KR20050052928A - Display playback device reproducing audio-visual data and interactive contents and display playback method thereof - Google Patents

Abstract

Disclosed are a reproducing apparatus for reproducing moving image data and interactive content, and a reproducing method thereof.

A reproduction apparatus for reproducing moving picture data and interactive contents according to the present invention, includes: a presentation engine for decoding and reproducing the moving picture data; An application engine for interpreting and playing back the interactive content; And an application manager for controlling playback of the video data and playback of the interactive content.

Accordingly, it is possible to provide additional functions such as a program function that provides an interactive function with the user in addition to the reproduction of the moving picture information, and a browsing function that retrieves and reproduces relevant information from the markup document.

Description

Display playback device reproducing audio-visual data and interactive contents and display playback method

The present invention relates to the reproduction of a storage medium, and more particularly, to a reproduction apparatus for reproducing moving picture data and interactive content and a reproduction method thereof.

The moving picture data recorded in the current storage medium includes compressed coded moving picture information and navigation information for controlling reproduction of the moving picture information. More specifically, the moving picture information is composed of a moving picture stream (Audio-Visual Stream) including video, audio, and / or sub-objects encoded according to the Motion Picture Experts Group (MPEG) standard. It may further include additional information such as encoding attributes of the video stream or an entry point for random access, a play list made of an object by determining the playback order of the video.

On the other hand, the navigation information is composed of navigation commands for controlling the reproduction of the moving picture information such as a command for reproducing the aforementioned play list or a command for branching to another play list. In general, navigation information is stored in the form of a table of binary codes. Accordingly, the video information can be played by referring to the navigation information of the storage medium, and the user can watch a video such as watching a high quality movie. This collection of navigation commands is called a movie object.

However, a conventional storage medium for recording a moving picture includes a browsing function capable of importing and displaying information related to a moving picture from a Java application program or markup document that provides an interactive function with a user, such as a game or a chat using a reproduced moving picture. There has been a problem in that interactive content such as an application providing a video cannot be provided together with video data.

On the other hand, an interactive DVD (Digital Versatile Disc) is a storage medium that can reproduce markup documents together with video data in a personal computer or home appliance type playback apparatus. The interactive DVD contains moving image data according to the conventional DVD-Video standard, and further includes a markup document for supporting the interactive function.

When the interactive DVD is played back, the moving picture screen on which the moving picture data is reproduced and displayed is embedded in the markup screen being reproduced from the markup document. For example, when a movie title is recorded on an interactive DVD, a movie is displayed on a moving picture screen, and various additional information such as a script of the movie, a plot, a picture of an actor, and the like are displayed on the rest of the markup screen. The additional information may be displayed in synchronization with the video title. For example, when a specific actor begins to appear, history information about the actor is displayed and used.

However, interactive DVD is a document format using a markup language, and since programming is not provided, there is a problem in that it is not suitable for writing a Java program application such as a game or a chat.

Accordingly, an object of the present invention is to provide a reproduction apparatus and a reproduction method for reproducing moving image data and interactive contents in order to solve the above-mentioned problems.

An object of the present invention is to provide a playback apparatus for playing back moving picture data and interactive contents, comprising: a presentation engine for decoding and playing back moving picture data; An application engine for interpreting and playing back interactive content; And an application manager for controlling playback of video data and playback of interactive content.

The interactive content includes a programmable Java application and a markup language application using a markup document, and the application engine preferably includes a program engine for executing the Java application and a browser engine for executing the markup language application.

The playback device preferably reads and reproduces interactive content from at least one of a removable storage medium, a local storage storage medium, and a storage medium on a network.

The application manager preferably finds the first application to be executed when the removable storage medium is inserted into the playback device.

It is a good idea to initialize the application runtime before running the application.

Initializing the application execution environment includes initializing the directory to refer to a directory managing movie data, a directory managing nonvolatile memory, a directory managing volatile memory, and a directory managing removable storage media in a file system on memory. desirable.

The application manager preferably performs application initialization after the application execution environment initialization is performed and before the application engine is executed.

Application initialization preferably creates an execution directory of the application on the memory and manages the execution directory in the file system of the memory separately from the storage directory of the application on the storage medium.

When the application manager no longer exists, or when the application manager switches to another application execution mode, the application manager preferably terminates the application execution environment.

Application execution environment termination preferably deletes the contents of the directory managing the application execution directory and the volatile memory.

When the application manager runs the application in the application engine, it is preferable to control the application manager to operate according to a predetermined execution life cycle defined in the application engine. In the Java application execution mode, the application has one of the loaded, stopped, running, and destroyed states. In the markup language application mode, the application is loaded, running, and terminated. It is preferable to have an execution state of either.

According to another aspect of the present invention, the above object is a playback method for playing video data and interactive content, comprising: (a) initializing an application execution environment; (b) initializing the application; (c) terminating the running application when the life cycle of the application ends; And (d) terminating the application execution environment if there are no more applications to be executed or switching the execution mode.

Step (a) is a step of initializing a directory to refer to a directory managing video data, a directory managing nonvolatile memory, a directory managing volatile memory, and a directory managing removable storage medium in a file system on a memory.

step (b) is to create an execution directory of the application on the memory and to manage the execution directory in the file system of the memory separately from the storage directory of the application on the storage medium,

Step (c) is to delete the contents of the execution directory of the application.

Step (d) is preferably a step of deleting the contents of the directory managing the volatile memory.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a view showing an example of a playback device for playing back video data and interactive content according to a preferred embodiment of the present invention.

Referring to FIG. 1, a playback device 130 according to a preferred embodiment of the present invention stores video data 102 and application files 104, 112, and / or 122 from storage media 100, 110, and / or 120. Read and play, and output video data and interactive content through the display device 140.

The storage medium includes not only a removable storage medium 100 such as an optical disk, a local storage 110 such as a hard disk, but also a download of an application file through a network or the Internet 120. The removable storage medium 100 records video data 102 in which video and audio data are compressed and encoded, and an application file 104 for providing an interactive function of a game, a chat, and an additional information indicator. Such interactive content (application file) may be stored in a local storage 110 or a network or internet 120 server, as well as a removable storage medium.

The playback apparatus 130 according to an exemplary embodiment of the present invention reads video data from a storage medium, decodes the video data through an AV decoder, and outputs the video data in the form of video and sound.

On the other hand, the interactive content 104, 112 and / or 122 has a form that operates according to a program, such as a Java application, and a data structure defined in the Hyper Text Markup Language (HTML) markup document. In the following, the former is abbreviated as program data and the latter is abbreviated as browser data. Interactive content in the form of program data and / or browser data may be collectively referred to as an application file.

Interactive content including these program data and / or browser data is executed by each application engine described later. The application manager described later controls each application engine. The user can control the application through an input device such as a remote controller or a mouse.

For example, video data consisting of video and audio such as a movie is recorded on a storage medium, and an interactive content (application file) is an application that authors a script for a movie, information on a shooting location, interview information of an actor and a director, and the like. If this is recorded, each can be reproduced and output on one screen. The user may control the application by operating a remote controller or the like. Accordingly, various applications that provide an interactive function with the user together with the video data may be played.

Furthermore, interactive content may be selectively read from a removable storage medium, the application file may be downloaded by connecting to a web service of a film company using a network interface provided in a playback device, or a new application file produced by a film company may be downloaded. After receiving it, you can save it to local storage such as a hard disk and play it again later.

Hereinafter, a hardware configuration of a playback apparatus that plays back video data and interactive content according to a preferred embodiment of the present invention will be described.

2 is a diagram illustrating an example of a hardware configuration of a playback apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 2, a playback apparatus 200 according to a preferred embodiment of the present invention includes a host processor 210, an AV decoder 212, a graphics controller 214, a video renderer 220, and an audio renderer 222. , Interfaces 232, 234, and / or 236 to user interface 224, memory 230, and other storage media.

The host processor 210 controls the overall operation of the reproduction device 200. Each application engine that reproduces video data and interactive content, which will be described later, is executed on the host processor 210.

The AV decoder 212 reads from the storage medium, decodes moving image data stored in the memory 230 or an external memory (not shown), and outputs the image data to the video renderer 220.

The graphics controller 214 converts the graphic data, which is the result of the reproduction engine playing on the above-described host processor to reproduce and output the interactive content, into data suitable for compositing with the image data output from the AV decoder 212, and the video. Output to the renderer 220.

The video renderer 220 synthesizes the image data output from the AV decoder 212 and the graphic data output from the graphic controller 214 and outputs them to the video output device. This includes a scaler function to reduce the size of the video image and a blending function to synthesize graphic data with the image data.

The audio renderer 222 synthesizes a multi-channel audio data stream decoded by the AV decoder 212 and outputs the synthesized audio channel to the audio output device.

The user interface 224 processes and inputs input signals of a user input device such as a remote controller, a mouse, a keyboard, and a joystick to the host processor 210.

Interfaces 232, 234 and / or 236 to other storage media include removable drive interfaces 232, local storage interfaces 234, network interfaces 236, and the like.

The removable drive interface 232 reads data such as moving picture data and / or interactive content from a removable storage medium and stores the data in the memory 230.

The local storage interface 234 reads data such as moving image data and / or interactive content from a storage medium that is fixed to a playback device such as a hard disk drive and is not removable, and stores the data in the memory 230.

The network interface 236 connects an external network such as the Internet, downloads interactive content from a remote server, and stores the interactive content in the memory 230 or the local storage 234.

Hereinafter, a software configuration of a playback apparatus that plays back video data and interactive content according to a preferred embodiment of the present invention will be described.

3 is a diagram showing an example of the configuration of the software of the playback apparatus according to the preferred embodiment of the present invention.

Referring to FIG. 3, the configuration of software executed in the host processor 210 is illustrated on the hardware base 300 of the above-described playback apparatus. The software of the playback device according to the present invention includes a presentation engine 310, an application engine 312, 314 and / or 316 and an application manager 318.

The presentation engine 310 controls the above-described AV decoder 212 to decode and reproduce compressed and encoded video data.

The application engines 312, 314 and / or 316 include a navigation engine 312, a program engine 314 and / or a browser engine 316.

The navigation engine 312 executes a Movie application consisting of a collection of commands that control the playback of video data, such as navigation commands.

The program engine 314 executes a Java application (also called program data) consisting of a collection of instructions, such as Java's byte code. That is, a specific program that implements functions such as game, chat, director's commentary, and the like is executed to provide an interactive function with a user using a video.

The browser engine 316 executes a markup language application (also referred to as browser data) composed of markup documents such as HTML. That is, by executing a browsing command composed of a markup language or an execution script language included in the browser data, information related to moving image data may be retrieved from the markup document and reproduced together with the moving image data.

At this time, the above-described navigation engine 312, program engine 314 and browser engine 316 are interactive using a video using the API function (see solid arrow in FIG. 3) for the presentation engine 310 described above. Can provide functionality.

The application manager 318 controls the respective application engines 312, 314 and / or 316 described above to manage the reproduction of moving image data and the execution of the application. The application manager 318 is described in detail with reference to FIG. 4.

The aforementioned software resources are executed in particular on the host processor 210 based on the hardware resource 300 as shown in FIG. 3.

In addition, the software of the playback device includes a real-time operating system such as a graphical user interface (GUI) function required by the application engine or a native library providing graphic image handling, a memory allocation request required by the application engine, and a task generation request. It may include a system software that provides a function supported by the native content decoder, a native content decoder for decoding data such as JPEG, PNG and font data.

4 is a diagram for describing a process of the application manager 318 illustrated in FIG. 3 controlling playback of interactive content.

Referring to FIG. 4, the application manager 318 analyzes an application file read from a storage medium such as a removable storage medium, a local storage, or a network, and prepares the application file to be executed by the application engines 312, 314, and / or 316. . In this process, the application file is generated as an application context of an executable form. Context is synonymous with the execution process used by Microsoft's Windows or Linux. In a simple example, when running the calculator program twice in Windows, there is only one program file stored on the storage medium, but two execution processes (contexts) are created on the memory.

In addition, the application manager 318 finds an application file to be executed first when a storage medium such as an optical disc is inserted into the playback apparatus. Furthermore, the application engines 312, 314 and / or 316 are initialized to determine which execution mode each application file operates in and to operate in the corresponding execution mode. Here, the execution mode refers to one of a movie mode, a program mode (or Java execution mode), and / or a browser mode (or markup execution mode). One or a plurality of applications may be executed according to the operation definition of each application engine.

Hereinafter, a process of initializing / terminating the application engine by the application manager 318 will be described.

5 is a view for explaining a process in which the application manager 318 according to the present invention initializes / terminates the execution environment of the application and the application.

Referring to FIG. 5, the application manager 318 performs an initialization task required for execution as shown before the application is executed in the application engine.

Application Execution Environment Initialization 500 refers to the execution of an application when a mode is switched to an execution mode different from the current execution mode or a storage medium is inserted into a playback device before the application is executed. This is the process of initializing the execution environment before. Application initialization (510 or 520) refers to all operations that occur during the process of loading application files recorded on the storage medium into a file system on a memory having a directory structure and loading resources required by the application. Say. Usually, an execution directory is created for executing an application, and the like, which will be described later.

When the execution environment of the application is initialized 500, the application is initialized 510 according to the life cycle 512 of the application to be executed. As the life cycle ends, the application is terminated (Application Finalization) 514. This process is repeated while there is an application to be executed, and if there are no more applications to be executed, the application execution environment is terminated (Application Execution Environment Finalization) 502.

FIG. 6 is a diagram for describing an example in which the application life cycles 512 and 522 illustrated in FIG. 5 are applied to a movie mode.

Referring to FIG. 6, in a movie mode for playing video data, a life cycle of an application may include an active state and a paused state. The active state refers to a state in which video and audio are normally played or fast played, and video and audio are stopped and buttons are moved in a still state. The paused state is a state of operation by a pause button of the user and the user may also control to return to an active state by a pause cancellation operation. If you switch to a different execution mode (eg program mode or browser mode) after an active state, you control the playback device with a new application engine (eg program engine or browser engine) in the switched mode. You can also pass

FIG. 7 is a diagram for describing an example in which the application life cycles 512 and 522 illustrated in FIG. 5 are applied to a program mode.

Referring to FIG. 7, a Java application in program mode has four life cycles: loaded, paused, active, and destroyed. The application manager 318 creates a directory for executing the Java application to execute the Java application, and loads the Java application file in the file system on the memory in advance. Java applications initialized through this process run according to the life cycle of four states.

In the loaded state, for example, a program engine, such as a Java Virtual Machine (JVM) execution engine, uses a Java virtual machine (JVM) as a class file that is an executable file of a Java application. ) Is the state loaded by the interpreted code in the execution memory. The interpretation process involves the linking of multiple class files with class packages in the execution engine. It also creates a context for the Java application to run.

A pause state is a state in which a program engine, such as a Java virtual machine (JVM) execution engine, completes a call to an initXlet () method in interpreted executable code of a Java application.

An active state is a state in which a program engine, such as a Java virtual machine (JVM) execution engine, completes a call to the startXlet () method in interpreted executable code of a Java application. In this state, a Java application can receive events on the Java Virtual Machine (JVM) and continue executing the call operations.

A destroyed state is a state in which a program engine, such as the Java virtual machine (JVM) execution engine, executes a DestroyXlet () method in interpreted executable code of a Java application. The context of the Java application no longer exists. When the context disappears, the application manager 318 performs application finalization used by the context. This means that all files in the APPS directory, which is the execution directory of the application described later, are removed. If you switch to a different execution mode (for example, movie mode or browser mode) after the destroyed state, you control the playback device with a new application engine (for example, a navigation engine or a browser engine) in the switched mode. You can also pass

FIG. 8 is a diagram for describing an example in which the application life cycles 512 and 522 illustrated in FIG. 5 are applied to a browser mode.

Referring to FIG. 8, a markup language application in a browser mode has three life cycles: loaded, active, and terminated. The application manager 318 creates a directory for executing the markup language application to execute the markup language application, and loads the markup language application file into the file system on the memory in advance. The markup language application initialized through this process is executed according to three life cycles.

A loaded state is a state in which a markup document is analyzed through a browser engine such as a markup language application engine, and the interpreted document is loaded into execution memory in the execution engine as a data structure that can be processed inside the playback device. Say. If this loading process succeeds, the markup document becomes active and can interact with the user.

The terminated state means that the markup document is no longer used in the execution engine's execution memory and has been removed. After the terminated state, all files in the application run directory are removed. The application engine can start a new application by loading the new document back into memory and transitioning to the loaded state. Or when switching to another execution mode (for example, a movie mode or a program mode) after the destroyed state, a new application engine (for example, a navigation engine or a program engine) in the switched mode is used to You can also pass control.

When the mode is switched to another execution mode, the application execution environment finalization (Application Execution Environment Finalization) 502 is performed, and the application manager 318 is TEMPORAL which is a directory managing the APPS directory and the volatile memory, which will be described later. Delete the data in the directory and switch to the new run mode.

FIG. 9 is a diagram for describing a file directory structure generated during the initialization 500 of the application execution environment shown in FIG. 5.

Referring to FIG. 9, the application manager 318 creates a BDMV directory for managing video data and a directory of TEMPORAL, PERSISTENT, AUXILIARY, and ROMDAT in a file system on a memory in an initialization process of an application execution environment.

The TEMPORAL directory is a directory that connects directories of volatile storage media accessible to applications. The TEMPORAL directory can be used for fast, temporary file sharing between applications. The PERSISTENT directory is a directory in which a directory of a nonvolatile storage medium such as a hard disk is connected. The PERSISTENT directory can store data received from an external medium such as the Internet. A file storing video data, playback control information, a Java application, a markup language application, and the like may be stored. Also, AUXILIARY is a directory that connects directories of removable storage media. The AUXILIARY directory is a directory which, when a removable auxiliary storage medium is connected to a playback device, connects to the directory of the removable storage medium. The ROMDAT directory is a directory that connects the directories of the actual removable optical disc. The BDMV directory is a directory of AV data generated during execution of an application by using AV data or application data of the ROMDAT directory and AV data or application data of another directory. In addition, according to the implementation example, the above-described directory name may be changed, and an exact path name of the PERSISTENT directory name currently used in the playback device may be determined through an application program interface (API) such as getDirectoryName ("PERSISTENT").

 For example, in the case of an application in the movie mode, an application execution object is extracted from the MovieObject.bdmv file in the BDMV directory and executed by the above-described navigation engine. The state of the application in the movie mode to be executed operates according to the state diagram as shown in FIG.

FIG. 10 is a diagram for describing a file directory structure generated during the initialization 510 of the application illustrated in FIG. 5.

Referring to FIG. 10, the application manager 318 initializes 510 an application to be executed after finishing the initialization 500 of the application execution environment as illustrated in FIG. 5.

The initialization of the application 510 is to create an application execution directory with respect to a directory created in the file system on the memory through the initialization of the application execution environment 500, load the application file (app.jar) or to the actual storage medium Linking with a stored application file.

On the other hand, J2SE, which is a Java of the conventional sun microsystem, uses a storage directory on a storage medium as an execution directory. Therefore, when a Java application that requires file writing is stored in a read-only storage medium, writing to the storage medium is impossible and thus the execution of the application fails.

However, in the playback apparatus according to the present invention, an execution directory is created in a file system on a memory, and an execution directory on the memory is loaded by loading an application file (app.jar) or by connecting with an application file stored in an actual storage medium. Since both reading and writing are possible, even if an application file is stored in a read-only storage medium, it can be executed.

Hereinafter, a method of playing video data and interactive content will be described based on the configuration of a playback device according to the present invention described above.

11 is a flowchart illustrating a method of playing video data and interactive content according to an exemplary embodiment of the present invention.

Referring to FIG. 11, in order to reproduce interactive content together with video data, first, an execution environment of an application is initialized (step 1100). As described above, initialization of the application execution environment includes creating a directory such as BDMV, TEMPORAL, PERSISTENT, AUXILIARY, ROMDAT, etc. in a file system on a memory. Next, the application to be executed is initialized (step 1102). That is, a process of creating an application execution directory, loading an application file, or connecting an application file stored in an actual storage medium with respect to a directory created in a file system on a memory through initialization of an application execution environment. After the application is initialized, it operates according to the life cycle of each application. When the life cycle of the application ends (step 1104), the running application is terminated (step 1106). That is, the process of deleting the generated application execution directory is included. The initialization / termination process of the application (steps 1102 to 1106) may be repeated while there are applications to be executed, and if there are no more applications to be executed (step 1108), the application execution environment is terminated (step 1110). . That is, the directory managing the volatile memory (TEMPORAL directory) is deleted, and control is transferred from the engine running the application to the application manager.

The above-described application execution environment and the initialization / termination process of the application may be performed in the case of mode switching to change the execution mode in addition to the life cycle of the application.

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical disk, and the like, and may also include those implemented in the form of carrier waves (eg, transmission over the Internet). do. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The above description is only one embodiment of the present invention, and those skilled in the art may implement the present invention in a modified form without departing from the essential characteristics of the present invention. Therefore, the scope of the present invention should not be limited to the above-described examples, but should be construed to include various embodiments within the scope equivalent to those described in the claims.

As described above, according to the present invention, there is provided a reproducing apparatus for reproducing moving picture data and interactive contents and a reproducing method thereof. Accordingly, it is possible to provide additional functions such as a program function for providing an interactive function with the user in addition to the reproduction of the moving picture data, and a browsing function for reproducing related information from the markup document.

The playback apparatus according to the present invention supports a program mode such as a Java application as well as a markup language, and thus is more suitable for creating and operating an application program such as a game or a chat than a conventional interactive DVD playback apparatus using a markup language. It is convenient.

In addition, by creating an execution directory on a memory separate from a storage directory of an application file on a medium, the application can be executed even when a Java application having a writing function is stored in a read-only storage medium.

Furthermore, the execution directory on the memory can be connected to other directories on the memory to allow file sharing among applications, and a directory connected to nonvolatile local storage can be provided to provide easy access to nonvolatile storage media.

In addition, the initialization and termination of the application execution environment are performed by the application manager, so that each application does not need to manage each file generated by the playback apparatus at the end of execution of the application or switching of the execution mode. As a result, a problem in memory management, such as the application being terminated incorrectly and running out of memory when executing another application, can be solved.

1 is a view showing an example of a playback device for playing video data and interactive content according to an embodiment of the present invention;

2 is a diagram showing an example of a hardware configuration of a playback apparatus according to a preferred embodiment of the present invention;

3 is a view showing an example of the configuration of the software of the playback device according to a preferred embodiment of the present invention;

4 is a view for explaining a process of the application manager 318 shown in FIG. 3 controls the playback of interactive content;

5 is a view for explaining a process of the application manager 318 initializes / terminates the application execution environment and the application according to the present invention;

FIG. 6 is a view for explaining an example where the application life cycles 512 and 522 shown in FIG. 5 are applied to a movie mode.

FIG. 7 is a diagram for explaining an example in which the application life cycles 512 and 522 illustrated in FIG. 5 are applied to a program mode.

FIG. 8 is a diagram for describing an example in which the application life cycles 512 and 522 illustrated in FIG. 5 are applied to a browser mode.

FIG. 9 is a view for explaining a file directory structure generated during the initialization 500 of the application execution environment shown in FIG. 5;

FIG. 10 is a diagram for describing a file directory structure generated in the process of initializing an application 510 of FIG. 5;

11 is a flowchart illustrating a method of playing video data and interactive content according to an exemplary embodiment of the present invention.

Claims (19)

In the playback device for playing back video data and interactive content, A presentation engine for decoding and playing the video data; An application engine for interpreting and playing back the interactive content; And And an application manager for controlling playback of the video data and playback of the interactive content. The method of claim 1, The interactive content includes a programmable Java application and a markup language application using a markup document. The application engine includes a program engine for executing a Java application and a browser engine for executing a markup language application. The method of claim 1, And reproducing the interactive content from at least one of a removable storage medium, a local storage storage medium, and a storage medium on a network. 4. The playback device of claim 3, wherein the application manager finds an application to be executed first when the removable storage medium is inserted into the playback device. The playback apparatus of claim 1, wherein the application manager initializes an application execution environment before executing the application. The method of claim 5, wherein the initialization of the application execution environment refers to a directory managing video data, a directory managing nonvolatile memory, a directory managing volatile memory, and a directory managing removable storage medium in a file system on a memory. And a directory initialization. The playback apparatus of claim 5, wherein the application manager performs the application initialization after the application execution environment initialization is performed and before the application engine executes the application. 8. The reproduction of claim 7, wherein the application initialization creates an execution directory of the application on a memory and manages the execution directory in a file system of a memory separately from a storage directory of the application on a storage medium. Device. 6. The playback apparatus of claim 5, wherein the application manager performs an application execution environment termination when the application to be executed no longer exists or when switching to another application execution mode. 10. The reproducing apparatus according to claim 9, wherein the application execution environment terminating deletes contents of an execution directory of the application and a directory managing the volatile memory. The reproducing apparatus according to claim 1, wherein the application manager controls to operate according to a predetermined execution life cycle defined in the application engine when the application is executed in the application engine. 12. The playback apparatus of claim 11, wherein in the movie mode, the application has an execution state of any one of an active state and a stopped state. 12. The playback apparatus of claim 11, wherein in the Java application execution mode, the application has an execution state of any one of a load, a stop, an active state, and an extinction state. 12. The playback apparatus according to claim 11, wherein in the markup language application mode, the application has an execution state of any one of a load, an operation, and an end state. In the playback method for playing back video data and interactive content, (a) initializing an application execution environment; (b) initializing the application; (c) terminating the running application when the life cycle of the application ends; And and (d) terminating the application execution environment when there are no more applications to be executed or when switching the execution mode. The method of claim 15, The step (a) may include initializing a directory to refer to a directory managing the video data, a directory managing a nonvolatile memory, a directory managing a volatile memory, and a directory managing a removable storage medium in a file system on a memory. The playback method characterized in that. The method of claim 15, The step (b) is a step of creating an execution directory of the application on the memory, and managing the execution directory in the file system of the memory separately from the storage directory of the application on the storage medium. The method of claim 15, The step (c) is to delete the contents of the execution directory of the application. The method of claim 15, And (d) deleting the contents of the directory managing the volatile memory.