Patent Publication Number: US-2020302935-A1

Title: Display apparatus capable of releasing a voice input mode by sensing a speech finish and voice control method thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation Application of U.S. application Ser. No. 16/514,028, filed on Jul. 17, 2019, which is a Continuation Application of U.S. application Ser. No. 16/166,898, filed on Oct. 22, 2018, and issued as U.S. Pat. No. 10,395,657 on Aug. 27, 2019, which is a Continuation Application of U.S. application Ser. No. 14/267,510, filed on May 1, 2014, and issued as U.S. Pat. No. 10,140,990 on Nov. 27, 2018, which claims priority from Korean Patent Application No. 10-2013-0122131, filed on Oct. 14, 2013, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety. 
    
    
     BACKGROUND 
     Field 
     Apparatuses and methods consistent with the exemplary embodiments relate to a display apparatus and a voice control method thereof, and more particularly, to a display apparatus capable of releasing a voice input mode by sensing a speech finish time of a user, and a voice control method thereof. 
     Description of the Related Art 
     Due to the development of electronic technology, diverse types of electronic devices have been developed and have become widespread. Also, diverse functions of electronic devices have been provided. 
     Accordingly, efforts have continued to develop interaction technology that enables users to use electronic devices more conveniently. One of them is voice control technology which performs control operations using the user&#39;s voice. 
     Recently, diverse devices such as televisions, mobile phones, and navigation devices have been implemented with functionality to recognize the user&#39;s speech and to perform control operations corresponding to the speech. 
     However, there are several difficulties in applying voice control technology to devices and using the voice control technology in real life. For example, while the user is speaking to a device, ambient noise or conversation may inadvertently be input, thereby causing the device to malfunction. 
     Therefore, there is a need for a method of more efficiently and precisely performing voice control. 
     SUMMARY 
     Exemplary embodiments overcome the above disadvantages and other disadvantages not described above. Also, an exemplary embodiment is not required to overcome the disadvantages described above, and an exemplar) embodiment may not overcome any of the problems described above. 
     One or more exemplary embodiments provide a display apparatus capable of releasing a voice input mode by determining whether the user&#39;s speech has finished, and a voice control method thereof. 
     According to an aspect of an exemplary embodiment, there is provided a voice control method including converting a voice of a user into text in response to the voice being input during a voice input mode; performing a control operation corresponding to the text; determining whether speech of the user has finished based on a result of the performing the control operation; awaiting input of a subsequent voice of the user during a predetermined standby time in response to determining that the speech of the user has not finished; and releasing the voice input mode in response to determining that the speech of the user has finished. 
     In the determining operation, in response to an information selected in at least one search process performed in accordance with the voice of the user or the subsequent voice of the user being displayed, it may be determined that the user&#39;s speech has finished. 
     In the determining operation, in response to a multimedia content being reproduced, a determination may be made that the speech of the user has finished. 
     The voice control method may further include displaying a graphic object corresponding to the voice input mode while the voice input mode is maintained. 
     According to an aspect of another exemplary embodiment, there is provided a voice receiver configured to receive a voice of a user in a voice input mode; and a controller configured to perform a control operation corresponding to the voice of the user received by the voice receiver, wherein the controller is configured to determine whether speech of the user has finished based on a result of performing the control operation, await input of a subsequent voice of the user for a predetermined standby time in response to determining that the speech of the user has not finished, and release the voice input mode in response to determining that the speech of the user has finished 
     The display apparatus may further include a display configured to display a graphic object corresponding to the voice input mode while the voice input mode is maintained. 
     In response to the voice of the user being input, the controller may display on one side of the graphic object, text corresponding to the voice of the user. 
     In response to the voice input mode being released, the controller may change the graphic object into a form which represents a release from the voice input mode. 
     The controller may perform at least one search in accordance with the voice of the user or the subsequent voice of the user, display search results on the display, and determine that the user&#39;s speech has finished in response to one of the search results being selected and information regarding the selected search result is displayed. 
     The controller may determine that the speech of the user finishes in response to the control operation being an operation to play back multimedia contents. 
     The display apparatus may further include a communicator configured to communicate with a voice recognition apparatus which converts the voice of the user into text. The controller may transmit the voice of the user to the voice recognition apparatus through the communicator and in response to the voice recognition apparatus converting the voice of the user into the text, the controller may receive the text and may perform the control operation which corresponds to the text. 
     The display apparatus may further include a communicator configured to communicate with a server apparatus which performs a search. The controller may transmit text corresponding to the voice of the user to the server apparatus, receive search results regarding the text from the server apparatus, and display the search results on the display, and in response to a speech finish signal being received from the server apparatus, the controller may determine that the user&#39;s speech has finished, and release the voice input mode. 
     The display apparatus may further include a communicator configured to communicate with a voice recognition apparatus which converts the user&#39;s voice into text and to communicate with a server apparatus which performs a search using the text. 
     The controller may transmit the voice of the user to the voice recognition apparatus, receive the text from the voice recognition apparatus, transmit the text to the server apparatus through the communicator, receive search results from the server apparatus, and display the search results on the display. In response to a speech finish signal being received from the server apparatus, the controller may determine that the user&#39;s speech has finished, and release the voice input mode. 
     According to an aspect of another exemplary embodiment, there is provided a server apparatus including a server communicator configured to receive text corresponding to a voice of the user from a display apparatus which operates in a voice input mode, a database configured to store contents information, a server controller configured to search the database for the received text, transmit searched contents information to the display apparatus, and transmit a speech finish signal to the display apparatus in response to a determination that the speech of the user has finished, based on the search results. 
     In the voice control system according to the exemplary embodiments, the voice input mode may be automatically released by determining whether the speech of the user has finished. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and/or other aspects will be more apparent by describing certain exemplary embodiments with reference to the accompanying drawings, in which: 
         FIG. 1  is a block diagram of a configuration of a display apparatus according to an exemplary embodiment; 
         FIG. 2  is a flow chart of a voice control method according to an exemplary embodiment; 
         FIG. 3  illustrates a voice control process of the display apparatus; 
         FIGS. 4 and 5  illustrate methods for determining whether or not the user&#39;s speech has finished; 
         FIG. 6  illustrates a configuration of a voice control system according to an exemplary embodiment: 
         FIG. 7  is a block diagram of a configuration of a display apparatus according to another exemplary embodiment; 
         FIG. 8  is a block diagram of a configuration of a server apparatus according to an exemplary embodiment; and 
         FIG. 9  is a flow chart of a voice control supporting method of a server apparatus according to an exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Certain exemplary embodiments will now be described in greater detail with reference to the accompanying drawings. 
     In the following description, same drawing reference numerals are used for the same elements even in different drawings. The matters defined in the description, such as detailed construction and elements, are provided to assist in a comprehensive understanding. Thus, it is apparent that the exemplary embodiments can be carried out without those specifically defined matters. Also, well-known functions or constructions are not described in detail since they would obscure the exemplary embodiments with unnecessary detail. 
       FIG. 1  is a block diagram of a configuration of a display apparatus according to an exemplary embodiment. With reference to  FIG. 1 , the display apparatus  100  may include a voice receiver  110 , e.g., an inputter, and a controller  120 . 
     The voice receiver  110  receives a voice of a user (user&#39;s voice). The voice receiver  110  may include a microphone to receive the user&#39;s voice directly or may receive the user&#39;s voice indirectly from a remote controller including a microphone. 
     The controller  120  performs a control operation corresponding to the user&#39;s voice input through the voice receiver  110 . More specifically, in response to the user&#39;s command input to the voice receiver  110  being a predetermined voice command, the controller  120  may perform an operation corresponding to the voice command. For example, if the display apparatus  100  is a television, voice commands regarding diverse operations, such as “turn on” or “turn off”, “turn up the volume” or “turn down the volume”, and “change the channel” may be designated and stored. In response to such a voice command being input, the controller  120  performs operation matched to the voice command. 
     In response to the user&#39;s voice being text which is not predetermined, the controller  120  performs an operation corresponding to the text. In other words, the display apparatus  100  may analyze the user&#39;s voice and provide interactive service in response to the user&#39;s voice. For example, in response to the user saying “actor ABCD”, the display apparatus  100  may search for diverse information, including the text “actor ABCD” and may display the result of the search. 
     The controller  120  may analyze the user&#39;s voice and convert the user&#39;s voice into text, by itself. Alternatively, in another exemplary embodiment, the user&#39;s voice may be transmitted to an external server apparatus (not shown), and the external server apparatus may convert the user&#39;s voice into text and transmit the text to the display apparatus  100 . The server apparatus that converts voice into text may be referred to as a voice recognition apparatus, for purposes of convenience of description. The exemplary embodiment in which voice is converted into text by the voice recognition apparatus will be described later in greater detail. The controller  120  may enter a voice input mode by the user&#39;s selection. In the voice input mode, the controller  120  may activate the voice receiver  110  to receive the user&#39;s voice. After the user&#39;s voice is received and a corresponding control operation is performed, the controller  120  determines whether the user&#39;s speech has finished according to the result of the performed control operation. That is, the controller determines whether or not a speech finish state has occurred. The speech finish state refers to a state that is not expected to use voice control any longer. 
     That is, the controller  120  may determine whether the user&#39;s speech has finished, according to characteristics of the control operation performed based on the user&#39;s voice. For example, users usually speak to the display apparatus  100  to search for information or to execute a function that they want. Accordingly, when the information that the user wants is finally searched or when the function that the user wants is executed, the user may not speak during a predetermined period of time. In consideration of this feature, in response to the user selecting information in this information search process and thus the information is displayed, the controller  120  may determine that the user&#39;s speech has finished, e.g., that the user has finished speaking. In addition, in response to an application being executed or multimedia contents being reproduced, and thus an application screen or contents screen being displayed, the controller  120  may determine that the user&#39;s speech has finished. 
     As a result, in response to the controller  120  determining that the user&#39;s speech has finished, the controller  120  immediately releases or ends the voice input mode without waiting during a standby time. Therefore, the possibility of malfunction by ambient noise during the unnecessary standby time may be cut off. 
     However, in response to the controller  120  determining that the user&#39;s speech has not finished, the controller  120  awaits a user&#39;s subsequent speech during a predetermined standby time. In response to the user&#39;s subsequent speech being input during a predetermined standby time, the controller  120  performs a control operation in accordance with the user&#39;s subsequent speech, and determines again whether the user&#39;s speech has finished. In response to determining that the user&#39;s speech has not finished, the controller  120  resets the standby time and awaits a user&#39;s further speech during the new standby time. 
     In other words, once the voice input mode is selected, the controller  120  maintains the voice input mode until the user completes speaking, even when the voice input mode is not selected again. Accordingly, the user may not always select the voice input mode whenever voice control is needed. 
     In  FIG. 1 , the display apparatus  100  is described to perform voice control independently, but may perform voice control in line with an external server apparatus. 
       FIG. 2  is a flow chart of a voice control method according to an exemplary embodiment. With reference to  FIG. 2 , in response to the display apparatus  100  entering the voice input mode (S 210 ), the display apparatus  100  awaits input of the user&#39;s voice (S 220 ). As described above, the user&#39;s voice may be input through a microphone provided in a main body of the display apparatus  100  or may be input through a microphone provided in a remote controller, or in an external apparatus and be transmitted to the display apparatus  100 . 
     In response to the user&#39;s voice being input (S 230 ), the display apparatus  100  converts the voice into text (S 240 ). Converting the voice into the text may be performed by the display apparatus  100 . In another exemplary embodiment, in response to the display apparatus  100  transmitting the user&#39;s voice to an external server apparatus, that is, a voice recognition apparatus, the voice recognition may convert the user&#39;s voice into text and transmit the text to the display apparatus  100 . 
     The display apparatus  100  performs a control operation corresponding to the text (S 250 ). For example, in response to the user saying at least one keyword, the display apparatus  100  may search for diverse information which includes the keyword and display the search results. In addition, in response to the user saying at least one keyword and command, the display apparatus  100  may access an application corresponding to the command and input the keyword to the application. For example, in response to the user saying a name of contents and a command to play back the contents (for example, “play back” or “reproduce”), the display apparatus  100  runs a contents playback application and inputs the name of the contents to the contents playback application so that the contents corresponding to the name may be reproduced. 
     After performing the control operation, the display apparatus  100  determines whether the user has finished speech based on contents of the control operation (S 260 ). This determination may be performed by the display apparatus  100  or may be performed by an external server apparatus and be transmitted to the display apparatus  100 . 
     A method for determining whether the user&#39;s speech has finished may be implemented diversely. For example, in response to an information selected in at least one search process performed in accordance with the user&#39;s voice or the user&#39;s subsequent voice being displayed, it may finally be determined that the user&#39;s speech has finished. 
     Otherwise, in response to a multimedia content selected by the user&#39;s voice or subsequent voice being reproduced, it may be determined that the user&#39;s speech has finished. 
     Examples of the specific determination method will be described later with reference to the drawings. 
     In response to determining that the user&#39;s speech has finished, the display apparatus  100  releases or ends the voice input mode (S 290 ). In response to the display apparatus  100  not being in the voice input mode, voice control cannot be performed until the user again selects the voice input mode. 
     In response to determining that the user&#39;s speech has not finished, the display apparatus  100  resets the standby time (S 280 ), maintains the voice input mode during the standby time, and awaits the user&#39;s voice (S 220 ). The standby time may be set by the manufacturer of the display apparatus  100  or by the user. For example, the standby time may be set to 30 seconds. 
     In response to the standby time having elapsed without input of the user&#39;s voice (S 270 ), the display apparatus  100  may release the voice input mode. 
     Although not shown in  FIG. 2 , displaying a graphic object corresponding to the voice input mode during the voice input mode may be further included. The form and role of the graphic object will be described later, in detail. 
       FIG. 3  illustrates a voice control process of the display apparatus  100 . With reference to  FIG. 3 , the display apparatus  100  may further include a display  130 . 
     The display  130  may display contents selected by the user. In addition, in the voice input mode, the display  130  displays the graphic object  320  corresponding to the voice input mode. While the voice input mode is maintained, the graphic object  320  may be constantly displayed. In  FIG. 3 , the graphic object  320  of a microphone shape is displayed on one edge of the screen, but the shape and position of the graphic object  320  is not limited thereto. 
     In response to the user&#39;s voice being input, the controller  120  displays on the display  130  text corresponding to the user&#39;s voice. With reference to  FIG. 3 , a text display area  310  may be provided on one side of the graphic object  320 . 
     Accordingly, the text corresponding to the user&#39;s voice may be displayed in the text display area  310 . The user may check whether the user&#39;s speech is correctly recognized by identifying the text displayed in the text display area  310 . 
     Under the text display area  310 , a result display area  330  is provided to display the results of the control operation corresponding to the user&#39;s voice. The controller  130  displays in the result display area  330  the results of the control operation corresponding to the user&#39;s voice. 
       FIG. 3  shows an example in which the user  10  says “AAA what time”. In this case, the controller  120  searches using keywords “AAA” and “what time”. The controller  120  displays the search results  330  in the result display area  330 . 
     Based on the search results, the controller  120  determines whether the user&#39;s speech has finished. In response to determining that the user&#39;s speech has finished, the controller  120  releases the voice input mode. 
       FIGS. 4 and 5  illustrate methods of determining whether or not the user&#39;s speech has finished.  FIG. 4  illustrates a case where the user says a keyword, “AAA”. The controller  120  may search for “AAA” and display search results in the result display area  330 . In  FIG. 4 , a plurality of search results are displayed. Since the searched items are plural, the controller  120  may determine that the user&#39;s speech has not finished, and may reset the standby time to the initial value. 
     In this state, the user may select one from among the displayed items, that is, searched results by inputting a subsequent speech. In  FIG. 4 , the user may say an index (i.e., first, second, third . . . ) by which the search results are arranged or may say a name from the search results. In response to the user&#39;s speech, such as “first item” or “AAA NEWS REPLAY”, being input, the controller  120  performs an additional search based on the input user&#39;s speech. Subsequently, the controller  120  displays “AAA NEWS REPLAY” in the text display area  310 , and displays the search results for “AAA NEWS REPLAY” in the result display area  330 . In this case, since a plurality of search results are searched and displayed in the list format, the controller  120  may determine that the user&#39;s speech has not finished. The controller  120  resets the standby time to the initial value again, and awaits subsequent speech. 
     In response to the user saying “third item” or “AAA NEWS on 9/3” as shown in  FIG. 4 , the controller  120  plays back multimedia contents corresponding to the item selected by the user&#39;s speech. In  FIG. 4 , the multimedia contents, AAA NEWS on September 3, is played back so that the playback screen  410  may be displayed. In response to a control operation executed by the user&#39;s voice or subsequent voice being multimedia contents playback operation, the controller  120  determines that the user&#39;s speech has finished. 
     Accordingly, the controller  120  releases the voice input mode and changes the graphic object into a form  340 ) which represents a release from the voice input mode. The graphic object may be deleted after a predetermined period of time from the release from the voice input mode. 
     In response to the contents that the user wants being output, the display apparatus  100  immediately releases the voice input mode, and does not display a user interface (UI) for the voice input mode. Accordingly, the inconvenience of the UI that may hide contents during the standby time, even when the contents is selected and output may be solved. 
       FIG. 5  illustrates another method for determining whether the user&#39;s speech has finished. In  FIG. 5 , the user says “AAA what time”. 
     The controller  120  searches based on the user&#39;s speech, and displays search results in a list format in the result display area  330 . The user may input a subsequent speech and the controller may perform an additional search in the search results. In  FIG. 5 , the first item and the second item are sequentially selected. 
     In response to information of the lowest level being selected in a hierarchical tree of information, the controller  120  may display the corresponding information. In  FIG. 5 , “AAA 10 O&#39;CLOCK NEWS INFORMATION” is information related to the lowest level. When “AAA 10 O&#39;CLOCK NEWS INFORMATION” is selected by the user&#39;s subsequent speech, the controller  120  displays a detailed information screen  510  corresponding to the selected item. 
     In response to the information related to the lowest level being selected, the controller  120  determines that the user&#39;s speech has finished. In other words, in response to at least one search being performed by the user&#39;s speech or subsequent speech, one of the search results being selected, and information regarding the selected search result being displayed, the controller  120  determines that the user&#39;s speech has finished. Accordingly, the controller  120  releases the voice input mode. 
     In response to the voice input mode being released, the controller  120  changes the graphic object  320  into another shape of graphic object  340  which represents a release from the voice input mode. 
     In another example, in response to an application being selected, when an application screen is displayed, and when the lowest function on the application screen is selected and executed, the controller  120  may determine that the user&#39;s speech has finished. 
     In  FIGS. 4 and 5 , the search results are displayed in a vertically arranged list, but may be provided in diverse methods according to the form and size of the display  130 . For example, the search results may be horizontally displayed. In addition, the search results may be displayed in diverse forms such as captured images, thumbnail images, and icons as well as text. 
     As described above, the controller  120  may perform a control operation in accordance with the user&#39;s speech, and automatically determine whether the user&#39;s speech has finished, based on the contents of the user&#39;s speech and the contents of the control operation. According to the results of the determination, the controller  120  automatically releases the voice input mode, thereby preventing malfunction. In addition, the inconvenience of the UI of the voice input mode that may cover the screen may be prevented as described above. As a result, unnecessary waste of resources may be reduced. 
     In the above exemplary embodiments, the display apparatus  100  converts the user&#39;s voice into text, searches for the text, and understands the user&#39;s intention. However, some of these operations may be performed by an external server apparatus. In another exemplary embodiment, a voice control system including at least one server apparatus and a display apparatus may implement the aforementioned voice control method. 
       FIG. 6  illustrates a configuration of a voice control system according to an exemplary embodiment. With reference to  FIG. 6 , the voice control system  1000  may include a voice recognition apparatus  700 ), a server apparatus  800 , and a display apparatus  100 . 
     An interactive client module (not shown) which may be linked with the voice recognition apparatus  700  and the server apparatus  800  may be installed in the display apparatus  100 . In response to the display apparatus  100  entering the voice input mode, the controller  120  runs the interactive client module and performs a control operation corresponding to an input voice. More specifically, in response to the user&#39;s voice being input, the controller  120  may transmit the user&#39;s voice to the voice recognition apparatus  700 . 
     The voice recognition apparatus  700  is a kind of server apparatus that converts the user&#39;s voice received from the display apparatus  100  into text. 
     The voice recognition apparatus  700  may recognize a speech using at least one of diverse recognition algorithms such as a dynamic time warping method, a hidden Markov model, and a neural network, and convert the recognized speech into text. For example, using the hidden Markov model, the voice recognition apparatus  700  models temporal change and spectrum change of the user&#39;s speech, detects a similar word from a pre-stored language database, and outputs the detected word as text. 
     The display apparatus  100  receives the text from the voice recognition apparatus  700 , and performs a control operation corresponding to the text. When the display apparatus  100  has a voice command corresponding to the text among the predetermined voice commands, the display apparatus  100  performs operation corresponding to the voice command. However, when the display apparatus  100  does not have any voice command corresponding to the text among the predetermined voice commands, the display apparatus  100  transmits the text to the server apparatus  800 . 
     The server apparatus  800  searches its database or other server apparatuses for information corresponding to the text. The server apparatus  800  feeds the search results back to the display apparatus  100 . 
     The display apparatus  100  displays the search results. The display apparatus  100  can understand the intention of the user&#39;s speech based on the search results as described above. Accordingly, when the user finishes speaking, the display apparatus  100  may automatically release the voice input mode. 
     In another exemplary embodiment, the server apparatus  800  may determine whether the user&#39;s speech has finished. In other words, the server apparatus  800  provides search results searched in accordance with the user&#39;s voice or subsequent voice, and in response to the user selecting information of a lower level and identifying a screen regarding the information or in response to the user selecting contents so that the selected contents are played back, the server apparatus  800  may determine that the user&#39;s speech has finished. Accordingly, the server apparatus  800  may transmit a speech finish signal to the display apparatus  100 . 
     The display apparatus  100  receives the speech finish signal from the server apparatus  800  and releases the voice input mode. 
       FIG. 7  is a block diagram of a configuration of the display apparatus  100  used in the voice input system  1000  as shown in  FIG. 6 . With reference to  FIG. 7 , the display apparatus  100  may include a voice receiver  110 , e.g., an inputter, a controller  120 , a display  130 , a broadcast receiver  140 , a contents processor  150 , a communicator  160 , and a storage  170 . 
     The voice receiver  110  receives the user&#39;s voice as described above. The controller  120  performs a control operation corresponding to the user&#39;s voice input through the voice receiver  110 . Since the operations of the voice receiver  110  and the controller  120  have been described in detail, the description is not repeated herein. 
     The broadcast receiver  140  tunes in to a broadcast channel and receives contents over the broadcast channel. In response to the user selecting a TV channel, the controller  120  controls the broadcast receiver  140  to tune to the selected TV channel. 
     When the broadcast receiver  140  receives a broadcast signal over the selected TV channel, the contents processor  150  processes the received broadcast signal and outputs the processed broadcast signal through the display  130  and a speaker (not shown). For example, when the ATSC standard is adopted, the broadcast receiver  140  may include an antenna, a radio frequency (RF) down converter, a demodulator, an equalizer, and the like. 
     The contents processor  150  processes diverse contents received through the communicator  160  as well as a broadcast signal received through the broadcast receiver  140 . The contents processor  150  may include diverse signal processing units such as a demultiplexer, a video decoder, an audio decoder, and a scaler. 
     The communicator  160  communicates with diverse external apparatuses. More specifically, the communicator  160  may communicate with diverse external apparatuses using diverse communication methods such as a local area network (LAN), wireless fidelity (WiFi), 3G, 4G, Bluetooth, Zigbee. and near field communication (NFC). 
     More specifically, the communicator  160  may communicate with a voice recognition apparatus (not shown) that converts the user&#39;s voice into text, a server apparatus that searches based on text corresponding to the user&#39;s voice, and a server apparatus (not shown) that determines whether the user&#39;s speech has finished. 
     The storage  170  stores diverse programs and data to operate the display apparatus  100 . In order for the display apparatus  100  to be linked with external server apparatuses as described above, the storage  170  may store an interactive client module. Alternatively, in response to the display apparatus  100  converting the user&#39;s voice into text, searches, and determines by itself whether the user&#39;s speech has finished, the storage  170  may store diverse programs such as a voice recognition module, a search module and a speech finish determination module. 
     The controller  120  may perform the voice control methods according to the diverse exemplary embodiments using the programs stored in the storage  170 . 
     That is, in response to the voice input mode being selected using a button provided on the main body of the display apparatus  100  or using a button on a remote controller or in response to a predetermined trigger motion or a predetermined trigger speech being input, the controller  120  runs the interactive client module and enters the voice input mode. Accordingly, the controller  120  may perform a control operation in accordance with the user&#39;s voice. 
     When the display apparatus  100  enters the voice input mode, the controller  120  composes a graphic object, as described above, and displays the graphic object on the display  130 . More specifically, the controller  120  computes a location to generate a graphic object on the screen of the display  110  using a graphic processing unit (GPU). The GPU computes a coordinate value to display the graphic object and property values such as shape, size, and color using a predetermined value. The GPU renders the graphic objet on the screen of the display  150  based on the computed property values. In response to the display apparatus  100  releasing the voice input mode, the controller  120  may change the shape of the graphic object or may delete the graphic object, as described above. 
     In addition, in response to the user&#39;s voice being input, the controller  120  transmits the user&#39;s voice to the voice recognition apparatus  700  through the communicator  160 , and receives from the voice recognition apparatus  700  text corresponding to the user&#39;s voice. 
     The controller  120  transmits the received text to the server apparatus  800 . Accordingly, the server apparatus  800  transmits to the display apparatus  100  results searched based on the text, and the controller  120  displays the search results on the display  130 . 
     In this state, in response to a speech finish signal being received from the server apparatus  800 , the controller  120  determines that the user&#39;s speech has finished, and releases the voice input mode. 
     In  FIG. 6 , both the voice recognition apparatus  700  and the server apparatus  800  are included in the voice control system  1000 . However, a portion of them may be omitted according to the exemplary embodiment. 
     For example, in one exemplary embodiment in which the voice recognition apparatus  700  may be omitted, the controller  120  may perform voice conversion into text using the text conversion module stored in the storage  170 . In other words, in response to the user&#39;s voice being input, the controller  120  runs the text conversion module and converts the user&#39;s voice into text by itself, instead of transmitting the user&#39;s voice to the voice recognition apparatus  700 . Subsequently, the controller  120  transmits the converted text to the server apparatus  800 , receives search results from the server apparatus  800 , and displays the received search results. 
     Otherwise, in another exemplary embodiment in which the server apparatus  800  may be omitted, the controller  120  may directly perform a search using text converted by the voice recognition apparatus  700 . In other words, the controller  120  runs the search module stored in the storage  170 , and performs a search by inputting the text to the search module. Subsequently, the controller  120  displays the results of the search. In addition, the controller  120  may run the speech finish determination module and determine whether the user finishes speech after every search is performed. In response to determining that the user&#39;s speech has finished, the controller  120  may release the voice input mode. 
     In another example, the voice recognition apparatus  700  may be integrated into the server apparatus  800 . 
     The voice control system may be implemented in diverse forms as described above. The configuration and operation of the display apparatus  100  may vary according to the form of the voice control system. 
       FIG. 8  is a block diagram of a configuration of the server apparatus  800  according to an exemplary embodiment. With reference to  FIG. 8 , the server apparatus  800  may include a server communicator  810 , a server controller  820 , and a database  830 . 
     The server communicator  810  communicates with the display apparatus  100 . The server communicator  810  may receive text corresponding to the user&#39;s voice from the display apparatus  100  operating in the voice input mode. 
     The database  830  may store diverse contents information. More specifically, the database  830  may store diverse information such as electronic program guide (EPG) information, recent movie information, cable broadcast program tables and website information. 
     The server controller  820  searches the database  830  for information including the text transmitted through the server communicator  810 , and transmits the found text information to the display apparatus  100 . In response to subsequent text corresponding to the user&#39;s subsequent speech being received, the server controller  820  may search again based on the subsequent text and additionally transmit the search results to the display apparatus  100 . 
     In response to the display apparatus  100  selecting and identifying contents information, the server controller  820  may determine that additional search is not performed, and may transmit a speech finish signal to the display apparatus  100 . In addition, in response to determining that information related to the lowest level or information regarding contents are provided to the display apparatus  100  by subsequent search, the server controller  820  may transmit a speech finish signal to the display apparatus  100 . 
     As described above, the server apparatus  800  may search in accordance with the user&#39;s speech and analyze whether the user&#39;s speech has finished in line with the display apparatus  100 . As a result, the display apparatus  100  may perform the aforementioned voice control methods without excessive computational burden. 
       FIG. 9  is a flow chart of a voice control supporting method of the server apparatus  800  according to an exemplary embodiment. With reference to  FIG. 9 , the server apparatus  800  receives text from the display apparatus  100  (S 910 ), and searches based on the received text (S 920 ). 
     Subsequently, the server apparatus  800  transmits the search results to the display apparatus  100  (S 930 ). Whenever the server apparatus  800  receives text, the above operations are repeated. 
     In response to the server apparatus  800  determining that the user&#39;s speech has finished (S 940 ), the server apparatus  800  transmits a speech finish signal to the display apparatus  100  (S 950 ). Accordingly, the display apparatus  100  releases the voice input mode. 
     In response to the server apparatus  800  determining that the user&#39;s speech has not finished, the server apparatus  800  awaits transmission of text corresponding to a subsequent speech (S 960 ). In other words, the display apparatus  100  maintains the voice input mode. 
     According to the exemplary embodiments, the display apparatus  100  may release the voice input mode automatically in response to an expectation that the user&#39;s speech has finished in the voice input mode. Therefore, the screen may be prevented from being hidden by an unnecessary UI, malfunction caused by misrecognition of voice may be reduced and unnecessary waste of system resources may be reduced. 
     The diverse voice control methods and voice control supporting methods may be implemented with a program code, and be stored in a non-transitory computer readable storage medium. A server apparatus or a display apparatus in which such a non-transitory computer readable storage medium is embedded may run the program code and perform the aforementioned methods. 
     The non-transitory computer readable medium is a medium which does not store data temporarily such as a register, cash, and memory but stores data semi-permanently and is readable by devices. More specifically, the non-transitory computer readable medium may include compact disks (CDs), digital video disks (DVDs), hard disks, Blu-ray Discs™, universal serial buses (USBs), memory cards, and read-only memory (ROM). 
     The foregoing exemplary embodiments and advantages are merely exemplary and are not to be construed as limiting. The present teachings can be readily applied to other types of apparatuses. Also, the description of the exemplary embodiments are intended to be illustrative, and not to limit the scope of the claims, and many alternatives, modifications, and variations will be apparent to those skilled in the art.