S305), and a participation request message (invite) requesting to participate in the sharing service to the second user terminal. -sharing message) is transmitted (S306).

In the specification of the present invention, for the sake of simplicity, a shared service response message and a participation request message are described separately, but both messages can be accessed by a shared server from each user terminal. It can be interpreted as a message of the same type in that it includes session information (eg, shared room information, URL information, etc.).

Thereafter, the first user terminal and the second user terminal access the sharing server based on the shared session information, and perform a bilateral or multilateral multimedia content sharing while a web session is connected (S307).

Accordingly, the display unit of each user terminal performs multi-session processing and screen division processing while simultaneously performing video call processing and shared service processing.

In this case, the user terminal (eg, the participant terminal) of one side transmits a first UPDATE message requesting a first change of the resolution of the video call data when the shared service is entered during the video call to the counterpart terminal (S308). Preferably, the UPDATE message is accompanied by an SDP.

As an example of a resolution change request method, when data transmitted to the outside to perform a video call is generally VGA (Video Graphics Array) having a resolution of 640 × 480, QCIF (Quarter Common of 176 × 144 resolution when using a shared service during a video call) Intermediate Form).

When receiving an acceptance message (response message) for the resolution change from another user terminal that has received the resolution change request message (S309), each user terminal displays the camera of each user terminal in the Video mode based on the resolution change signal of the video call. By switching to the mode, the data to be transmitted to the video call is changed from VGA (H.264) to QCIF (H.263) (S310), and video call data according to the changed resolution is transmitted and received (S311).

Subsequently, each user terminal determines whether or not to change or maintain the resolution by real-time or a predetermined period of time by checking the increase or decrease of the CPU load according to the progress of the video call and sharing service (S312), and the resolution change / A second UPDATE message requesting whether to maintain it may be transmitted (S313).

For example, the CPU load of each user terminal varies according to multimedia content (eg, file, video, web information, etc.) to be shared between terminals through a sharing service. Therefore, the user terminal checks the CPU load according to the shared service during the video call and maintains the resolution with the QCIF changed under a predetermined resolution change condition, or the Common Intermediate Form (CIF) of 352 × 288 resolution, or 4CIF (Common Intermediate) of 704 × 576 resolution. Form), VGA can be requested to change. In addition, when the shared service is completed, the user terminal may change the video call data back to VGA.

Thereafter, each user terminal may similarly receive a response message for the second UPDATE message (S314), perform a second resolution change according to the second UPDATE message (S315), and proceed with a video call with the changed resolution (S316). ).

As the shared service progresses, steps S312 to S316 may be repeated until the shared service is completed.

The embodiment of the present invention described above with reference to FIG. 3 is illustrated to help understand the description. The present invention is not necessarily limited to the above-described embodiments. For example, as the video call and the sharing service are used using terminals having different specifications, the optimal resolution condition may be different from the load increase rate and load amount of each user terminal. It may be implemented to change the resolution based on this maximum surging terminal first. Alternatively, the video call service may be implemented based on a resolution requested by a plurality of user terminals.

4 is a diagram illustrating an example of a video call resolution changing algorithm when a shared service is used among video call services in a user terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the user terminal activates a predetermined video call application and performs a video call with the 'party terminal' participating in the video call service (S401). Start (S402).

At the start of the shared service, the user terminal performs a first resolution change of changing video call data from VGA to QCIF according to a preset condition (S403).

Thereafter, the user terminal measures the CPU load in a predetermined period or real time according to the progress of the shared service (S404), and compares the measured CPU load with a predetermined reference value to determine whether to change or maintain the resolution (S405).

For example, if the CPU load is increased by 80% or more according to the use of the shared service, the video call data of the QCIF changed in the previous step (S403) is maintained (S406). If the CPU load is increased by less than 80%, the preset resolution is changed. The secondary resolution change is performed based on the CPU load measured according to the condition (S407).

Table 1 shows an example of a predetermined condition for changing the resolution of the video call data in accordance with the CPU load ratio in the user terminal according to an embodiment of the present invention.

CPU load increase Video call data resolution Load increase ≥ 80% QCIF (176 × 144) 70% ≤ load increase <80% CIF (352 × 288) 60% ≤ load increase <70% 4CIF (704 × 576) Load increase <60% VGA (640 × 480)

As illustrated in Table 1, the CPU load increase amount varies depending on the multimedia content (eg, web share, file share, paint share, etc.) to be shared through the sharing service, and the total CPU load is set based on the increase amount. The resolution of the optimal video call can be determined at the line not exceeding the limit.

The CPU load is measured in a predetermined cycle or in real time until the shared service is completed during the video call, and the process of changing the resolution of the video call data is repeated according to the measured CPU load (S408).

If the shared service is terminated, the user terminal changes the video call data back to VGA to continue the video call service (S409).

5 is a diagram illustrating an embodiment in which a video call resolution is changed when a shared service is used among video call services in a user terminal according to an exemplary embodiment of the present invention.

5A illustrates an example in which an image frame 501 is output on one surface of a terminal display unit while a user terminal activates a predetermined video call application to perform a video call service with a counterpart terminal. In general, an image frame 501 outputted to a display unit during a video call is a VGA file photographed and processed by a camera of a terminal.

Subsequently, when the shared service application is activated on the video call application, the terminal display unit outputs the image frame 502 on one side and the shared service web page 503 on the other side, as shown in FIG. Handle the split operation. The terminal controls the camera of the terminal to switch to the picture mode by applying the predetermined resolution changing algorithm described above with reference to FIG. 4 as the sharing service progresses, and the image frame 502 is output to one of the QCIF / CIF / 4CIF files. Change the resolution of call data.

As such, by adaptively adjusting the resolution of video call data according to the use of the shared service on a method and system for additionally providing a shared service while using the video call service, the load rate of the terminal CPU can be reduced and the video call service performance can be improved. Can be.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments described in the present invention are not intended to limit the technical idea of the present invention but to explain, and the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

Claims (15)

Claims [1] A method for providing a video call service when using a sharing service that shares predetermined content among session initiation protocol (SIP) based video call services.
(a) requesting a sharing service for sharing predetermined content from any one of the first terminal and the second terminal in a state where a video call session between the first terminal and the second terminal is established;
(b) in the case of providing a sharing service according to the sharing service request, first changing a resolution of video call data transmitted during a video call between the first terminal and the second terminal; And
(c) the first terminal and the second terminal during the sharing service, measuring the CPU load and changing the second resolution of the video call data according to a preset resolution information table;
The resolution information table,
And the optimized resolution information of the video call data based on the CPU load fluctuating as the shared service progresses. The method of claim 1,
In the step (a)
The video call data transmitted / received between the first terminal and the second terminal corresponds to a video graphics array (VGA) form. The method of claim 1,
The step (b)
Transmitting a first UPDATE message requesting a resolution change of the video call data from one of the first terminal and the second terminal to another terminal having a video call session established; And
Changing the resolution of the video call data in the first terminal and the second terminal according to a response to the first UPDATE message from the other terminal. Way. The method according to claim 1 or 3,
The step (b)
And changing the video call data to a QCIF (Quarter Common Intermediate Form) form. The method of claim 1,
The step (c)
And measuring, by the first terminal and the second terminal, a CPU load in a predetermined period or in real time as the sharing service proceeds. The method of claim 5,
The step (c)
If the CPU load measurement value is more than a predetermined reference value,
And maintaining the resolution of the first changed video call data. The method of claim 5,
The step (c)
If the CPU load measurement value is less than a predetermined reference value,
And changing a second resolution of the video call data according to the resolution information table. The method of claim 7, wherein
The second resolution change step,
Transmitting a second UPDATE message requesting a resolution change of the video call data from one of the first terminal and the second terminal to another terminal having a video call session established; And
And changing the resolution of the video call data in the first terminal and the second terminal in response to the second UPDATE message from the other terminal. Way. The method according to claim 1 or 8,
The step (c)
And changing the video call data to any one of QCIF, CIF (Common Intermediate Form), 4CIF (Common Intermediate Form), and VGA according to the resolution information table. The method of claim 1,
And changing the video call data to VGA when the sharing service is terminated when the video call session between the first terminal and the second terminal is established. Way. In a terminal using a video communication service based on a Session Initiation Protocol (SIP) through a mobile communication network,
A camera for generating video call data to be transmitted to the other terminal as a predetermined video call application is activated;
A display unit configured to output video call data transmitted from the other terminal to one surface as the video call application is activated; And
When the video call application is activated includes a control unit for controlling the operation mode of the camera to adjust the resolution of the video call data,
The control unit,
When the shared service application sharing the predetermined content with the other terminal is activated while the video call session with the other terminal is established, the CPU load is measured and the resolution of the video call data is adjusted according to a preset resolution information table. ,
The resolution information table,
And the optimized resolution information of the video call data based on the CPU load which changes as the shared service progresses. 12. The method of claim 11,
The control unit,
And, when the shared service application is activated, controls to change the video call data to a QCIF (Quarter Common Intermediate Form) form. 13. The method according to claim 11 or 12,
The control unit,
Adaptive video call control to change the video call data to any one of QCIF, Common Intermediate Form (CIF), Common Intermediate Form (4CIF), and VGA based on the resolution information table as the shared service proceeds. Terminal. 12. The method of claim 11,
The control unit,
And control to change the video call data to VGA when the sharing service is terminated while the video call session is established with the other terminal. 12. The method of claim 11,
The control unit,
As the shared service application is activated,
The operation mode of the camera is controlled to switch from the video shooting mode to the picture shooting mode, and the output screen of the display is divided to output video call data received from the other terminal to one area and the shared service to another area. An adaptive video call terminal, which controls to output an associated web session.

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