KR20110035647A - Display device and method for buffering thereof - Google Patents

Abstract

PURPOSE: A display device and a buffering method thereof are provided to enable the continuous track play for the data transmitted through an IP network. CONSTITUTION: A communication unit(110) communicates with a service provider through an IP network under the control of a control unit(180). A buffer(120) buffers the data associated with the contents or program received from the service provider through the communication unit, and provides a reproduction unit(130) with the data. The reproduction unit decodes the data provided from the buffer under the control of the control unit and provides a display(140) and an audio output unit(150) with the decoded data.

Description

Display device and method for buffering

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display apparatus, and more particularly, to a display apparatus and a buffering method thereof that enable trick play of playback data without interruption.

With the advent of the home network era, specific protocols have been enacted to realize this. Digital television is expected to be at the center of the device for realizing such a home network. For example, IPTV (Internet Protocol Television) is a representative service that emerged from this background. IPTV is an interactive television service provided through a high-speed internet network. A display device such as a TV is connected through an internet network through a set-top box. The connection with the content providing server.

Information services, video content, and broadcasting of the content providing server are provided to the television receiver via the set-top box. IPTV is a type of Digital Convergence in that it is a convergence of the Internet and television, and it is a general cable broadcasting that only viewers can watch programs they want to watch at a convenient time (Video On Demand, VOD). This is different from.

In other words, IPTV is defined as a multimedia service such as television, video, audio, document, graphics, and data services provided through an IP network that is guaranteed of quality, security, and reliability. ) And stored video services such as VOD, which are transmitted in a unicasting manner.

In general, an IPTV system includes a broadcasting server for transmitting content (program) to an IP network, and an IPTV playback device (eg, an IPTV set-top box (STB)) that receives and plays content from the IP network. The video signal is a bit stream encoded according to a compression scheme such as MPEG2 or MPEG4. A live TV service can access a multicast stream according to the IGMPv2 protocol to watch a broadcast. In the case of a VOD service, a video stream is unicast according to the RTSP protocol. Video content can be viewed.

According to an embodiment of the present invention, it is possible to provide a display apparatus and a data buffering method thereof that enable seamless trick play for data transmitted through an IP network.

Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above are clearly understood by those skilled in the art to which the embodiments proposed from the following description belong. Could be.

According to an embodiment of the present invention, a buffering method of a display apparatus may include receiving data associated with a selected program through an IP network and storing the data in a buffer; Outputting and reproducing data stored in the buffer; And storing the data of the first unit in which the reproduction is completed into blocks of the second unit every predetermined time and storing the data in the buffer.

In addition, the display device according to an embodiment of the present invention includes an input unit for requesting selection of a specific program and reproduction of the selected program; A communication unit configured to receive data related to the selected program through an IP network when a specific program is selected by the input unit; A buffer which receives the data from the communication unit and buffers the data; A playback unit for decoding and outputting the data output from the buffer; And a controller configured to control reproduction of data received through the IP network, and to store the data of the first unit, in which the reproduction is completed, at a predetermined time in a block of the second unit, and store the data in the buffer.

According to an embodiment of the present invention, by dividing and storing the data of the already reproduced section for each block, it is not only possible to provide a trick play service without interruption and wait during data reproduction, but also the user without burden of buffering. The playback position can be moved to the desired section, and the effect can be easily viewed continuously.

The proposed embodiment will be described.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other inventions which are further deteriorated by addition, change, deletion, etc. of other components, or other embodiments included within the scope of the present invention can be easily made. I can suggest.

The term used in the present invention was selected as a general term widely used as possible, but in some cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, the name of a simple term It should be clear that the present invention is to be understood as a meaning of terms.

In other words, in the following description, the word 'comprising' does not exclude the presence of other elements or steps than those listed.

1 is a diagram illustrating a system layer of an IPTV.

First, referring to the system layer of IPTV, as shown in FIG. 1, the IPTV system is composed of a content provider, a service provider, a network provider, and a user layer.

The content provider serves to provide content to a service provider and is also referred to as a content provider.

The service provider serves to provide a service to subscribers, collects various contents, and modifies a signal according to an IP environment and delivers it to a user. Here, the service provider may be a virtual existence.

The network provider connects a user and a service provider through an IP network. The transmission system may use various network networks such as an access network or a backbone network.

The user is provided with content and receives broadcasts, and includes an IPTV, a set top box, a PC or an IP phone.

Hereinafter, the concept of IPTV will be described in more detail.

2 shows a characteristic diagram of a system of IPTV.

Referring to FIG. 2, the system layer of the IPTV may be broadly classified into a content provider, a service provider, and a user.

The content provider is also called a platform provider. These three groups have different roles. A content provider is a large group that provides all the services and data for a broadcast program.

In addition, the service provider transmits multimedia data, maintains the transmission network for stable reception of content to the customer, and the infrastructure and functions for network transmission to the content provider. To provide.

Consumer groups play a role in replaying incoming data using infrastructure such as xDSL and cable, and responding to user needs immediately.

Most are made up of companies that produce IPTV, which can be divided into IPTV, set top box, PC or IP phone. IP Phone does not have a direct relationship with IPTV, but in general, with IPTV, phone service can be provided together.

In detail, each group may be a content provider group, which may include a TV station and a radio station that make a broadcast program.

TV Station refers to existing terrestrial or cable stations, which can create and store programs that users can watch and transmit them digitally. In general, it is to be able to transmit in various broadcast forms.

Radio Station means a general radio station, and although there may be video channels at times, it can be said that most of them operate without a video channel.

VoD, AoD, and MoD services have different characteristics from TV stations and radio stations. In other words, in the case of VoD or AoD, it saves the broadcasting program, movie and music that I want and then plays it for viewing. For example, if there is a broadcast program that was not properly viewed because there is no time to watch the current broadcast program, it is possible to access a site that provides such a broadcast service and download the file or play it immediately.

AoD also offers the ability to record audio programs in real time or make it difficult to record audio programs.

MoD stands for Music On Demand and you can download and listen to the music you want. This seems to be similar to AoD, but the service is likely to be a record company or a record distributor may have expanded existing Web services.

The PF server is serviced by a company that manages all broadcasting and location information provided by the content provider. This service mainly contains broadcasting time or location information necessary for broadcasting and information that a user can access.

The EPG service is one of convenient services that allows a user to search a broadcast program by time zone and to grasp by channel. EPG service is a service that is used frequently enough that the type provided by TV Guide is representative, and the program is automatically installed and executed on the customer side.

ECG service has all functions that user can conveniently use contents information of content provider and location and access authority of access server. In short, it is an electronic content guide (EPG) that provides easy access to servers with content and detailed information about the content.

Portal Server is a web service provided by each broadcasting station. The portal server is connected to a web server of a broadcasting company or a service provider. The role of Portal Server is to search or view the list of programs provided by each broadcaster or content providers that provide content services.

The service provider provides network stability and bandwidth so that multimedia data and broadcast data transmitted from a content provider are normally transmitted.

Service providers may also provide IPTV services using existing cable networks. In this case, equipments of a delivery network need to be changed.

In other words, network equipment that can transmit data in real time should be configured, and network should be configured in consideration of bandwidth to customer. These devices need to reduce the bandwidth by processing a large amount of multimedia data using the multicast service, which is the basic network service of IPTV.

If bandwidth is not secured, Service Provider may retranscode multimedia broadcasting data from optical fiber network configuration or content provider and transform it into MPEG-4 or MPEG-7 in order to secure bandwidth. have.

The Service Provider has to provide several services for this purpose. It is designed to provide size Network Management System (NMS), Dynamic Host Control Protocol (DHCP) and CDN services.

The NMS service allows the service provider to manage the delivery network and IPTV receivers of the customer, which can be transmitted to each customer. In other words, by using this service, it is possible to determine how much traffic is generated for a certain broadcast and in which region the bandwidth is insufficient.

DHCP service is used to automatically assign IP to customer's IPTV receiver and to inform the address of CDN server. DHCP services are also a good way to assign IP to PCs in the general network. Send an address to connect to the licensed IPTV receiver so that the user can register for the first time.

CDN service is data provided by the service provider. When the IPTV receiver is powered on for the first time, the CDN service receives the CDN information from the service provider. This information contains the registration or authentication of the user of the IPTV provider and the aforementioned PF information.

A customer can have several types of IPTV receivers. If you have a regular TV, you can enjoy IPTV by renting an IPTV STB at a low price. A service provider can pay additional service costs at a low price and apply for an IP phone.

IPTV receiver is basically equipped with a network interface (Network Interface) for connecting to the network and the Internet protocol to receive and process data packets coming from the network to play on the screen in the case of multimedia data, and to operate with a remote control, Data packets must be sent quickly over the network to get the information from the server and react.

That is, the IPTV receiver should operate to transmit the user's requirements in both directions while processing the multimedia data. Also, to use the service well, the remote control should be provided with buttons for IPTV.

3 is a diagram illustrating a configuration of a display device according to a first embodiment of the present invention, and FIG. 4 is a diagram illustrating a configuration of a display device according to a second embodiment of the present invention.

In the display device according to the first embodiment of the present invention, referring to FIG. 3, the communication unit 110, the buffer 120, the playback unit 130, the display 140, the audio output unit 150, and the input unit 160 are described. , The memory 170 and the controller 180 are configured.

The communication unit 110 performs communication with a service provider through an IP network under the control of the controller 180. That is, the communication unit 110 requests the service provider to provide the content or program requested by the user, and receives data related to the requested content or program from the service provider.

The buffer 120 buffers data related to content or a program received from the service provider through the communication unit 110 and provides the buffer 130 to the playback unit 130.

The playback unit 130 decodes the data provided from the buffer 120 under control of the controller 180 and provides the decoded data to the display 140 and the audio output unit 150.

The display 140 displays video data decoded and provided by the playback unit 130, and the audio output unit 150 outputs audio data decoded and provided by the playback unit 130. The display 140 and the audio output unit 150 may be implemented as hardware separate from the display device.

In addition, the display 140 may be applied to various types of display modules such as digital light processing (DLP), liquid crystal display (LCD), plasma display panel (PDP), and the like.

The input unit 160 receives a user's playback request and provides it to the controller 180 and may be implemented as a key button, a touch screen, a remote controller, or the like. According to an embodiment of the present invention, the input unit 160 receives a selection signal according to a request to play a specific program, a trick play request (Forward, backward), etc. of the specific program, from the user and transmits the selected signal to the controller 180.

The memory 170 includes a program memory and a data memory. The program memory stores a program for controlling a general operation of the display device, a software program for communicating with the service provider, and the like.

The controller 180 controls overall components of the display apparatus.

More specifically, the controller 180 controls the buffering operation and the reproduction operation by receiving the specific program requested for reproduction from the server provider when the reproduction request of the specific program is received from the input unit 160.

Hereinafter, the operation of the controller 180 will be described in more detail with reference to the accompanying drawings.

First, the controller 180 allows a specific program requested to be reproduced as described above to be provided from the server provider and buffered in the buffer 120.

In addition, the controller 180 outputs the data buffered through the buffer 120 through the display 140 and the audio output unit 150 via the playback unit 130, and displays the display every predetermined time. The data output through the 140 and the audio output unit 150 (data that has been reproduced) are configured in a block of a specific unit and stored in the buffer 120.

Before describing the operation of the controller 180, a conventional data buffering operation will be described.

5 is a diagram for explaining a conventional data buffering and reproducing operation.

Referring to FIG. 5, since a buffer size is generally limited, data that can be stored in the buffer is limited. Therefore, in a trick play including forward and backward of the data stored in the buffer, if a region other than the buffer size is to be reproduced, a buffering time is required as a re-buffering operation for the region is to be performed.

That is, when a trick play is requested from the user to the first movement desired time (case 1) while the reproduction operation is being performed based on the buffered data at the entire running time of the reproduction data, it corresponds to the first movement desired time. Since the data is currently stored in the buffer, the playback operation can be continuously performed by immediately moving to the first desired movement point without interruption or waiting due to a separate buffering operation.

However, when a trick play is requested from the user to the second desired movement point (case 2), since the data corresponding to the second desired movement point is already discarded (deleted) in the buffer, the second desired movement is desired. The data corresponding to the point of time must be provided from the service provider again and then buffered. In addition, a disconnection or wait occurs according to a buffering process of data corresponding to the second movement desired time point.

Accordingly, in the embodiment according to the present invention, the playback operation for Case 2 is improved, and even if a user requests a playback for an area other than the buffer size, the playback operation may be continuously performed without any interruption or wait. To help.

6 and 7 are diagrams for explaining an example of a block configuration according to the first embodiment of the present invention.

Referring to FIG. 6, the controller 180 configures the data of the first unit, which has been reproduced every predetermined time, into a block of the second unit and stores the data in the buffer 120. Here, the first unit is preferably larger than the second unit. For example, the controller 180 configures the playback data of about 1 minute into blocks of about 10 seconds and stores them in the buffer 120.

To this end, the controller 180 determines a first unit and a second unit for the block configuration. Herein, the first unit and the second unit may be determined by the user, or may be automatically determined by the controller 180.

The first unit may be determined by the total running time of the program being reproduced. That is, if the total running time is long, the number of generation of the block increases accordingly, so that the block of the second unit may not be generated by setting the first unit to be larger and limiting the size of the buffer 120. Be prepared for the situation.

In addition, the second unit is a time during which normal reproduction is possible. In general, if data of about 5 seconds is stored, the data can be normally reproduced while performing a buffering process on subsequent data of the stored data. In conclusion, since the second unit is a time for performing data reproduction without interruption, the second unit is dependent on the network environment of the user. That is, it is preferable to determine the second unit according to the network environment of the user, and configure a block accordingly.

To this end, the controller 180 configures the block by storing and maintaining the data stored in the buffer 120, and enables trick play according to a user's request later by using the configured block.

Referring to FIG. 7, the controller 180 continuously stores a portion of the reproduced data in the buffer to construct a block of the second unit B from the reproduced data of the first unit A. FIG. The other portions are deleted from the buffer.

For example, when the first unit is set to 30 seconds and the second unit is set to 5 seconds, the control unit 180 stores the data for 5 seconds after the playback is started in the buffer 120 even after the playback is completed. Do not delete it. Then, the data after 5 seconds, that is, the data from 6 to 30 seconds are deleted from the buffer 120 immediately after the reproduction is completed.

In other words, if the currently played part is included in the range for the block configuration, the controller 180 keeps the corresponding part continuously stored in the buffer, and on the contrary, the controller 180 is in the range outside the block. If included, the portion is to be deleted from the buffer immediately after playback. Accordingly, when data corresponding to a running time of a total of 1 hour is reproduced, a total of 120 blocks in units of 5 seconds are stored in the buffer.

In addition, the second embodiment according to the present invention differs only in the configuration of the buffer 120 from the first embodiment.

That is, in the first embodiment, the buffering operation of the data is performed using one buffer 120.

However, in the second embodiment of the present invention, the buffering operation of the data is performed by using two buffers 122 and 124.

That is, referring to FIG. 8, the first buffer 122 receives and stores data related to a program selected by a user from the service provider. In addition, the second buffer 124 stores a block configured by the controller 180 based on the data stored in the first buffer.

In other words, the controller 180 performs a reproducing operation using data stored in the first buffer 122, and the first embodiment of the reproducing data among the data stored in the first buffer 122 is performed. Similarly, the reproduction completed data of the first unit is composed of blocks of the second unit and stored in the second buffer 124.

As a result, since the first buffer 122 performs only data buffering as long as the actual playback operation is not interrupted, the buffer size can be minimized.

Meanwhile, the controller 180 enables trick play of the data being reproduced by using the block configured as described above.

That is, when the trick play is requested from the user, the controller 180 causes the trick play screen as shown in FIG. 9 to be displayed.

In this case, the displayed trick play screen is provided with block information of a second unit configured by the controller 180. Accordingly, the user navigates the provided blocks and selects one specific block, You can execute backward of the data being played.

In this case, when any one specific block is selected, the controller 180 allows the data from the time after the end of the selected block to be buffered in the buffer based on the selected block.

That is, in the embodiment of the present invention as described above, since the already reproduced data is managed through the block configuration, when the reproduction operation is started based on the generated block, the continuous data reproduction operation is performed from the starting point of the selected block. Can't.

In other words, when the first unit and the second unit are determined as described above, and the block is configured, since the data of 30 seconds is stored as data of 5 seconds, the data of the remaining 25 seconds is stored in the buffer 120. Has already been deleted from.

Therefore, when a specific block is selected, the controller 180 receives the data corresponding to a later time point of the selected block from the service provider and buffers the buffer 120.

Accordingly, in the embodiment according to the present invention, even if a backward is requested at a time point out of the buffer size from the user, playback can be performed immediately without interruption or wait for a separate buffering process.

10 is a flowchart for explaining a buffering method of a display apparatus according to a first embodiment of the present invention step by step.

Referring to FIG. 10, in the buffering method of the display apparatus, data related to a program selected by a user is buffered in the buffer 120 (operation 100). That is, the controller 180 receives a selection signal of a specific program from the input unit 160, and when a selection signal of the specific program is input, transmits a request signal of data related to the selected specific program to a service provider. As described above, when the service provider transmits a request signal for specific data, the service provider transmits the requested data through an IP network, and the display device receives the data transmitted through the IP network. Transfer to buffer 120.

As described above, the data buffered in the buffer 120 is signaled through the playback unit 130 and then output through the display 140 and the audio output unit 150.

The controller 180 starts the processing operation of the data output through the display 140 and the audio output unit 150, that is, the data already reproduced as described above (step 110). In order to start the processing operation of the data after the reproduction is completed, the first unit and the second unit for the block configuration must be determined. The first unit refers to a reproduction time of data for which the total reproduction is completed, and the second unit refers to a reproduction time of data composed of blocks among the first units. As a result, only the second unit of data among the first unit of data is composed of blocks, and other data is deleted.

The controller 180 checks whether the currently reproduced data is included in the second unit for constructing the block (step 120). That is, the controller 180 determines whether the second unit for the block configuration has elapsed from the start point of the data according to one first stage.

In addition, if the currently reproduced data is included in the second unit for the block configuration as described above, the controller 180 continuously stores the reproduced data in the buffer 120 without deleting the reproduced data. (Step 130).

In addition, the controller 180 deletes the portion of the portion from the buffer 120 as soon as the reproduction is completed, if the data that is currently reproduced is out of the second unit for the block configuration as described above (step 140). ).

For example, when the first unit is 30 seconds and the second unit is 5 seconds, when the reproduction of the data corresponding to the current 3 second portion is completed, the controller 180 regenerates the reproduction from the buffer 120. This saves the stored portion without deleting the completed portion. However, when the reproduction of the data corresponding to the current 9 second portion is completed, the controller 180 deletes the portion from which the reproduction is completed from the buffer 120. That is, the controller maintains storage only for data of 0 seconds to 5 seconds, and deletes data of 5 seconds to 30 seconds immediately after reproduction. Similarly, data from 30 to 35 seconds are stored and data from 35 to 60 seconds are immediately deleted.

If a playback stop request is input from the input unit 160, the controller 180 stops the playback operation, or returns to step 100 to continuously control the playback and block construction of the data ( Step 150).

11 is a flowchart for explaining a buffering method of a display apparatus according to a second exemplary embodiment of the present invention step by step.

Referring to FIG. 11, in the buffering method of the display apparatus, the buffering method of the display apparatus buffers data related to a program selected by a user in the first buffer 122 (operation 200). That is, the controller 180 receives a selection signal of a specific program from the input unit 160, and when a selection signal of the specific program is input, transmits a request signal of data related to the selected specific program to a service provider. As described above, when the service provider transmits a request signal for specific data, the service provider transmits the requested data through an IP network, and the display device receives the data transmitted through the IP network. It transfers to the first buffer 122.

As described above, the data buffered in the first buffer 122 is signal-processed through the playback unit 130 and then output through the display 140 and the audio output unit 150.

The controller 180 calculates a start point of the block to be constructed, in step 210, for the block configuration. That is, when the first unit is set to 30 seconds and the second unit is set to 5 seconds as described above, the starting point of the block is 0 seconds, 30 seconds, 60 seconds, 90 seconds, and so on.

The controller 180 checks whether the reproduction time point of the current data corresponds to the calculated start point (step 220).

If the reproduction point of the current data corresponds to the calculated start point, the controller 180 stores data from the start point to a point corresponding to the second unit in the second buffer 124 (step 230). .

The controller 180 checks whether a reproduction stop request is input from the input unit 160 (step 240), terminates when the reproduction stop request is input, or calculates a start point of a block to be constructed next ( 250 steps).

Subsequently, the controller 180 waits for a predetermined time until the start point of the next block arrives, and then returns to the step 220 (step 260).

12 is a flowchart for explaining a trick play method of a display apparatus according to an exemplary embodiment of the present invention step by step.

Referring to FIG. 12, in the trick play method of the display apparatus, the controller 180 receives a trick play request signal of data being reproduced from the input unit 160 (step 300).

When the trick play request signal is input from the input unit 160, the controller 180 displays a trick play screen including the configuration block information as illustrated in FIG. 9 (S310).

Next, the user selects a specific block to be reproduced through the input unit 160, and the controller 180 receives a selection signal of the specific block from the input unit 160 (step 320).

When the selection signal of the specific block is input, the controller 180 controls the reproduction operation to be performed from the start point of the selected block by using the data stored in the buffer 120 (step 330). Here, in the second embodiment of the present invention, since the constituted block is stored in the second buffer, the selected block is moved and stored in the first buffer, so that the playback operation is started from the start point of the moved and stored block. To be done.

In addition, when playback starts from the start point of the specific block, the controller 180 allows the data corresponding to the time point after the end of the block to be provided from the service provider to be stored in the buffer (step 340).

As described above, according to an embodiment of the present invention, by dividing and storing the data of the already reproduced section for each block, it is possible not only to provide a trick play service without interruption and wait during data reproduction, but also for the user to buffer, etc. It is possible to conveniently watch continuously by moving the playback position to the desired section without burden.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 shows a system layer of an IPTV.

2 is a diagram showing the characteristics of a system of IPTV.

3 is a diagram illustrating a configuration of a display apparatus according to a first embodiment of the present invention.

4 is a diagram illustrating a configuration of a display apparatus according to a second embodiment of the present invention.

5 is a diagram for explaining a conventional data buffering and reproducing operation.

6 and 7 are diagrams for explaining an example of a block configuration according to a first embodiment of the present invention.

8 is a view for explaining an example of the block configuration according to the second embodiment of the present invention.

9 is a diagram illustrating an example of a trick play search screen according to an embodiment of the present invention.

10 is a flowchart for explaining a buffering method of a display apparatus according to a first embodiment of the present invention step by step.

11 is a flowchart for explaining a buffering method of a display apparatus according to a second embodiment of the present invention step by step;

12 is a flowchart for explaining a trick play method of a display apparatus according to an exemplary embodiment of the present invention step by step.

Claims (18)

Receiving data related to the selected program through an IP network and storing the data in a buffer; Outputting and reproducing data stored in the buffer; And, And buffering the first unit of data, which has been reproduced, at a predetermined time into blocks of a second unit, and storing the data in the buffer. The method of claim 1, And the first unit is larger than the second unit. The method of claim 1, And determining at least one unit of the first unit and the second unit. 3. The method of claim 2, The block of the second unit is buffering method of the display device, characterized in that configured through the maintenance and deletion of the data stored in the buffer. The method of claim 4, wherein Storing and storing of the data stored in the buffer is performed from the start point of the data corresponding to the first unit to the point corresponding to the second unit, And deleting data stored in the buffer is performed from a point corresponding to the second unit to an end point of the data corresponding to the first unit. 3. The method of claim 2, The data received through the IP network is stored in a first buffer, The configured second unit block is stored in a second buffer. The method of claim 1, If a trick play request command is input, the method further comprises providing a search screen for searching in the unit of the configured block. The method of claim 7, wherein And if a particular block is selected on the search screen, starting playback from a start point of the selected block. The method of claim 8, And if the reproduction starts from the start point of the specific block, buffering data corresponding to a time point after the end of the block being reproduced. The method according to any one of claims 1 to 9, The second unit is a buffering method of a display apparatus, characterized in that the data unit capable of normal reproduction. An input unit for requesting selection of a specific program and reproduction of the selected program; A communication unit configured to receive data related to the selected program through an IP network when a specific program is selected by the input unit; A buffer which receives the data from the communication unit and buffers the data; A playback unit for decoding and outputting the data output from the buffer; And, And a control unit configured to control reproduction of data received through the IP network, and to store the data of the first unit, which has been reproduced every predetermined time, into a block of a second unit and to store the data in the buffer. The method of claim 11, And the second unit is smaller than the first unit. The method of claim 12, The control unit maintains the storage of data corresponding to the second unit from the data of the first unit stored in the buffer, and deletes other data exceeding the second unit to configure the block. Display device. The method of claim 13, And other data exceeding the second unit are immediately deleted from the buffer at the time of completion of reproduction. The method of claim 12, The buffer includes a first buffer for storing data received through the IP; And a second buffer for storing the second unit block configured through the controller. The method of claim 11, And the control unit controls to display a search screen searchable in units of the configured blocks when a trick play request command is input from the input unit. The method of claim 16, And when the specific block is selected on the search screen, the controller controls playback to be performed from the start point of the selected specific block through the playback unit. The method of claim 17, And when the reproduction of the specific block starts, the controller controls the data from a time point after the end of the playing block to be buffered in the buffer.

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