JP2019110495A - Client, system, method, and program for establishing ip broadcast session - Google Patents

Abstract

To provide a system etc. which can shorten processing delay as much as possible without providing a sense of incongruity when a user switches a channel even in IP broadcast.SOLUTION: A server includes a program specific information (PSI)/service information (SI) information distribution means that sequentially distributes PSI/SI information including tuning information and address information in moving image content of a plurality of channels to clients through one session. The client includes a session establishing means that executes a session establishment sequence toward address information of each channel when the client receives the PSI/SI information and a video content receiving means that receives a video content via a session for a channel based on channel selection. In particular, the session establishing means executes a session establishing sequence toward address information of a plurality of channels without being interlocked with the user's tuning operation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technology for establishing an IP (Internet Protocol) multicast broadcast session.

  2. Description of the Related Art Conventionally, there is a technology of a receiving apparatus that shortens the time of channel scan processing for terrestrial digital broadcast (see, for example, Patent Document 1). According to this technology, when NIT (Network Information Table) information included in SI (Service Information, program arrangement information) is received, a reception frequency band and a channel are allocated. Specifically, based on the NIT acquired during the channel scanning process, the frequency band in which channel information is already known is distinguished from the frequency band in which channel information is not known. The scanning process is continued to search for channel information only for frequency bands for which channel information is not known. This can reduce the overall time taken to scan the channel.

Similarly, in the IP broadcast, SI necessary for the configuration of an EPG (Electronic Program Guide, electronic program guide) is distributed from the server to the client via a dedicated IP session. Here, for example, about 15 minutes are required to transfer program information for about 8 days by the SI. Therefore, real-time property is not ensured.
On the other hand, the IP broadcast server distributes PSI (Program Specific Information) information to the client in a cycle of about 2 seconds, as in terrestrial digital broadcast. By this, it is going to secure the real time property in program information.

JP, 2011-61496, A

However, according to the PSI information in the above-described IP broadcast, the client waits for up to about 2 seconds, causing a first delay.
Further, in the case of IP broadcast, the client needs to establish a session in advance in order to receive the content stream of the channel selected by the user. A session is established between an IP broadcast server or a router where an IP multicast Join has been established. Here, after the client is normally tuned by the user, it takes time to establish the session to execute the session establishment sequence, resulting in a second delay.
Furthermore, the content stream received via the session needs to be decrypted using a key because it is encrypted. This decoding process also takes time, and a third delay occurs.

Such stacking of the first to third delays is uncomfortable to the user, particularly in the case of the “zapping operation”. The zapping operation is an operation in which the user frequently switches channels to the remote control. In this case, the user feels strange that the moving image is not reproduced immediately despite the channel switching.
In particular, the second delay required to execute the session establishment sequence does not occur in digital broadcasting that can always receive broadcast contents of all channels.
Therefore, in the case of IP broadcasting, it is extremely difficult to instantly switch the display of moving image content when performing a zapping operation to switch channels frequently.

  Therefore, it is an object of the present invention to provide a client, system, method, and program capable of reproducing moving picture content as smoothly as possible without the user having a sense of incongruity at the time of channel switching even in IP broadcast. Do.

According to the present invention, in a client that receives and reproduces moving image content from a server that distributes moving image content for each channel in IP (Internet Protocol) broadcasting,
PSI / SI information receiving means for sequentially receiving PSI (Program Specific Information) / SI (Service Information) information including tuning information and address information in moving image content of a plurality of channels from one server through one session;
Session establishing means for executing a session establishment sequence toward address information of each channel when PSI / SI information is received;
A channel based on channel selection is characterized by comprising: moving image content receiving means for receiving moving image content via a session.

According to another embodiment of the client of the invention:
It is also preferable that the session establishing means execute a session establishing sequence toward address information of a plurality of channels without being interlocked with the user's tuning operation.

According to another embodiment of the client of the invention:
Address information of a plurality of channels to be subjected to the session establishment sequence is
Address information of all channels included in PSI / SI information,
Among channels included in PSI / SI information, address information of a channel selected based on a first predetermined flag described in the PSI / SI information, or
Among the channels included in the PSI / SI information, it is preferable that the address information of the channel selected based on the second predetermined flag stored in advance in the client.

According to another embodiment of the client of the invention:
The first predetermined flag is a tear bit that can be controlled by the server and is associated with contract availability for each channel,
It is also preferable that the second predetermined flag is a tear bit that can be controlled by the client and is associated with the availability of viewing for each channel.

According to another embodiment of the client of the invention:
Video content is encrypted data,
The session establishing means acquires the decryption key of the video content for each channel at the time of session establishment,
It is also preferable that the moving image content receiving unit decrypts the moving image content received through the session of the channel using a decryption key of the channel based on the user's channel selection.

According to another embodiment of the client of the invention:
Video content is delivered by TS (Transport Stream) packets,
The address information included in the PSI / SI information is an address of a server or router of a content delivery network (CDN), and is preferably included in a network information table (NIT).

According to the present invention, there is provided a system comprising a client and a server as described above,
The server includes video thumbnails for each channel in PSI / SI information distributed to clients,
The client is characterized by further comprising moving picture thumbnail display means for outputting moving picture thumbnails corresponding to the channel to the display device during decoding processing time of the moving picture content received through the session of the selected channel. Do.

According to another embodiment of the system of the present invention,
Video thumbnails are unencrypted data,
8. The system according to claim 7, wherein the moving picture thumbnail display means displays, on the display device, one moving picture in which moving picture thumbnails of all the channels received from the server are arranged without decoding.

According to another embodiment of the system of the present invention,
The client displays the moving image thumbnail of the selected channel on the display device while expanding it during the decryption processing time of the encrypted moving image content, and when the decoding of the moving image content is completed, the client It is also preferable to switch to video content.

According to another embodiment of the system of the present invention,
The client also preferably synchronizes the video thumbnail with the video content.

According to the present invention, there is provided a moving image content receiving method of a system comprising: a server for distributing moving image content for each channel in IP broadcast; and a client for receiving and reproducing the moving image content.
A first step of the server sequentially delivering PSI / SI information including tuning information and address information in video content of a plurality of channels to a client through one session;
A second step of performing a session establishment sequence towards the address information of each channel when the client receives PSI / SI information;
The client has a third step of receiving moving image content via a session for a channel based on channel selection.

According to the present invention, there is provided a program that causes a computer mounted on a client that receives and reproduces moving image content from a server that distributes moving image content for each channel in IP broadcasting to function.
PSI / SI information receiving means for sequentially receiving PSI (Program Specific Information) / SI (Service Information) information including tuning information and address information in moving image content of a plurality of channels from one server through one session;
Session establishing means for executing a session establishment sequence toward address information of each channel when PSI / SI information is received;
For a channel based on channel selection, the computer functions as a moving image content receiving unit that receives moving image content via a session.

  According to the client, system, method, and program of the present invention, even with IP broadcast, it is possible to reproduce moving picture content as smoothly as possible without the user having a sense of incongruity at the time of channel switching.

It is a basic sequence diagram in the present invention. It is explanatory drawing showing the descrambler of a content stream. FIG. 10 is a sequence diagram using PSI / SI information including a moving image thumbnail. FIG. 6 is a screen view showing switching of display of a moving image thumbnail and moving image content. It is a sequence diagram at the time of zapping which a user repeats channel selection. When a client receives PSI / SI information, it is a sequence diagram which selects the channel which should establish a session. It is a function block diagram of the client in the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a basic sequence diagram in the present invention.

The IP broadcast server 2 distributes the video content for each channel to the client 1 via the IP network. The video content delivered here is broadcast type content, and is a multicast stream multiplexed at the TS (Transport Stream) packet level.
The client 1 reproduces the received video content toward the display device 3. According to FIG. 1, the client 1 is a set top box installed in the home, and the display device 3 is a television that the user views.

According to FIG. 1, the sequence is performed as follows.
(S0) First, the client 1 establishes one dedicated session with the IP broadcast server 2. This session is for delivering shared program information and control information to all channels, and is different from the session for each channel for transmitting moving image content.

(First Step: S1) The IP broadcast server 2 sets “PSI (Program Specific Information) / SI (Service Information) information” including “channel selection information” and “address information” in moving image contents of a plurality of channels, It delivers sequentially to the client 1 via the previously established dedicated session.

A TS packet can use a plurality of programs, and has a logical hierarchical structure as follows. This hierarchical structure is transmitted by PSI information (transmission control signal).
[network]->[TS]-> [program (service)]-> [ES (component)]
[network]: A collection of multiple TS packets
[program]: A set of ESs contained in TS packets, which means the tuning of the user
[ES] (Elementary Stream): each medium (component) that composes the program

In PSI information, the following table is defined as "tuning information".
PAT (Program Association Table): Table showing relationship of TS-> program PMT (Program Map Table): Table showing relationship of program-> ES CAT (Conditional Access Table): Table showing information related to conditional access control NIT ( Network Information Table): A table showing the relationship between network and TS

The “station selection information” and the “address information” are included in the “NIT” of the PSI / SI information for moving image content of a plurality of channels.
"Address information" is the address (and port number) of a server or router of a content delivery network (CDN).

In addition, "SI" is regarded as a part of PSI and treated as PSI / SI information. Specifically, SI includes all information of EPG, and also includes the above-mentioned NIT.
Therefore, for example, when receiving SI information from the IP broadcast server 2 executed at the time of resetting the client 1, or when receiving PSI information from the IP broadcast server 2 received in a cycle of about 2 seconds. Even then, it is determined that the first step S1 has been performed.

(Second Step: S2) When the client 1 receives PSI / SI information, it executes a session establishment sequence toward the address information of each channel.
Here, "when the network information table is received" means that the establishment of a session is started without being interlocked with the user's tuning operation. It also means that the establishment of a session is initiated toward address information of a channel other than one channel, ie, a plurality of channels, based on the user's tuning operation.

  Also, the client 1 acquires the decryption key of the moving image content for each channel when establishing a session. The decryption key will be described later with reference to FIG.

  The client 1 may store the NIT and may determine whether the address information has been updated, as compared with the newly received NIT. When the address information is updated, a session establishment sequence is executed to the new address information. On the other hand, the session for the address information which is not included in the new NIT is disconnected.

(Third Step: S3) Then, the client 1 receives video content via a session for a channel based on channel selection.
When the display device 3 is, for example, a television, the user can transmit an infrared signal from the possessed remote control to the client 1. The client 1 (or television) can switch channels by channel selection based on the received infrared signal. Specifically, the content request is transmitted via the session corresponding to the switched channel. Thereby, moving image content can be received.

  FIG. 2 is an explanatory diagram showing a descrambler of a content stream.

According to FIG. 2, at the time of session establishment, the client 1 acquires the decryption key of the moving image content for each channel. That is, the decryption key is obtained in advance for the channel in which the session has been established.
On the other hand, the moving image content is encrypted data. Specifically, the scramble key is acquired by decrypting ECM (Entitlement Control Message, common information) included in the content stream of TS using a decryption key acquired in advance. This is based on the authentication of CAS ((Conditional Access System) client, and the scramble key is obtained by the authentication success.

  Then, the TS content stream (moving image content), which is encrypted data, is decoded by the descrambler using the scramble key. The moving image content output from the descrambler is output to the display device 3.

FIG. 3 is a sequence diagram using PSI / SI information including a moving image thumbnail.
FIG. 4 is a screen view showing switching of display of moving image thumbnails and moving image contents.

(S1) According to FIG. 3, in comparison with FIG. 1, the "moving image thumbnail" for each channel is included in the PSI / SI information.
A moving image thumbnail (thumb nail) is a moving image that is reduced by reducing the amount of information from the original moving image content. The size and the image quality are reduced, and it is like a "sample" for allowing the user to determine whether to view moving image content.
According to the present invention, specifically, the NIT includes a moving image thumbnail for each channel. Since these moving image thumbnails are non-encrypted data, they do not require ECM decryption processing or content stream decryption processing.

(S2) According to FIG. 3, the client 1 displays on the display device 3 one moving image in which moving image thumbnails of all the channels received from the IP broadcast server 2 are arranged (see FIG. 4 (a)). The plurality of moving image thumbnails are arranged, for example, in n rows and m columns. Each moving image thumbnail may be an icon that can be selected for viewing (pressed) by the user.

(S3) It is assumed that ch3 is selected by the operation of the user. At this time, the client 1 transmits a content request via the ch3 session. At the same time, the client 1 outputs the moving image thumbnail of ch 3 to the display device 3.
Then, the client 1 receives the moving image content of ch3 through the session of the selected channel. Since the video content is encrypted, the client 1 needs to decrypt the video content.

The client 1 receives the moving image content from the channel selection of ch 3 by the user, and outputs the moving image thumbnail of ch 3 to the display device 3 during the decoding processing time. Meanwhile, it is preferable that the client 1 display the moving image thumbnail of ch 3 on the display device 3 while enlarging it. Then, when the decoding of the moving image content is completed, the moving image thumbnail is switched to the moving image content. At this time, the moving image thumbnail and moving image content are synchronized.
As a result, when viewed from the user who views the television of the display device 3, the selected moving image thumbnail is switched to the moving image content seamlessly and smoothly while being enlarged (see FIG. 4B).

  FIG. 5 is a sequence diagram at the time of zapping where the user repeats channel selection.

(Ch3) The establishment of the session and the reproduction of the moving image content of ch3 are exactly the same as FIG. 3 described above.
(Ch4) It is assumed that ch4 is selected by the operation of the user. At this time, the client 1 transmits a content request via the ch4 session. At the same time, the client 1 outputs the moving image thumbnail of ch 3 to the display device 3.
(Ch5) It is assumed that the user switches to ch5 channel selection immediately after ch4 channel selection. At this time, the client 1 transmits a content request via the ch5 session without receiving the ch4 moving image content. At the same time, the client 1 outputs the moving image thumbnail of ch 5 to the display device 3.
Then, the client 1 receives the moving image content based on the channel selection of ch5, and outputs the moving image thumbnail of ch5 to the display device 3 during the decoding processing time. Meanwhile, the client 1 displays the moving image thumbnail of ch5 on the display device 3 while enlarging it. Then, when the decoding of the moving image content is completed, the moving image thumbnail is switched to the moving image content.

  FIG. 6 is a sequence diagram for selecting a channel to establish a session when the client receives PSI / SI information.

According to the above-described embodiment, the session establishment sequence is executed for the address information of all channels included in the PSI / SI information.
On the other hand, according to the following embodiment, the channel to establish a session can be selected on the IP broadcast server 2 side or the client 1 side.

According to FIG. 6A, of the channels included in the PSI / SI information, the session establishment sequence for the address information of the channel selected based on the first predetermined flag described in the PSI / SI information. Run.
The first predetermined flag may be a tear bit that can be controlled by the IP broadcast server 2 and is associated with contract availability for each channel.

According to FIG. 6 (b), among the channels included in the PSI / SI information, the session establishment sequence is executed for the address information of the channel selected based on the second predetermined flag stored in advance in the client 1. doing.
The second predetermined flag may be a tear bit that can be controlled by the client and is associated with the availability of viewing for each channel.

  FIG. 7 is a functional block diagram of the client in the present invention.

  According to FIG. 7, the client 1 has a PSI / SI information receiving unit 11, a moving image thumbnail display unit 111, a session establishing unit 12, a decryption key storage unit 121, a moving image content receiving unit 13, and a descrambler 131. The station selection information receiver 14 and the moving image content display unit 15 are provided. These functional components are realized by executing a program that causes a computer installed in the client to function. Of course, the flow of processing of these functional components can also be understood as a moving picture content reception method.

[PSI / SI information receiver 11]
The PSI / SI information receiving unit 11 sequentially receives PSI / SI information in moving image content of a plurality of channels from the IP broadcast server 2 through one session. The channel selection information and address information for each channel included in the NIT of the received PSI / SI information is output to the session establishment unit 12. Also, the moving image thumbnail for each channel included in the NIT of PSI / SI information is output to the moving image thumbnail display unit 111.

[Video thumbnail display section 111]
During the decoding processing time of the moving image content received via the session of the selected channel, the moving image thumbnail display unit 111 outputs the moving image thumbnail corresponding to the channel to the display device 3.

[Session establishment unit 12]
When the PSI / SI information is received, the session establishing unit 12 executes a session establishing sequence toward the address information of each channel. In particular, the session establishment sequence is executed toward the address information of a plurality of channels without being linked to the user's tuning operation.
Also, at the time of session establishment, the session establishment unit 12 acquires the decryption key of the moving image content for each channel, and stores the decryption key in the decryption key storage unit 121.
Furthermore, the session establishing unit 12 outputs, to the descrambler 131, the tier bit described in the PSI / SI information, in which the contract availability for each channel is associated.

[Decryption key storage unit 121]
The decryption key storage unit 121 stores the decryption key of the moving image content for each channel output from the session establishment unit 12.

[Video Content Receiver 13]
The moving image content receiving unit 13 receives moving image content via a session for a channel based on channel selection. Specifically, the content request is sent to the channel address information, and the moving image content is received. The received moving image content is output to the descrambler 131.

[Descrambler 131]
The descrambler 131 decrypts the encrypted moving image content received through the session of the channel using a channel decryption key based on channel selection. The decoded video content is output to the video content display unit 15.

[Channel selection information receiver 14]
The channel selection information receiving unit 14 outputs, to the descrambler 131, channel selection information received from the user, or a tier bit associated with the pre-stored availability of viewing / listening to each channel.

[Video Content Display Unit 15]
The moving image content display unit 15 outputs the moving image content decoded by the descrambler 131 to the display device 3 via the display interface.

  As described above in detail, according to the client, system, method, and program of the present invention, it is possible to shorten the processing delay as much as possible without causing the user to feel discomfort when switching channels, even for IP broadcast. it can.

According to the present invention, the client does not incur a second delay to establish the session, since it has already established the session before being tuned by the user.
Also, while decrypting the encrypted content stream, the user can view the moving image thumbnail and can switch between the moving image thumbnail and the moving image content seamlessly and smoothly. Not uncomfortable
Specifically, when switching channels by the zapping operation, it is possible to make the user experience natural channel switching as much as possible.

  For the various embodiments of the present invention described above, various modifications, corrections and omissions of the scope of the technical idea and aspect of the present invention can be easily made by those skilled in the art. The above description is merely an example and is not intended to be limiting in any way. The present invention is limited only as defined in the following claims and the equivalents thereto.

Reference Signs List 1 client, set top box 11 PSI / SI information reception unit 111 video thumbnail display unit 12 session establishment unit 121 decryption key storage unit 13 moving image content reception unit 131 descrambler 14 channel selection information reception unit 15 moving image content display unit 2 IP broadcast server 3 Display, TV

Similarly, in the IP broadcast, SI necessary for the configuration of an EPG (Electronic Program Guide, Electronic Program Guide) is distributed from the server to the client via a dedicated IP session. Here, for example, about 15 minutes are required to transfer program information for about 8 days by the SI. Therefore, real-time property is not ensured.
On the other hand, the IP broadcast server distributes PSI (Program Specific Information) information to the client in about 2 minutes , as in terrestrial digital broadcast. By this, it is going to secure the real time property in program information.

However, according to the PSI information in the above-described IP broadcast, the client waits for up to about 2 minutes, causing a first delay.
Further, in the case of IP broadcast, the client needs to establish a session in advance in order to receive the content stream of the channel selected by the user. A session is established between an IP broadcast server or a router where an IP multicast Join has been established. Here, after the client is normally tuned by the user, it takes time to establish the session to execute the session establishment sequence, resulting in a second delay.
Furthermore, the content stream received via the session needs to be decrypted using a key because it is encrypted. This decoding process also takes time, and a third delay occurs.

According to the present invention, in a client that receives and reproduces moving image content from a server that distributes moving image content for each channel in IP (Internet Protocol) broadcasting,
From the server, the PS I information receiving means for a PSI (Program Specific Information) information including tuning information and address information in the video content of the plurality of channels, receives sequentially through a single session,
A session establishing means for executing a session establishment sequence toward address information of each channel included in the NIT of the PSI information when PSI information is received;
For channel based on channel selection, and having a video content receiving means for receiving the dynamic image content.

According to another embodiment of the client of the invention:
Address information of a plurality of channels to be subjected to the session establishment sequence is
Address information of all channels included in NIT ,
Among the channels included in the NIT , address information of a channel selected based on a first predetermined flag described in the NIT , or
Among the channels included in the NIT , it is also preferable that the address information is a channel selected based on a second predetermined flag stored in advance in the client.

According to another embodiment of the client of the invention:
Video content is delivered by TS (Transport Stream) packets,
Address information included in the NIT, it is also preferred Ru server or router address der of the CDN (Content Delivery Network).

According to the present invention, there is provided a system comprising a client and a server as described above,
The server includes the video thumbnail for each channel in the NIT delivered to the client,
The client is characterized by further comprising moving picture thumbnail display means for outputting moving picture thumbnails corresponding to the channel to the display device during decoding processing time of the moving picture content received through the session of the selected channel. Do.

According to the present invention, there is provided a moving image content receiving method of a system comprising: a server for distributing moving image content for each channel in IP broadcast; and a client for receiving and reproducing the moving image content.
Server, a first step of delivering the PS I information including tuning information and address information in the moving image content of a plurality of channels sequentially through a single session to a client,
Client, when receiving the PS I information, a second step of performing the session establishment sequence toward each channel address information contained in the NIT of the PSI information,
Client, the channel based on the channel selection, and having a third step of receiving moving-image content.

According to the present invention, there is provided a program that causes a computer mounted on a client that receives and reproduces moving image content from a server that distributes moving image content for each channel in IP broadcasting to function.
From the server, the PS I information receiving means for the PS I information including tuning information and address information in the video content of the plurality of channels, receives sequentially through a single session,
A session establishing means for executing a session establishment sequence toward address information of each channel included in the NIT of the PSI information when PSI information is received;
For channel based on channel selection, and characterized by causing a computer to function as a moving image content receiving means for receiving the moving-image content.

In addition, "SI" is regarded as a part of PSI and treated as PSI / SI information. Specifically, SI includes all information of EPG, and also includes the above-mentioned NIT.
Therefore, for example, when receiving SI information from the IP broadcast server 2 executed when the client 1 is reset, or when receiving PSI information from the IP broadcast server 2 received in about 2 minutes. Even then, it is determined that the first step S1 has been performed.

Claims (12)

In a client that receives and plays back moving image content from a server that distributes moving image content for each channel in IP (Internet Protocol) broadcasting,
PSI / SI information receiving means for sequentially receiving PSI (Program Specific Information) / SI (Service Information) information including tuning information and address information in moving image contents of a plurality of channels from one of the servers through one session ,
Session establishing means for executing a session establishment sequence toward address information of each channel when the PSI / SI information is received;
And a moving image content receiving unit for receiving moving image content via a session for a channel based on channel selection. The client according to claim 1, wherein the session establishment unit executes a session establishment sequence toward address information of a plurality of channels without being interlocked with a user's tuning operation. Address information of a plurality of channels to execute the session establishment sequence is:
Address information of all channels included in the PSI / SI information,
Among the channels included in the PSI / SI information, address information of a channel selected based on a first predetermined flag described in the PSI / SI information, or
The client according to claim 2, wherein among the channels included in the PSI / SI information, address information of a channel selected based on a second predetermined flag stored in advance in the client. The first predetermined flag is a tear bit that can be controlled by the server and is associated with contract availability for each channel,
4. The client according to claim 3, wherein the second predetermined flag is a tear bit that can be controlled by the client and is associated with the availability of viewing for each channel. The video content is encrypted data,
The session establishing means acquires a decryption key of video content for each channel at the time of session establishment,
5. The video content receiving means according to any one of claims 1 to 4, wherein the video content receiving means decrypts the video content received through the session of the channel using a decryption key of the channel based on the user's channel selection. Client described in. The video content is distributed by TS (Transport Stream) packets,
The address information included in the PSI / SI information is an address of a server or a router of a content delivery network (CDN), and is included in a network information table (NIT). The system described in item 1. A system comprising the client according to any one of claims 1 to 6 and the server,
The server includes a moving image thumbnail for each channel in the PSI / SI information to be distributed to the client.
The client further includes moving picture thumbnail display means for outputting, to a display device, a moving picture thumbnail corresponding to the channel during decoding processing time of the moving picture content received through the session of the selected channel. And the system to be. The video thumbnail is non-encrypted data,
8. The system according to claim 7, wherein said moving picture thumbnail display means displays, on a display device, one moving picture in which moving picture thumbnails of all channels received from said server are arranged without decoding. The client displays the moving image thumbnail of the selected channel on the display device while expanding the channel during the decryption processing time of the encrypted moving image content, and when the decoding of the moving image content is completed, from the moving image thumbnail The system according to claim 8, characterized by switching to the moving picture content. The system of claim 9, wherein the client synchronizes the video thumbnail with the video content. A moving image content receiving method of a system comprising: a server for distributing moving image content for each channel in IP broadcasting; and a client for receiving and reproducing the moving image content.
A first step of sequentially delivering PSI / SI information including tuning information and address information in moving image contents of a plurality of channels to a client through one session;
A second step of performing a session establishment sequence towards the address information of each channel when the client receives the PSI / SI information;
A third step in which the client receives moving image content via a session for a channel based on channel selection. A program for causing a computer mounted on a client to receive and play moving image content from a server that distributes moving image content for each channel in IP broadcasting to function.
PSI / SI information receiving means for sequentially receiving PSI (Program Specific Information) / SI (Service Information) information including tuning information and address information in moving image contents of a plurality of channels from one of the servers through one session ,
Session establishing means for executing a session establishment sequence toward address information of each channel when the PSI / SI information is received;
A program causing a computer to function as moving image content receiving means for receiving moving image content via a session for a channel based on channel selection.

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