KR20090084489A - Apparatus and method for video calling with portable terminal - Google Patents

Abstract

A video call method in a portable terminal and an apparatus thereof are provided to improve user's satisfaction by converting voice data received while a video call is being performed into text data. A wireless frequency unit(110) processes transmission and reception of video data and voice data corresponding to a video call. An audio processor(120) removes the output of received voice data during the video call by a character mode. A display unit(160) indicates text data together with video data. A controller(170) converts audio data received during the video call performance by the character mode into text data.

Description

Method and device for video call in mobile terminal {APPARATUS AND METHOD FOR VIDEO CALLING WITH PORTABLE TERMINAL}

The present invention relates to a mobile terminal having a video call function. In particular, the present invention relates to a mobile terminal capable of providing a video call using text data by converting voice data received during a video call into text data. A video call method and apparatus are provided.

With the continuous development of research and technology, terminals, especially mobile terminals, go beyond the functions of telephones for voice calls, such as digital cameras, alarm functions, short text messages, multimedia messages, and e-mails. It also provides various user convenience functions such as mail and infrared communication. In addition, the user-convenience functions provided in this way are being added more and more according to the needs of users and the development of technology.

Recently, among the functions provided for user convenience, there is a video call function that makes a call while looking at each other's appearances rather than a simple voice call only. Such a video call is made by simultaneously transmitting video data input through a camera or the like together with voice data input through a microphone. Such a video call can transmit a video data to a counterpart by using real-time video streaming technology, so that the call can be seen while watching each other. In addition, with the spread of 3G services, the number of users using video calls is gradually increasing.

In the case of such a video call, a voice call is possible while looking at each other's appearance, and the output of the voice data according to the voice call is provided at a higher output than during the voice data output during a normal voice call. For example, during a video call, the mobile terminal switches to speakerphone mode to provide the voice data.

Therefore, as the voice data of the other party is provided with high power through the speaker, it causes inconvenience to the user in a place where the voice call is inconvenient. For example, as voice data output by the speakerphone mode is transmitted not only to the user but also to other people around him, there is a disadvantage in that the confidentiality of the contents of the call is difficult to be guaranteed. That is, privacy protection is difficult as the contents of the call with the other party are disclosed in the video call.

Disclosure of Invention An object of the present invention is to provide a video communication method and apparatus for a mobile terminal, which can provide various types of video call methods, rather than a general video call method.

Another object of the present invention is to provide a video communication method and apparatus for a mobile terminal which can convert and provide received voice data into text data during a video call in the mobile terminal.

It is still another object of the present invention to provide a video communication method and apparatus for a mobile terminal that can independently provide or simultaneously provide a video call in a text mode and a voice mode during a video call in the mobile terminal.

The method according to an embodiment of the present invention for achieving the above object, in the mobile terminal having a video call function, the process of checking whether the text mode is activated when the video call event occurs, and by the text mode Converting the voice data received during the video call into text data; and outputting the text data together with the video data received in response to the video call.

A method according to an embodiment of the present invention for achieving the above object, in a mobile terminal having a video call function, the process of confirming the video call method is set when the video call event occurs, and the video call method is a character Converting the received voice data into text data when the mode is set, and processing a video call by the text data and video data; and video call by the received voice data and video data when the video call method is set to the voice mode. And converting the received voice data into the text data when the video call method is set to the voice mode and the text mode, and processing the video call by the text data, the voice data, and the image data. .

An apparatus according to an embodiment of the present invention for achieving the above object, in the portable terminal, and the radio frequency unit for transmitting and receiving video data and voice data corresponding to the video call by forming a communication channel with a wireless network and; The audio processing unit outputs the received voice data through the speaker during the video call in the voice mode, and removes the output of the received voice data during the video call in the text mode, and at least one application and user data necessary for the operation of the video call function. And a memory unit for buffering and providing voice data transmitted according to a video call, a camera unit for receiving and processing image data of a user during a video call, and at least one video call. Display image data and display text data together with the at least one image data. And a display unit to convert the received voice data into text data when performing a video call in the text mode, and output the text data together with the image data through any one of a pop-up frame and a text input frame. And a control unit for controlling the video call in the mode.

As described above, according to the video call method and apparatus of the mobile terminal proposed by the present invention, it is possible to improve the user's satisfaction by providing various types of video call methods other than the general video call method in the mobile terminal. In addition, the mobile terminal has an effect of maximizing the use and satisfaction of the user's mobile terminal by independently providing or simultaneously providing the video call in the text mode and the voice mode during the video call.

In addition, according to the present invention, by converting the received voice data into text data when providing a video call in the mobile terminal, there is an effect that can keep the contents of the call confidential.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only the parts necessary for understanding the operation according to the embodiment of the present invention will be described, it should be noted that the description of other parts will be omitted so as not to distract from the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as being limited to ordinary or dictionary meanings, but should be construed as meanings and concepts corresponding to the technical spirit of the present invention. And the embodiments described in the specification and the configuration shown in the drawings are only one of the most preferred embodiment of the present invention, not representing all of the technical idea of the present invention. Therefore, it should be understood that there may be various equivalents and modifications that can substitute for them at the time of the present application.

The present invention relates to a video call method and apparatus for a mobile terminal, and more particularly, to a video call method of a mobile terminal for converting and providing voice data transmitted from a counterpart mobile terminal into text data when performing a video call in the mobile terminal. And to an apparatus.

According to an embodiment of the present invention, when the video call in the text mode, the received voice data along with at least one video data (transmitted video data, received video data) is converted into text data and output to the display unit, and the video call in the voice mode is performed. Outputting at least one video data to a display unit and outputting received voice data to a speaker, and converting at least one video data, received voice data, and text data converted from the received voice data during a video call in text mode and voice mode. All can be provided.

Provided are a video call in a text mode and a video call in a voice mode, and a portable terminal implementing the same.

1 is a schematic block diagram of a portable terminal according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the mobile terminal 100 according to an embodiment of the present invention includes a radio frequency (hereinafter referred to as RF) unit 110, an audio processor 120, and an input unit 130. , A memory unit 140, a camera unit 150, a display unit 160, a controller 170, and the like.

Referring to FIG. 1, the RF unit 110 performs a wireless communication function of the mobile terminal 100. The RF unit 110 forms a communication channel with a wireless network to perform voice communication and data communication. The RF unit 110 may include an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying and downconverting a received signal. In particular, the RF unit 110 performs transmission and reception of video data and audio data in response to a video call.

The audio processor 120 plays an audio signal or transmits an audio signal generated from a microphone (MIC, Microphone) to the controller 160. The audio processor 120 converts an audio signal into an audible sound through a speaker SPK, and outputs the audio signal such as a voice received from the microphone MIC. That is, the audio processor 120 converts an analog voice signal input from the microphone MIC into a digital voice signal, or converts a digital voice signal into an analog voice signal and outputs the same through the speaker SPK. In particular, the audio processor 120 may omit the output of the voice data transmitted from the counterpart mobile terminal when the mobile terminal 100 operates in a text mode during a video call. That is, the audio processor 120 outputs the received voice data during the video call in the voice mode through the speaker under the control of the controller 170, and removes the output of the received voice data during the video call in the text mode. .

The input unit 130 receives various text information, and transmits a key signal input in connection with setting of various functions and function control of the mobile terminal 100 to the controller 160. The input unit 130 may be formed of any one or a combination of a touch pad, a keypad of a general key arrangement, and a QWERTY keypad according to the provision form of the mobile terminal 100. The input unit 130 may further include function keys such as a direction key, a volume key, and a hot key set to perform a specific function. In particular, the input unit 130 may provide a chat function by receiving a key signal by a user when performing a video call in an embodiment of the present invention.

The memory unit 140 stores at least one application, user data generated by a user, data according to the execution of the application, and the like, required for operating a function according to an embodiment of the present invention. In particular, the memory unit 140 may buffer and provide voice data transmitted according to a video call. Therefore, the memory unit 140 may include one or more buffers for temporarily storing data generated during application execution.

The application is an application for activating / deactivating a function for converting voice data transmitted from a counterpart mobile terminal into text data in response to a video call event, i.e., processing a mode switch between the voice mode and the text mode of the present invention, and performing a video call. The application may be an application for converting the voice data transmitted according to the text data into text data, an application for processing the text data to be converted to the display unit 160 according to a setting method, and output the text data. Here, the video call event may include an outgoing call event and an incoming call event for the mobile terminal 100 to make a video call with the counterpart mobile terminal. In the present invention, the video call event may include a case where a video call is established between the mobile terminal 100 and the counterpart mobile terminal by the outgoing call event or the incoming call event.

The camera unit 150 converts light (light) input through the camera lens into digital data through a sensor. The sensor may include a charge coupled device (CCD), a complementary metal-oxide semiconductor (CMOS), and the like. The camera unit 150 may include a camera sensor for converting an input optical signal into an electrical signal, and a signal processing unit for converting an analog image signal photographed from the camera sensor into digital data. The signal processor may be implemented as a digital signal processor (DSP). The camera sensor and the signal processor may be integrally implemented or may be separately implemented. The camera unit 150 may be implemented in one or more according to the provision form of the mobile terminal 100.

In addition, the mobile terminal 100 according to an embodiment of the present invention may be configured separately from the image processing unit, or may be included in at least one of the camera unit 150 and the display unit 160. The image processor processes screen data for displaying an image signal output from the camera unit 150. The image processor processes the image signal output from the camera unit 150 in units of frames, and outputs frame image data processed in units of frames according to the characteristics and size of the display unit 160. In addition, the image processing unit includes an image codec and performs a function of compressing the frame image data displayed on the display unit 160 in a set manner or restoring the compressed frame image data to original frame image data.

Particularly, when there is a character input / output request during a video call, the image processor of the present invention distinguishes and provides a video data frame for outputting image data and a text data frame (popup frame, character input frame) for outputting the character data. Can be. The image processor may include a frame buffer for storing image data input through the camera unit 150 and processed in units of frames and text data to be output through the text data frame. When the character data frame is generated, the text data frame may be synthesized and provided with the image data stored in the frame buffer. In the present invention, the image processing unit is included in at least one of the camera unit 150 and the display unit 160 to operate, and the description of the present invention will be omitted. Therefore, it is assumed that the camera unit 150 or the display unit 160 including the image processor processes the functions of the image processor.

The display unit 160 displays screen data generated during the execution of the application, and displays a user's key operation status and function setting information. In particular, the display unit 160 may display image data output from the camera unit 150 on a screen, and display image data received from a counterpart mobile terminal according to a video call on a screen. The display unit 160 may be implemented as a liquid crystal display (hereinafter, referred to as an LCD), and the LCD may be implemented using a touch screen method. When the LCD is implemented as a touch screen method, the LCD may be operated as an input unit.

The controller 170 controls the overall operation of the mobile terminal 100 and the signal flow between the blocks of the mobile terminal 100. The controller 160 may be configured between the components such as the RF unit 110, the audio processor 120, the input unit 130, the memory unit 140, the camera unit 150, and the display unit 160. Control signal flow. The controller 170 may include a data processor consisting of a codec and a modem.

In particular, the controller 170 controls the video call function of the present invention to convert the received voice data into text data and output the text data in a set output manner when performing the video call using the mobile terminal 100. . The controller 170 outputs the converted text data using a pop-up frame or controls output through the text input frame. In addition, the control unit 170 may activate / deactivate the video call method according to the text mode and the voice mode in response to a user request / setting, and further, the video call method according to the text mode and the voice mode according to the surrounding environment factors. You can also control it.

The controller 170 checks whether a function of the present invention ('text mode function', which is provided by converting voice data during a video call to text data) is activated when a video call event occurs, and a video call method according to whether the function is activated. To control. In addition, the controller 170 controls the mode switching between the text mode and the voice mode in response to the request event during the video call.

The controller 170 may remove the output of the received voice data when the mobile terminal 100 operates in a text mode during a video call. That is, the controller 170 may control the output of the voice data through the speaker according to the text mode and the voice mode. In addition, when the function of the present invention is set to support a text mode and a voice mode at the same time, the control unit 170 outputs the received voice data from the other mobile terminal through the speaker SPK and the received voice. Character data for converting data may be provided together through the display unit 160. That is, according to an embodiment of the present invention, the controller 170 may provide a voice mode and a text mode simultaneously.

The control unit 170 activates / deactivates a function for converting voice data transmitted from a counterpart mobile terminal into text data in response to a video call event, that is, between the voice mode and the text mode according to the present invention. A function activating unit 171 for processing the switching, a voice data converter 173 for converting the voice data transmitted according to the video call into text data, and a method of setting the converted text data to the display unit 160. And a text data processor 175 to process and output the data according to the processing. The video call event may include an outgoing call event and an incoming call event for the mobile terminal 100 to make a video call with the counterpart mobile terminal. In the present invention, the video call event may include a case where a video call is established between the mobile terminal 100 and the counterpart mobile terminal by the outgoing call event or the incoming call event.

In addition, the controller 170 of the present invention checks the video call method set when the video call event occurs, and in response to the result, converts the received voice data into the text data when the video call method is set to the text mode. The video call is processed by the text data and the video data. In addition, when the video call method is set to the voice mode, the video call is processed by the received voice data and the image data. Further, when the video call method is set to the voice mode and the text mode, the received voice data is converted into text data, and the video call by the text data, the voice data and the video data is processed.

Meanwhile, FIG. 1 illustrates a schematic configuration example of a mobile terminal 100 according to an embodiment of the present invention for convenience of description. However, the mobile terminal 100 of the present invention is not necessarily limited to this configuration. Therefore, the mobile terminal 100 of the present invention may further include components not mentioned above, such as a short range communication module, an electronic payment module, a digital broadcasting module, a battery module, and the like, according to a form of provision thereof. In addition, the mobile terminal 100 of the present invention may be excluded or replaced with other blocks in the above configuration depending on the form of the provision.

In the above, the configuration and operation of the control means and the portable terminal including the same according to an embodiment of the present invention have been described. Next, the video call method of the present invention performed by the mobile terminal will be described. However, the present invention is not limited to the contents described below, it should be noted that it can be applied to various embodiments based on the following embodiments.

2 is a flowchart illustrating a video call method in a portable terminal according to an embodiment of the present invention.

1 and 2, when a video call event occurs (step 201), the controller checks whether the function of the present invention is activated (step 203, step 205). That is, it is possible to check whether or not to activate the text mode function provided by converting the voice data during the video call into text data.

Next, when the controller recognizes that the text mode function is activated, the controller may notify the user of information on the set mode (text mode) (step 207). That is, the controller may notify that the text mode is set through an audio signal, a screen signal, or a combination thereof. The audio signal may include a voice signal, a beep sound, and the screen signal may include a message provided in a popup form.

Next, the controller notifies whether the text mode function is activated and then checks whether there is a mode switch request (step 209). If there is a mode switch request, the controller switches the text mode to the voice mode and processes a general video call in the voice mode (step 219). On the other hand, if there is no mode change request, the controller processes the video call in the text mode (step 211).

First, the control unit converts the received voice data from the counterpart mobile terminal into text data during the video call in the text mode (step 213), and then outputs the converted text data according to the set output method (step 215). ). In this case, the text data conversion may be performed using a text data conversion function after buffering the received voice data. Alternatively, the received voice data may be directly converted by the text data conversion function.

The text data conversion function may utilize a text to speech (TTS) function that converts voice data into text data. In addition, the output of the character data may be provided in various ways according to a setting method, which will be described with reference to FIGS. 3 to 4b to be described later.

Next, when the controller detects the mode switch request during the video call in the above-described text mode (step 217), the controller may switch the text mode to the voice mode and process the video call in the voice mode ( Step 219). When the video call is terminated by the user or the mobile terminal (step 221), the controller terminates the above-described operation. In addition, when the termination is not completed, the controller may perform a corresponding operation corresponding to the text mode or the voice mode (step 223). In this case, it is also possible to maintain the mode used at the end time and to apply the initial mode when the next video call event occurs.

On the other hand, if it is recognized in step 205 that the text mode function is deactivated, the user may be notified of information on the set mode (voice mode) (step 231). In other words, the controller may notify that the voice mode is set through an audio signal, a screen signal, or a combination thereof.

Next, the controller notifies the voice mode and checks whether there is a mode switch request (step 233). If there is a mode change request, the controller switches the voice mode to the text mode (step 237) and proceeds to step 211 to process the video call in the text mode. On the other hand, if there is no mode switch request, the controller processes the video call in the voice mode (step 235).

Meanwhile, although omitted in FIG. 2, the present invention provides the output of the received voice data along with the text data or removes the output of the received voice data according to a setting method when controlling a video call in the text mode. Only character data can be provided.

3 is a flowchart illustrating a text data output method when performing a video call according to an exemplary embodiment of the present invention, and FIGS. 4A and 4B illustrate screen examples according to the text data output method of the present invention.

3 to 4B, the controller may first check an output method set before outputting the text data (step 301).

First, if it is recognized in step 301 that the preset output method is a pop-up method, the controller generates a pop-up frame (step 303). The controller outputs the character data converted in the above-described step through the pop-up frame (step 305). In this case, the pop-up frame and text data output may be displayed for a predetermined set time, and the display may be removed from the screen when the set time expires. Also, the pop-up frame and / or text data may be updated correspondingly when the next text data is provided. An example of such a screen is shown in FIG. 4A.

As shown in FIG. 4A, reference numeral 410 represents an example of the pop-up frame, and may output text data (eg, “Hello”) obtained by converting received voice data through the pop-up frame 410. The pop-up frame 410 may be set in various pop-up shapes, such as a circle and a rectangle, and in particular, may be provided in the form of a speech bubble. The size of the pop-up frame 410 can be fixed by setting the displayed size as a default value, and the size of the pop-up frame 410 is automatically enlarged / corresponded to the size (number of characters, capacity, etc.) of the output text data. It may be provided reduced. In addition, the pop-up frame 410 may be automatically generated on one side of the screen by an application such as a face recognition technology so as not to overlap with the image data transmitted from the relative mobile terminal on the screen. In addition, the pop-up frame 410 may recognize the image data by using the above-described face recognition technology, and may be displayed in close proximity to the user's face of the image data. The pop-up frame 410 may be processed in a transparent manner and provided in the form of an overlay on the frame of the image data, so as to secure a time for the image data.

Next, if it is recognized in step 301 that the preset output method is a general method, the controller generates a text input frame (step 313). The controller outputs the character data converted in the above-described step through the character input frame (step 315). In this case, the text input frame and the text data output may be displayed for a predetermined set time, and the display may be removed from the screen when the set time expires. Also, the text input frame and / or text data may be updated correspondingly when the next text data is provided. An example of such a screen is shown in FIG. 4B.

As illustrated in FIG. 4B, reference numeral 430 denotes an example of the text input frame, and may output text data (eg, “Hello”) obtained by converting received voice data through the text input frame 430. have. The text input frame 430 may be fixed because the displayed size is set as a default value, and the size of the text input frame 430 is automatically adjusted according to the size (number of characters, capacity, etc.) of the output text data. It may be provided in an enlarged / reduced manner. In addition, the character input frame 430 may be displayed on any one of the top, bottom, left and right of the screen.

On the other hand, as described above, in the embodiment of the present invention has been described with the video call method according to the text mode and voice mode, the present invention is not necessarily limited thereto. Therefore, according to the present invention, it is a matter of course that the video call can be provided by simultaneously supporting the text mode and the voice mode and providing the voice data and the text data according to the setting method. In this case, the controller may provide the image data and the audio data transmitted from the counterpart portable terminal through the display unit and the speaker, and convert the voice data into text data and provide the image data to the display unit together with the image data.

In addition, the embodiment of the present invention has been described with respect to the video call method through the text mode according to whether the function of the present invention is activated. In addition, according to an embodiment of the present invention, the controller may adaptively control the switching between the text mode and the voice mode in response to the surrounding environment to provide a video call. For example, the controller may automatically control the video call mode to the text mode when it determines that the surrounding environment is external, and automatically control the video call mode to the voice mode when it determines that it is internal. This determination may be made through measurement of ambient noise, ambient brightness, and the like. To this end, the mobile terminal of the present invention may further include a sensor for measuring noise or measuring brightness.

In addition, the embodiment of the present invention may further include a function of notifying the counterpart portable terminal of the mode information set in the portable terminal or the mode information changed by the mode switching when the video call is performed. The notification may be delivered using a designated message when a video call event occurs and when all transitions are made.

As described above, in the detailed description of the present invention has been described with respect to specific embodiments, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

1 is a schematic block diagram of a portable terminal according to an embodiment of the present invention;

2 is a flowchart illustrating a video call method in a mobile terminal according to an embodiment of the present invention;

3 is a flowchart illustrating a method of outputting character data when performing a video call according to an embodiment of the present invention;

4A and 4B are diagrams showing screen examples according to the character data output method of the present invention.

Claims (24)

In a mobile terminal having a video call function, Checking whether the text mode is activated when a video call event occurs; Converting the received voice data into text data when performing the video call in the text mode; And outputting the text data together with the image data received corresponding to the video call. The method of claim 1, And the text data is generated by a text to speech (TTS) function for converting voice data into text data. The method of claim 2, And the text data is output through any one of a pop-up frame and a text input frame. The method of claim 3, The pop-up frame is a video call method in a mobile terminal, characterized in that provided as an overlay on the image data in a pop-up of the circular and rectangular form. The method of claim 1, And after checking whether the text mode is activated, notifying that the set video call mode is a text mode when the text mode function is activated. The method of claim 5, Checking whether the text mode is activated, The method may further include determining a surrounding environment of the mobile terminal. And controlling the switching between the text mode and the voice mode in response to the surrounding environment. The method of claim 1, Converting from the text mode to the voice mode when a mode switch request is detected during the video call by the text mode; And performing a video call in the voice mode. The method of claim 7, wherein And outputting the voice data received through the output unit during the video call in the voice mode. The method of claim 1, Determining a video call execution method before checking whether the text mode is activated; When the video call is performed in the text mode and the voice mode, the mobile terminal provides both the text data in the text mode and the voice data in the voice mode together with the received video data during the video call. Video call method. The method of claim 1, And removing the speaker output of the voice data when performing the video call in the text mode. In a mobile terminal having a video call function, Checking a video call method set when a video call event occurs; Converting received voice data into text data when the video call method is set to a text mode, and processing a video call by the text data and video data; Processing a video call using received voice data and video data when the video call method is set to a voice mode; And converting the received voice data into the text data when the video call method is set to the voice mode and the text mode, and processing the video call by the text data, the voice data, and the image data. How to offer a video call in. The method of claim 11, And the text data is generated by a text to speech (TTS) function for converting voice data into text data. The method of claim 12, And the text data is output through any one of a pop-up frame and a text input frame. The method of claim 13, The pop-up frame is a video call method in a mobile terminal, characterized in that provided as an overlay on the image data in a pop-up of the circular and rectangular form. The method of claim 11, And confirming a set video call method when the video call event occurs and notifying a setting mode according to a result of the confirmation. The method of claim 11, And removing the speaker output of the voice data when performing the video call in the text mode. In the mobile terminal, A radio frequency unit for forming a communication channel with a wireless network and processing transmission and reception of video data and audio data corresponding to a video call; An audio processor for outputting received voice data through a speaker during a video call in a voice mode, and removing output of received voice data during a video call in a text mode; A memory unit for storing at least one application and user data necessary for operation of a video call function and buffering and providing voice data transmitted according to a video call; A camera unit for receiving and processing image data of a user when performing a video call; A display unit which displays at least one image data according to a video call, and displays text data together with the at least one image data; When performing a video call in the text mode, the received voice data is converted into text data, and the text data is output together with the image data through any one of a pop-up frame and a text input frame. A mobile terminal comprising a control unit for controlling a call. The method of claim 17, wherein the control unit Converting received voice data into text data during a video call in text mode, and processing a video call by the text data and video data; Processing video calls by received voice data and video data during video calls in voice mode; A mobile terminal characterized by converting received voice data into text data during a video call in the voice mode and text mode, and processing a video call by the text data, the voice data and the video data. The method of claim 18, wherein the control unit A function activation unit for processing mode switching between voice mode and text mode in response to a video call event; A voice data converter for converting voice data transmitted according to a video call into text data; And a character data processing unit for processing and outputting the converted character data to the display unit according to a setting method. The method of claim 18, wherein the control unit And a text to speech (TTS) function for converting voice data into text data. The method of claim 18, wherein the control unit The mobile terminal, characterized in that for controlling the notification of the mode by checking the set video call mode when the video call event occurs. The method of claim 18, wherein the control unit And a pop-up frame having circular and square shapes as an overlay on the image data. 18. The method of claim 17, wherein the application An application that handles mode switching between voice mode and text mode, An application for converting voice data transmitted according to a video call into text data; And an application for processing and outputting the converted character data according to a setting method. The method of claim 17, wherein the display unit And outputting the text data through a pop-up frame or a text input frame overlaying the text data on the frame of the image data.

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