JPH08161240A - Multimedia data processing system - Google Patents

Abstract

PURPOSE: To improve the efficiency of the distribution to respective receivers of the same data such as special news data or the like in a video on-demand service or the like. CONSTITUTION: This multimedia data processing system 101 is provided at least with an information processor 102, a cable television connection device 103 for sending out multimedia data streams to the information processor 102 and a television receiver 104 to which the processing result of the information processor 102 is inputted and performs the processing of multimedia data transferred by the data streams. The information processor 102 is provided with a combination processing part 106 for combining a special news stream 202 with a video data stream 201 during the processing of the multimedia data of the video data stream 201 and outputs the respective multimedia data of the video data stream 201 and the special news stream 202 to the television receiver 104.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing technique for a system which handles multimedia data such as video and audio, and more particularly to video on demand (when required, for delivering a large number of video streams). In order to efficiently deliver the same data stream such as temporary news to each receiving device in a communication system in which one receiving device occupies one channel (for example, a desired video program can be provided immediately). It relates to a suitable multimedia data processing system.

[0002]

2. Description of the Related Art In broadcast type media such as a television, instead of sharing one channel with many receivers, the bandwidth of a data transmission path can be made large. For this reason, it is not necessary to encode (encode) the transmission data, and it is easy to broadcast the broadcast data after overlapping the temporary news telop and the like with the pre-broadcast data. on the other hand,
In a video-on-demand service, basically, one channel (video data stream) is occupied by one receiver, so the bandwidth of the data transmission path is limited to a smaller number as the number of receivers increases. It Therefore, it is necessary to encode the video data.

In such a video-on-demand service, in order to combine the temporary news data on the transmitting side, it is necessary to use different channels for transferring different video data.
It is necessary to decode once, overlap the temporary news telop, and encode again, which increases the processing overhead. Further, the temporary news telop does not need to be combined at the time of video recording, but in the conventional technique, the combination cannot be suppressed because it has already been combined at the time of broadcasting.

Conventionally, a plurality of multimedia data streams are processed, such as a mechanism for synchronizing a plurality of multimedia data streams being processed, such as audio and image of video data in video on demand. The technology is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-265778 and Japanese Patent Application Laid-Open No. 5-265781. However, in these technologies, for example, video
On-demand multimedia data stream processing that efficiently combines new processing requests such as temporary news with distributed video data cannot be performed. That is, it is not easy to combine processing of other multimedia data such as temporary news during processing of multimedia data such as video data.

[0005]

The problem to be solved by the prior art is that in the prior art, it is possible to easily combine the processing of another multimedia data such as temporary news during the processing of multimedia data such as video data. It is impossible for each receiver to control whether or not it is necessary to deliver the same data such as temporary news data to each receiver. An object of the present invention is to solve the problems of these conventional techniques and to efficiently deliver the same data such as temporary news data to each receiver in a system in which one receiver occupies one channel such as a video-on-demand service. It is to provide a multimedia data processing system that can perform well.

[0006]

In order to achieve the above object, the multimedia data processing system of the present invention comprises:
(1) Information processing device 102 for processing multimedia data, data source device (cable television connection device 103) for transmitting a data stream of multimedia data to this information processing device 102, and information processing device 102 And a data target device (television receiver 104) to which the processing result of (1) is input, and is a multimedia data processing system 101 for processing multimedia data exchanged in a data stream, the information processing device 102 is the first data stream (video data stream 201)
During the processing of the multimedia data of the second data stream (temporary news stream 2) consisting of multimedia data different from this first data stream.
02) is combined with a first data stream, and a combination processing unit 106 is provided for combining the first and second data streams.
The multimedia data of each stream is output to the television receiver 104 together. (2) In the multimedia data processing system according to (1), the first data stream is a plurality of substreams (a set of a plurality of substreams 30.
1), dummy data is assigned to at least one of the substreams (dummy data stream 302), and the combination processing unit 106 outputs the second data.
When the stream is accepted, the second data stream is processed as a substream to which the dummy data of the first data stream is assigned, and the second data stream is processed.
It is characterized in that the multimedia data of the stream is output instead of the dummy data. (3) In the multimedia data processing system according to (1) or (2), at least the first data stream is composed of a plurality of substreams including mutual synchronization information 402 and 404. , Combination processing unit 106
Is characterized by performing a combination process of the first and second data streams regardless of the synchronization information. Further, (4) in the multimedia data processing system according to any one of (1) to (3) above, an instruction from the operator as to whether or not to perform a combined process of the first and second data streams is given. Operation accepting device 10 for accepting
9, and the combination processing unit 106 uses the operation reception device 109.
Is determined based on the instruction from the operator accepted by the user. (5) In the multimedia data processing system according to any one of (1) to (4) above, a level value discriminating unit 107 for discriminating a level value added in advance in the second data stream is provided. The combination processing unit 106a is characterized by determining whether to perform the combination process of the first and second data streams based on the determination result of the level value determination unit 107. (6) In the multimedia data processing system according to any one of (1) to (5), the level value designated by the operator is stored,
A comparison unit 108 for comparing the stored level value and the level value added in advance in the second data stream is provided, and the combination processing unit 106a determines whether the first and the second data values are obtained based on the comparison result of the comparison unit 108. It is characterized by determining whether or not to perform a combination process of two data streams. (7) In the multimedia data processing system according to any one of (1) to (6), the data source device is a line connection means (cable television connection device) for receiving a data stream via a communication line. 10
3), the first data stream is transmitted in response to a request from its own system, the second data stream is broadcast, and the combination processing unit 106
The second data that has been broadcast during the output processing of the multimedia data of the first data stream.
Combining the streams into a first data stream. Also, (8) above (1) to (7)
In the multimedia data processing system according to any one of items 1 to 3, the data source device is a cable television connection device 103, the data target device is a television receiver 104, and the information processing device 102 is a multimedia delivered by a cable television service. It is characterized by performing media processing. (9) In the multimedia data processing system according to any one of (1) to (8), a recording device 110 for recording the processing result of the multimedia data by the information processing device 102b is provided. When outputting to, the combination processing unit 106b does not perform combination processing of the first and second data streams, and outputs only the first data stream. (10) In the multimedia data processing system according to any one of (1) to (9), the first data stream is a video data stream 201 distributed by a cable television service, The second data stream is a data stream (temporary news stream 20) broadcast on a cable television service.
2) is a feature. (11) In the multimedia data processing system according to any one of (1) to (10), the first data stream is a video data stream 201 distributed by a video-on-demand service. It is characterized by being. (12) In the multimedia data processing system according to any one of (1) to (11) above,
The second data stream is characterized by being a temporary news telop image. (13) In the multimedia data processing system according to any one of (2) and (3) above, one of the substreams of the first data stream is a video image, and the second data stream is It is characterized by being a temporary news telop image. (14) In the multimedia data processing system according to any one of (1) to (13) above, the combination processing unit 106 converts the multimedia data of each of the first and second data streams into one image. The image is synthesized and displayed on the television receiver 104. (15) In the multimedia data processing system according to any one of (1) to (13) above, the combination processing unit 106 respectively converts the multimedia data of each of the first and second data streams. It is characterized in that the images are combined as separate images and displayed on the television receiver 104 in a multi-window manner.

[0007]

In the present invention, a plurality of multimedia streams are prepared, and video data is stored in one of them, for example.
Temporary news data is put on another one, and both streams are combined on the receiving side. At this time, since the temporary news data can be broadcast, the bandwidth of the transmission path is constant regardless of the number of receivers. As a result, the temporary news plotter in the video-on-demand service can be efficiently distributed. Also, video data and temporary news data are separate streams, which can be separated on the receiver side and can be processed individually. Then, whether or not to combine both of these streams is determined based on the operator, a predetermined level value, or a predetermined receiving device (target device). This allows the operator on the receiving side to select and obtain different multimedia data processing results as necessary, and for example, the television receiver outputs and displays the temporary news plot along with the video. However, it is possible to prevent the temporary news plot from being recorded on the video tape.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the configuration of the multimedia data processing system of the present invention according to the present invention. In FIG. 1, 101 is a multimedia data processing system according to the present invention, 102 is an information processing device (shown as a computer in the figure) that includes a CPU and performs processing by a storage program method, and 103 is a data source according to the present invention. A cable television connection device which is an example of a line connection device as a device, 104 is a television receiver (described as a television device in the drawing) which is an example of a data target device according to the present invention, and 105 is processing of multimedia data. A multimedia processing unit 106 performs a combination processing unit that performs a combination process of multimedia data streams according to the present invention. A reference numeral 107 indicates an operator who determines whether or not the combination processing unit 106 performs a combination process of a plurality of data streams. Is an operation acceptance device that accepts the instruction.

In this embodiment, a video data stream 2 as the first data stream according to the present invention
01 and the temporary news stream 202 as the second data stream are transferred from the cable television connection device 103 to the information processing device 102. The information processing apparatus 102 causes the multimedia processing unit 105 and the combination processing unit 106 to execute the video data stream 2
01 and the temporary news stream 202 are combined and processed, and then the combined video data stream 2 is processed.
03 and Extraordinary News Stream 2 after Combination Processing
As 04, it is transferred from the information processing apparatus 102 to the television receiver 104. Further, the operator instruction 211 is transferred from the operation reception device 107 to the information processing device 102.

The operation of the information processing apparatus 102 according to the present invention will be described below with reference to FIG. FIG. 6 is a flowchart showing an operation example of the multimedia data processing system in FIG. 1 according to the present invention. First, on-demand video connection is performed based on the operator instruction 211 in FIG. 1 (step 501). Next, it is checked whether the connected video data stream 201 of FIG. 1 is the end (step 502), and if the end of the video data stream 201 is detected, the processing is ended. If the video data stream 201 of FIG. 1 continues, it is checked whether the temporary news stream 202 of FIG. 1 is coming (step 503). If the temporary news stream 202 in FIG. 1 has not come, as shown in FIG. 1, the video data stream 201 is used as the video data stream 203 after the combination processing, as shown in FIG.
04 (Nothing is sent as the temporary news stream 204 after the combination process) (step 506). Then, the process returns to step 502.

In step 503, if the temporary news stream 202 of FIG. 1 is coming, the operator instruction 211 in FIG. 1 is checked. If the combination processing ON is not instructed (step 504), the process proceeds to step 506. If so, as shown in FIG. 1, both the video data stream 203 after the combination process and the temporary news stream 204 after the combination process, if indicated,
Send to television receiver 104, then step 5
Return to the process of 02.

Next, the details of the processing operation of the combination processing unit 106 of FIG. 1 in step 505 will be described with reference to FIG. FIG. 9 is a flow chart showing an example of the processing operation of the combination processing unit in FIG. 1 according to the present invention. First, it is checked whether or not a screen for temporary news has already been displayed on the television receiver 104 of FIG. 1 (step 511). If it has already appeared, the video data stream 201 of FIG.
It is sent to the video screen of the television receiver 104 in FIG. 1 as a video data stream 203 after combination processing, and the temporary news stream 20 in FIG.
2 is sent to the screen for temporary news of the television receiver 104 in FIG. 1 as the temporary news stream 204 after the combination processing (step 513). Step 5
If the screen for the temporary news is not displayed in 11, the screen for the temporary news is generated (step 51).
2) Go to step 513.

Next, the type of data stream will be described with reference to FIG. 8 according to the difference in connection form. Figure 8
It is explanatory drawing which shows the kind of data stream which concerns on this invention. Plural multimedia data processing system 101
A and 101B are cable television lines 121, respectively.
Different video data streams 201A, 201 above
B is connected. On the other hand, when the temporary news stream 202 is sent over the cable television line 121, both the multimedia data processing systems 101A and 101B are connected to the same temporary news stream 202.

As described above, according to the first embodiment, a plurality of multimedia data processing systems 101A and 10A are provided.
1B can be connected to different video data streams 201A and 201B on demand, and even if the video data streams 201A and 201B are connected together, the temporary news stream 202 is shared, so that the cable TV Bandwidth consumption on line 121 is reduced. Also, the temporary news stream 202
Since it is sent to another screen for temporary news, it will not be confused with the video data streams 201A and 201B on the screen.
1, it is possible to suppress the screen display of temporary news.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2, 10 and 11. FIG. 2 shows a second configuration of the multimedia data processing system according to the present invention.
10 is a block diagram showing an embodiment of the present invention, FIG. 10 is a flowchart showing an operation example thereof, and FIG. 11 is a flowchart showing an operation example of a data stream combination process according to the present invention.

The configuration of the multimedia data processing system 101a in FIG. 2 is the same as that of the multimedia data processing system 101 of the first embodiment in FIG. 1 according to the present invention. A level value discriminating unit 108 for discriminating, a level value designated by the operator are stored, and the stored level value and a level value previously added to the data stream discriminated by the level value discriminating unit 108 are stored. The configuration is such that a comparison unit 109 for performing the comparison of 1 is provided. In this embodiment, the level value discriminating unit 108 and the comparing unit 109 are provided in the combination processing unit 106a.

With such a configuration, in the first embodiment shown in FIG. 1, the video data stream 203 after the combination processing and the temporary news stream 204 after the combination processing are the information processing apparatus. 2 is transferred from the information processing apparatus 102 to the television apparatus 104 in the second embodiment of FIG.
Transferred to Regarding such a processing operation, different parts of the flowchart of FIG. 10 and the flowchart of FIG. 6 will be described.

In FIG. 6, in the processing of step 504, the operator directly specifies the combination processing ON and the information processing apparatus 102 checks this, but in FIG. 10, instead of the processing of step 504, , Step 521 is performed. That is, the operator indicates a certain level value, and on the other hand, another level value is added to the temporary news stream (202), and the level value determination unit 108 in FIG. 2 determines this level value, Further, the comparing unit 109 in FIG. 2 compares the both. As a result, when the level value added to the temporary news stream is larger than the operator-specified level value, the process proceeds to step 505, and when not, the process proceeds to step 506.

In the second embodiment, the combination processing operation of the data streams performed by the combination processing unit 106a of FIG. 2 in step 505 is different from the processing operation of the combination processing unit 106 of FIG. The operation will be described with reference to FIG. 11, in the processing of step 531, the image data of the video data stream 201 and the image data of the temporary news stream 202 in FIG. 2 are combined into one image data, and the combined data stream 205 after the combination processing is obtained. , To the television device 104 of FIG.

As described above, according to the second embodiment, the image data of the video data stream 201 and the image data of the temporary news stream 202 in FIG. 2 are combined into one image data. The TV device does not need the multi-window function. Further, in FIG. 2, it is possible to select whether or not to perform the combination process using the level value added to the temporary news stream 202,
It is possible to send only urgent extraordinary news to the television device.

Next, a third embodiment of the present invention will be described with reference to FIGS. 3 and 12. FIG. 3 is a block diagram showing a third embodiment of the multimedia data processing system of the present invention according to the present invention, and FIG. 12 is a flowchart showing an operation example of the present invention. First, differences between the configuration of the multimedia data processing system 101b shown in FIG. 3 and the configuration of the multimedia data processing system 101a shown in FIG. 2 described as the second embodiment will be described. A multimedia data processing system 101b as the third embodiment in FIG. 3 includes a video data stream 201 including a recording device 110 such as a video tape recorder in addition to the configuration of the multimedia data processing system 101a in FIG. The video copy stream 206, which is a copy of the
From the recording device 110 to the recording device 110.

The operation of the multimedia data processing system 101b having such a configuration will be described in the difference between the flowchart of FIG. 12 and the flowchart of FIG. 6 described in the first embodiment. Step 5 in FIG.
In the processing of 04, the operator directly specifies the combination processing ON, and the combination processing unit 106 checks this.
In step 2, instead of the processing in this step, step 54
Process 1 is performed. In the process of step 541, it is checked whether the target device defined by the operator instruction 211 in FIG. 3 is the television device 104 in FIG. 3 or the recording device 110. If the target device is the television device 104, the process proceeds to step 505, and if the target device is the recording device 110,
The process proceeds to step 506. According to the third embodiment, the operator can watch the television with the temporary news on the television device 104 in FIG. 3, while the operator can record without the temporary news on the recording device 110 in FIG.

Next, the structure of the data stream according to the present invention will be described with reference to FIGS. 4 and 5. FIG.
FIG. 5 is an explanatory diagram showing a configuration example of a substream in a data stream according to the present invention, and FIG. 5 is an explanatory diagram showing a configuration example in which another data stream is replaced in the data stream in FIG. 4. In FIG. 4, the video data stream 201 is configured as a set 301 of a plurality of substreams. At least one substream of the set 301 of the plurality of substreams is the dummy data stream 302. In FIG.
The dummy data stream 302 in FIG. 4 has been replaced by the temporary news stream 202. As described above, according to the fourth embodiment, since the bandwidth is secured in advance by the dummy data stream 302 in the video data stream, a new bandwidth is required when the temporary news stream 202 is connected. No need to secure.

Next, another example of the structure of the data stream according to the present invention will be described with reference to FIG. FIG. 7 is an explanatory diagram showing synchronization information in a substream in a data stream according to the present invention. In FIG. 7, the video data stream 201 is configured as a set 301 of a plurality of substreams. A set 301 of a plurality of substreams includes an image data substream 303 that sends image information 401 and an audio data substream 304 that sends audio information 403. Furthermore, the image data substream 303 and the audio data substream 3 are included.
04 sends synchronization information 402, 404.

On the other hand, the temporary news stream 202
Sends only image information 405, 406. This allows
The image data substream 303 and the audio data substream 304 can be synchronized, while the image data substream 303 and the temporary news stream 202 need not be synchronized. As described above, according to the fifth embodiment, it is possible to process the temporary news stream 202 regardless of the synchronization schedule between the substreams included in the video data stream 201.

As described above with reference to FIGS. 1 to 12, in the multimedia data processing system of this embodiment, the increase in the transfer bandwidth is suppressed to a low level, the overhead of encoding / decoding does not occur, and the temporary news Can be broadcast, and the display of temporary news can be suppressed if necessary. The present invention is
The embodiment is not limited to the embodiment described with reference to FIGS. 1 to 12, and various modifications can be made without departing from the scope of the invention. For example, the level value determination unit and the comparison unit are
Although the configuration is provided inside the combination processing unit, the configuration may be provided outside the combination processing unit. Further, in FIG. 10, in the processing of step 521, when the comparison result of the comparison unit indicates that the level value added to the temporary news stream is larger than the operator-specified level value, the processing proceeds to step 505. , When the level value added to the temporary news stream is smaller than the operator-specified level value,
It is also possible to proceed to the processing of step 505.

[0027]

As described above, according to the present invention, the increase of the transfer bandwidth can be suppressed to a low level, and the occasional news or the like can be broadcast without causing the encoding / decoding overhead, so that multimedia data such as video data can be transmitted. While processing, you can easily combine processing of other multimedia data such as occasional news,
Whether or not it is necessary to deliver the same data such as temporary news data to each receiver can be controlled by each receiver side, and one channel is occupied by one receiver such as a video-on-demand service. In this system, the same data such as temporary news data can be efficiently distributed to each receiver.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a configuration according to the present invention of a multimedia data processing system of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the configuration of the multimedia data processing system of the present invention according to the present invention.

FIG. 3 is a block diagram showing a third embodiment of the multimedia data processing system of the present invention according to the present invention.

FIG. 4 is an explanatory diagram showing a configuration example of a substream in a data stream according to the present invention.

5 is an explanatory diagram showing a configuration example in which another data stream is replaced in the data stream in FIG.

6 is a flowchart showing an operation example of the multimedia data processing system in FIG. 1 according to the present invention.

FIG. 7 is an explanatory diagram showing synchronization information in a substream in a data stream according to the present invention.

FIG. 8 is an explanatory diagram showing types of data streams according to the present invention.

9 is a flowchart showing an example of the processing operation according to the present invention of the combination processing unit in FIG.

10 is a flowchart showing an operation example of the multimedia data processing system in FIG. 2 according to the present invention.

FIG. 11 is a flowchart showing an operation example of data stream combination processing according to the present invention.

12 is a flowchart showing an operation example of the multimedia data processing system in FIG. 3 according to the present invention.

[Explanation of symbols]

101, 101a, 101b, 101A, 101B: multimedia data processing system, 102, 102a,
102b: information processing device, 103: cable television connection device, 104: television receiver, 105: multimedia processing unit, 106, 106a, 106b: combination processing unit, 107: operation receiving device, 108: level value determination unit, 109: comparison unit, 110: recording device, 121: cable television line, 201, 201A, 201B: video data stream, 202: temporary news stream, 203: video data stream after combination processing, 204: after combination processing Temporary news stream, 205: combined data stream after combination processing, 206: video copy stream, 301: set of multiple substreams, 302: dummy data stream, 303: image data substream, 30
4: audio data substream, 401, 405, 40
6: image information, 402, 404: synchronization information, 403: audio information

Front page continued (72) Inventor Toshiyuki Kuwana 5-2-1 Omika-cho, Hitachi City, Hitachi, Ibaraki Co., Ltd. Inside Hitachi Mimika Factory (72) Inventor Masato Manda 5030 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Company Hitachi, Ltd. Software Development Division (72) Inventor Shinji Kimura 1099, Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Stock Company, Hitachi, Ltd. System Development Laboratory (72) Eriko Koda, 1099, Ozen-ji, Aso-ku, Kawasaki, Kanagawa Hitachi, Ltd. System Development Laboratory (72) Inventor Masaaki Iwasaki 1099, Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Stock Company Hitachi Systems Development Laboratory

Claims (15)

[Claims] 1. An information processing apparatus for processing multimedia data, a data source apparatus for transmitting a data stream comprising the multimedia data to the information processing apparatus, and a processing result of the information processing apparatus are input. At least a data target device,
A multimedia data processing system for processing multimedia data exchanged in a stream, wherein the information processing device is configured to communicate with the first data stream during processing of the multimedia data of the first data stream. A combination processing means for combining a second data stream of different multimedia data with the first data stream, wherein the multimedia data of each of the first and second data streams together A multimedia data processing system characterized by outputting to a target device. 2. The multimedia data processing system according to claim 1, wherein the first data stream comprises a plurality of substreams, and dummy data is assigned to at least one of the substreams. The processing means, when receiving the second data stream, processes the second data stream as a substream to which the dummy data of the first data stream is allocated, and outputs the second data stream. A multimedia data processing system which outputs multimedia data of a stream instead of the dummy data. 3. The multimedia data processing system according to claim 1 or 2, wherein at least the first data stream comprises a plurality of substreams containing mutual synchronization information, The multimedia data processing system, wherein the combination processing means performs combination processing of the first and second data streams without depending on the synchronization information. 4. The multimedia data processing system according to claim 1, further comprising an instruction from an operator as to whether or not to perform the combined processing of the first and second data streams. An operation accepting means for accepting is provided, and the combination processing means determines whether or not to perform the combination processing of the first and second data streams based on the instruction from the operator accepted by the operation accepting means. A multimedia data processing system characterized by. 5. The multimedia data processing system according to any one of claims 1 to 4, further comprising a level value determining means for determining a level value added in advance in the second data stream, The multimedia data processing system, wherein the combination processing means determines whether or not to perform the combination processing of the first and second data streams based on the determination result of the determination means. 6. The multimedia data processing system according to claim 1, wherein a level value designated by the operator is stored, and the stored level value and the second data are stored. Comparison means for comparing the level value added in advance in the stream is provided, and the combination processing means performs the combination processing of the first and second data streams based on the comparison result of the comparison means. A multimedia data processing system characterized by determining whether or not. 7. The multimedia data processing system according to any one of claims 1 to 6, wherein the data source device comprises line connection means for receiving the data stream via a communication line. The first data stream is transmitted in response to a request from its own system, the second data stream is broadcast, and the combination processing means is configured to transmit the first data stream.
A multimedia data processing system, characterized in that the second data stream broadcast during the output processing of multimedia data of a stream is combined with the first data stream. 8. The multimedia data processing system according to claim 1, wherein the data source device comprises a cable television connection device, and the data target device comprises a television receiver. A multimedia data processing system, wherein the information processing device processes multimedia distributed by a cable television service. 9. The multimedia data processing system according to claim 1, further comprising recording means for recording a processing result of the multimedia data by the information processing device, and the recording means stores the result. A multimedia data processing system, wherein at the time of output, the combination processing means does not perform the combination processing of the first and second data streams and outputs only the first data stream. 10. The multimedia data processing system according to claim 1, wherein the first data stream is a video data stream delivered by a cable television service, and the first data stream is a video data stream delivered by a cable television service. Multimedia data processing system, characterized in that the second data stream is a data stream broadcast in a cable television service. 11. The multimedia data processing system according to claim 1, wherein the first data stream is a video data stream distributed by a video on demand service. A multimedia data processing system characterized by the above. 12. The multimedia data processing system according to claim 1, wherein the second data stream is a temporary news telop image. 13. The multimedia data processing system according to claim 2 or 3, wherein one of the substreams of the first data stream is a video image, and the second data is the second data stream. A multimedia data processing system characterized in that the stream is a temporary news telop image. 14. The multimedia data processing system according to any one of claims 1 to 13, wherein one image of multimedia data of each of the first and second data streams is obtained by the combination processing means. The multimedia data processing system is characterized in that the image is synthesized and displayed on the data target device. 15. The multimedia data processing system according to any one of claims 1 to 13, wherein the combination processing means converts the multimedia data of each of the first and second data streams, respectively. A multimedia data processing system, characterized in that the images are combined as separate images and displayed in a multi-window on the data target device.