JP2003030085A - Content distribution system, content distribution controller, content distribution method and mobile terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately distribute accumulated contents to mobile terminal device when a session is reconnected. SOLUTION: When a session managing part 22 detects that connection with mobile terminal device 30 is cut by referring to a session managing table 25a, it informs a contents supply part 12 of the effect. The contents supply part 12 correspondingly changes the type of the contents during distribution. The changed contents is kept in accumulation DB 26 until connection with mobile terminal device 30 is resumed and it is distributed to mobile terminal device 30 after connection is resumed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a content distribution system, a content distribution control device, a content distribution method and a mobile terminal device for distributing appropriate contents to a mobile terminal device.

[0002]

2. Description of the Related Art In a communication service using a mobile terminal device such as a mobile phone device, the transmission rate is dramatically increasing due to technological innovation. With such a high transmission rate, it becomes possible to deliver image data such as still images and moving images or voice data such as music to the mobile terminal device in addition to the conventional call service and message service. .

In such a communication service, the communication state between the mobile terminal device and the base station changes with the movement of the mobile terminal device, and in some cases, the communication (session) is interrupted. When the above content is distributed by so-called streaming, the content being reproduced is interrupted.

A method for smoothly reconnecting when the session is disconnected in this way is disclosed in, for example, Japanese Patent Laid-Open No.
000-59760, JP 2000-15174.
No. 9 publication.

[0005]

However, in the technique described in the above publication, although the disconnected session can be reconnected smoothly, it is delivered when the session with the mobile terminal device is disconnected. The type of content that was used and the type of content that was delivered when the session was reconnected were the same.

Therefore, upon reconnection, only the same type of content as before the disconnection is delivered. Therefore, for example, when the content distributed before disconnection is data such as a moving image having a high bit rate, there is a problem that a large network load is applied at the time of distribution (that is, the data volume per unit time is large). It was

The present invention has been made in view of the above-mentioned problems, and when the session is reconnected, the content distribution system capable of appropriately distributing the stored content to the mobile terminal device, An object is to provide a content distribution control device, a content distribution method, and a mobile terminal device.

[0008]

In order to solve the above problems, a content delivery system according to the present invention is a content delivery system for delivering content to a mobile terminal device, in which a predetermined type of content is delivered to a mobile terminal. Content providing means that can be provided to the device, disconnection detecting means that detects that the connection with the mobile terminal device has been disconnected, and when the disconnection detecting means detects disconnection, provide the mobile terminal device before disconnection Content selection means for selecting a type of content according to the type of content that has been used, and content that is the type selected by the content selection means and should be provided to the disconnected mobile terminal device Storage means and restart detection means for detecting that the connection with the mobile terminal device has been restarted, and the restart detection means for restarting the connection. When issued, the content providing section, characterized in that it comprises a control means for providing a content accumulated in the accumulating means to the mobile terminal device.

The content type includes, for example, moving image, still image, character information, etc., content format,
Quality (rate [movie], size [still image]), etc. are included.

Further, the content distribution control device according to the present invention is a content distribution control device for controlling distribution of content to a mobile terminal device, and disconnection detecting means for detecting disconnection of the connection with the mobile terminal device. And when the disconnection detecting means detects the disconnection, the content providing means capable of providing the content of a predetermined type before the disconnection displays the content of the type corresponding to the type of the content provided to the mobile terminal device. The connection between the content selection means to be selected, the storage means for storing the content of the type selected by the content selection means and to be provided to the disconnected mobile terminal device, and the connection to the mobile terminal device are restarted. When the restart detection means detects that the connection has been restarted, the content providing means stores the accumulated data. Characterized in that it comprises a control means for providing a content accumulated in the mobile terminal device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a mobile phone device,
It can be applied to a content distribution system that distributes content such as moving images, music, or text to a PDA (personal information terminal) or the like.

(First Embodiment) (Structure) A content distribution system according to a first embodiment of the present invention is, for example, as shown in FIG. 1, a content distribution server device 10 for distributing contents, a network 1, and a network 1. It includes a distribution management device 20 that manages the distribution of content via the base station 2 and the like, and a mobile terminal device 30 such as a mobile phone device or PDA used by the user to use the content.

The content distribution server device 10 is composed of storage means such as a hard disk drive (HDD) device or the like, and a content database (content DB) holding contents such as moving images, music or texts.
11, a content providing unit 12 that provides the content held in the content DB 11, and an HTTP server 1 that provides the generated content to the mobile terminal device 30.
3 and 3.

The content DB 11 stores a plurality of types of content such as moving images, still images, music or text. For these contents, a plurality of contents having different types such as formats, compression ratios, qualities, and numbers of characters are prepared in advance for one target. Also, for one target, for example, a game such as soccer or baseball, a plurality of contents such as a moving image of a game, a still image, or character information indicating the progress of the game is prepared. Mobile terminal 3
From 0, for example, provision of content is requested in units of target. The content providing unit 12 determines which kind of content is provided by the mobile terminal device 30.
It is designed to be selected according to the state of communication up to.

Alternatively, instead of preserving a plurality of types of content in the content DB 11 and selecting the type of content provided at the time of provision,
Only one type of content may be stored in 11, and the content providing unit 12 may change the type of content (for example, compression rate) at the time of providing.

The distribution management device 20 also includes a connection control unit 21 for managing the connection between the mobile terminal device 30 and the network 1 via the base station 2, and the base station 2 and the mobile terminal device 30. A session management unit 22 that manages connections (sessions) between each other, and from the distribution server device 10 to the mobile terminal device 3 in response to an instruction from the session management unit 22.
Distribution management unit 23 that manages the distribution of contents to 0
And a communication DB 24 that holds information necessary for managing communication with the mobile terminal device 30, and a session DB 25 that holds a connection state and the like between the mobile terminal device 30 and the base station 2.
And a storage DB 26 for storing contents and the like between the disconnection of the connection between the mobile terminal device 30 and the base station 2 and the reconnection.

In the communication DB 24, each mobile terminal device 30 supplied from the connection control unit 21 by the distribution management unit 23.
The information such as the position of, the position where communication is impossible, and the like are held.

The session DB 25 also holds a session management table 25a for managing the distribution of content to each mobile terminal device 30.
In this session management table 25a, identification information (terminal ID) of each mobile terminal device 30 that receives distribution of content, position (terminal position), current connection state (current), and future connection state (future) are stored. The session state such as the state, the type of the provided content (moving image, still image and the like and the compression rate type), and the content state such as the delivery state are recorded in association with each other.

Further, the Web browser 32 is for reproducing the content provided from the distribution server device 10.
Video playback unit 32a, still image playback unit 32b, music playback unit 3
2c and the like. These reproduction units 32a to 32c
Is implemented as an extension program (so-called plug-in) of the Web browser 32, for example.

(Outline of Operation) The session management unit 22 manages the distribution of contents to the mobile terminal device 30 according to the communication DB 24 and the session management table 25a.

The session management unit 22 starts a connection (session) between the base station 2 and the mobile terminal device 30,
When the user operates the operation keys 34 to specify the target content (target), information indicating the specified target is changed to We
It is supplied from the b browser 32 to the HTTP server 13 via the base station 2, the network 1, and the distribution control device 20. At this time, for example, the distribution control device 20 communicates between the base station 2 and the mobile terminal device 30 (for example, so-called QoS (Quality of Service) such as communication rate and delay time).
Is also supplied to the HTTP server 13 together.

The information indicating these targets and the information indicating the communication state are transmitted from the HTTP server 13 to the content providing unit 12
Then, the content providing unit 12 selects an appropriate type of content from a plurality of types of content corresponding to the designated target, according to the state of communication to the mobile terminal device 30 and the like. Specifically, for example, a moving image content such as a compression rate and a bit rate is selected according to the communication rate between the base station 2 and the mobile terminal device 30. Alternatively, for example, in the case of the above-mentioned match or the like, if the QoS is good, a video with a bit rate corresponding to the QoS is selected, and the Q
If the oS is bad, a still image or character information may be selected.

The content providing unit 12 includes the mobile terminal device 3
When the content to be supplied to 0 is selected, the selected content is read from the content DB 11 and provision to the mobile terminal device 30 is started. Specifically, for example, moving image content is supplied to the Web browser 32 by so-called streaming. Such content is, in fact, for each data packet of a predetermined length,
It is supplied to the mobile terminal device 30 via the distribution control device 20, the network 1, and the base station 2.

In this way, when the contents are supplied,
The web browser 32 displays the provided content as a moving image,
Content provided by the moving image reproducing unit 32a, the still image reproducing unit 32b, and the music reproducing unit 32c is reproduced as appropriate depending on whether it is a still image, music, text, or the like.

The moving image reproduced by the moving image reproducing unit 32a, the still image reproduced by the still image reproducing unit 32b, and the like are displayed on the display unit 36 via the display control unit 37.
Alternatively, the audio output unit 39 drives the speaker 38 according to the sound reproduced by the music reproducing unit 32c, and the music is reproduced. Also, the provided content may be, for example, plain text, HTML (Hyper Text Markup Languag).
In the case of text data in e) format, XML (eXtensible Markup Language) format, etc., the Web browser 3
2 is displayed on the display unit 36 via the display control unit 37 according to the text information.

(Details of Operation) In this content distribution system, the operation for distributing the content for each data packet as described above is performed by directly supplying the data packet from the distribution server device 10 to the mobile terminal device 30. Depending on the distribution mode and the storage mode in which the data packet from the distribution server device 10 is temporarily stored in the storage DB 26 until the communication with the mobile terminal device 30 is reconnected and is provided to the mobile terminal device 30 after reconnection. To be executed.

The session management unit 22 manages in which mode the content is distributed for each mobile terminal device 30 according to the session state in the session management table 25a. Specifically, when the connection is established between the base station 2 and the mobile terminal device 30, the distribution of the content to the mobile terminal device 30 is set to the direct distribution mode, and between the base station 2 and the mobile terminal device 30. If the connection is cut off in step 1, the content distribution is performed in the accumulation mode until the communication with the mobile terminal device 30 is reconnected. It should be noted that a predetermined upper limit time may be set for the distribution of the content in this accumulation mode. This is for the effective use of communication resources because it is assumed that they will not be reconnected.

It is considered that the distribution of the contents is started in the state where the mobile terminal device 30 is connected to the base station 2, and therefore the contents are normally started in the direct distribution mode. In this direct delivery mode, for example, the processing shown in FIG. 2 is executed for each data packet described above. First, the session management unit 22
The session state in the session management table 25a is confirmed (S1), and it is determined whether or not a connection is established with the mobile terminal device 30 providing the content (S2). If the data packet is being connected, the data packet is transmitted to the mobile terminal device 30 (S3), and the process for the packet ends. After this, the processing from step S1 onward is started for the next data packet. Thereby, while the connection to the mobile terminal device 30 is established, the operation of the direct distribution mode is continued and the data packet of the content is appropriately supplied to the mobile terminal device 30.

On the other hand, when the connection with the mobile terminal device 30 is disconnected, the process proceeds from step S2 to step S4, the type of content to be stored is selected (step S4), and the storage mode is entered. For example, if the content delivered before disconnection was a moving image with a low compression rate, the content to be stored should be a movie with a high compression rate in order to reduce the data amount of the content to be delivered after reconnection. An image is selected, or a still image or character information is selected.

The selected content type is supplied to the content providing unit 12 via, for example, the distribution management unit 23 and the HTTP server 13, and the content providing unit 12 changes the content type read from the content DB 11. The content providing unit 12 is, for example, a moving image,
When distributing content such as music, the time position in the content being distributed is managed. Content DB
When changing the type of content read from 11,
The content providing unit 12 matches the time positions for reading. As a result, even if the type of content transmitted from the content providing unit 12 is changed, temporally continuous content can be provided.

Thus, when the connection is disconnected, the type of content provided by the content providing unit 12 is changed to, for example, moving image data having a high compression rate, so that the mobile terminal device 30 is reconnected. The amount of data of distributed contents is reduced, which can contribute to a reduction in network load during distribution.

As described above, instead of managing each packet, the same control as the above-mentioned management for each packet may be performed for each of a predetermined number of packets or higher blocks. Thereby, the control load can be reduced.

In the accumulation mode, the session management unit 22
Stores the data packets of the content addressed to the mobile terminal device 30 in the storage DB 26 sequentially. In parallel with the storage of such contents, the session management unit 22 executes
Is executed and the mobile terminal device 30 is executed every predetermined time.
It is monitored whether or not the connection between and is resumed (S1
1).

If the connection with the mobile terminal device 30 has not been resumed, the session management unit 22 continues the monitoring in step S11 at every predetermined time. When the connection with the mobile terminal device 30 is resumed, the session management unit 2
2 is for the mobile terminal device 30 and has a storage DB 2
The distribution of the contents stored in 6 is started (S12),
The transmission of the content is executed until the distribution of the accumulated content is completed (S12 to S13). Accumulation DB2
When the distribution of the content stored in 6 is completed, the session management unit 22 shifts to the direct distribution mode (S
14).

At this time, the content type is returned to the content type supplied to the mobile terminal device 30 before the connection is cut off. Specifically, the session management unit 22 provides the content providing unit 12 with information indicating that,
The content providing unit 12 changes the type of content read from the content DB 11.

As described above, the content stored in the storage mode is different from the content delivered to the mobile terminal device 30 before the connection is disconnected,
For example, the content has a high compression rate. Therefore, the data amount of the content distributed in steps S12 to S13 in FIG. 3 described above is smaller than when the content of the same type is simply held. Therefore, in this content distribution system, it is possible to reduce the data amount of the content distributed at the time of reconnection and contribute to the reduction of the load on the network.

(Second Embodiment) In the above-described first embodiment, contents to be distributed while the connection between the base station 2 and the mobile terminal device 30 is disconnected are accumulated in the accumulation DB 26. The stored content was distributed to the mobile terminal device 30 when reconnected.

On the other hand, in the content distribution system according to the second embodiment of the present invention, the disconnection and disconnection time of the connection between the base station 2 and the mobile terminal device 30 should be predicted and supplied within the disconnection time. Before the connection with the mobile terminal device 30 is disconnected, the content is distributed to the mobile terminal device 30 in advance, and the mobile terminal device 30 reproduces the distributed content within the disconnection time. ing.

(Structure) The content distribution system according to the second embodiment of the present invention has the same structure as that shown in FIG.

In this content distribution system, the session management unit 22 is different from the first embodiment described above.
The disconnection and disconnection time of the connection between the base station 2 and the mobile terminal device 30 are predicted, and the content to be distributed within the disconnection time is distributed to the mobile terminal device 30 in advance.

(Operation) Even if the coverage area of each base station 2 is integrated, for example, the base station 2 and the mobile terminal device 3 in a tunnel or the like.
There is a region where communication with 0 is not possible. In the communication DB 24, a region (hatched portion in FIG. 4) in which the mobile terminal device 30 and the base station 2 cannot communicate is held as, for example, information corresponding to the coordinates of the region (for example, a diagonal point). Rectangular area indicated by coordinates xa, ya and xb, yb).

The session management unit 22 refers to the session management table 25a for each mobile terminal device 30 at every predetermined time, and acquires the current position x (t), y (t) of the mobile terminal device 30. (S21 in FIG. 5), the movement amounts Δx and Δy per unit time are calculated from the position x (t−1) and y (t−1) of the mobile terminal device 30 that is separately held a predetermined time before. Ask.

The session management unit 22 operates the mobile terminal device 30 after a predetermined time from the movement amounts Δx and Δy thus obtained.
The position x (t + 1), y (t + 1) of (S2
2).

The positions x (t + 1) and y (t + 1) of the mobile terminal device 30 after the predetermined time are simply the current position of the mobile terminal device 30 as shown in the following equation, for example, in order to reduce the calculation load. It may be determined by adding the movement amounts Δx and Δy to x (t) and y (t).

X (t + 1) = x (t) + Δx y (t + 1) = y (t) + Δy Thus, the position x of the mobile terminal device 30 after a predetermined time
Upon obtaining (t + 1), y (t + 1), the session management unit 22 determines whether or not the position is a communicable position held in the communication DB 24 (S23). If the position of the mobile terminal device 30 after the predetermined time is within the communicable area, the session management unit 22 continues the same operation (for example, distribution of the predetermined content).

On the other hand, the mobile terminal device 3 after a predetermined time
If the position of 0 is not within the communicable area, the session management unit 22 uses, for example, linear complementation to determine the mobile terminal device 3
Position where communication with 0 becomes impossible (eg point a in Fig. 4)
And the time for which the communication is disconnected (for example, the moving time from point a to point b in FIG. 4) is calculated (S24).

In this way, when the time until disconnection and the disconnection time are obtained, the session management unit 22 reflects them in the session management table 25a (S25) and ends the processing.

The movement position of the mobile terminal device 30 is predicted by the so-called linear prediction by obtaining the movement amount from the current position of the mobile terminal device 30 and the position a predetermined time before, as described above. It is also possible to use a higher-order function to perform prediction using the position of the mobile terminal device 30 that is further ahead. Alternatively,
Information such as roads may be held, and prediction may be performed by limiting the movable range. By making such a prediction, the prediction accuracy can be improved.

In addition, the session management unit 22 judges whether or not it is necessary to supply the content to the mobile terminal device 30 in advance, for example, every predetermined time, in parallel with the above-mentioned processing, and it is necessary. If there is, for example, the processing shown in FIG. 6 is executed.

First, the session management unit 22 determines, according to the content to be delivered within the disconnection time and the time until disconnection.
The compression ratio of the required content is calculated (S31).

Further, the session management unit 22 selects the type of content corresponding to the obtained compression rate, and supplies the content providing unit 12 with information indicating the selected type (S).
32).

When such information is supplied, the content providing unit 12 changes the type of content provided to the mobile terminal device 30 (S33).

As a result, for example, moving picture content having a higher compression rate is supplied to the mobile terminal device 30. This content is also distributed to the mobile terminal device 30 within the disconnection time before the connection with the mobile terminal device 30 is disconnected.

Therefore, the mobile terminal device 30 can reproduce the content distributed before the disconnection within the disconnection time. Specifically, when changing the compression rate of the moving image, a predetermined time mark is defined in the data of the moving image, and therefore the moving image reproducing unit 32a performs reproduction according to this time mark. Further, when transmitting a still image or character information instead of a moving image, reproduction instruction information for instructing a reproduction time may be separately supplied, and the still image reproducing unit 32b or the Web browser 32 may perform such a reproduction instruction. Playback of still images and text information is controlled according to the information.

As a result, in this content distribution system, the mobile terminal device 30 can continue to reproduce the content without being affected by the communication state between the mobile terminal device 30 and the base station 2.

In the above description, the first embodiment and the second embodiment are independently described. However, for example, whether the provided content is a moving image, a still image, music, text, or the like. Separately, according to the communication state between the base station 2 and the mobile terminal device 30, etc., the content within the disconnection time is accumulated as in the first embodiment, or the disconnection time is as in the second embodiment. It may be possible to select whether to supply the content to be delivered to the mobile terminal device in advance by the estimated disconnection time.

The operation is selected, for example, by the session management unit 22 in advance with information indicating whether it is a moving image, a still image, music, text, etc., the base station 2 and the mobile terminal device 30. It can be set in association with information or the like indicating the communication state between them. As a result, it is possible to easily switch the operation mode according to the situation.

In the above description, the mobile terminal device 30
The content to be supplied to the above has been described in advance in the case of being stored in the content DB 11, but also for the above-mentioned contents such as baseball and soccer games, images of performances such as concerts, sounds generated in real time. The present invention can be applied. When delivering content such as a real-time moving image, for example, a video signal captured by a camera is converted into moving image data, which is sequentially compression-coded and transmitted to the mobile terminal device 30. The data rate at the time of this compression coding is set to the content type described above, and the content type is changed according to the communication state with the mobile terminal device 30. Specifically, for example, the content providing unit 12 generates moving image data having a low compression rate and a high data rate when the QoS with the mobile terminal device 30 is high, and the compression rate is high when the QoS is low. ,
The compression encoding is controlled so as to generate moving image data having a low data rate.

[0059]

In the content distribution system according to the present invention, when the disconnection detecting means detects that the connection with the mobile terminal device has been disconnected, the type of content provided to the mobile terminal device before the disconnection. The content of the selected type is stored in the storage means, and when the restart detection means detects that the connection with the mobile terminal device is restarted, the content is stored in the storage means. By providing the existing content to the mobile terminal device, when the connection with the mobile terminal device is reconnected, the content after the connection is disconnected can be delivered with an appropriate network load.

Further, in another content distribution system according to the present invention, content to be provided while the connection with the mobile terminal device is disconnected is provided before the connection with the mobile terminal device is disconnected. You can

As a result, it is possible to distribute the contents with reduced influence of the communication state with the mobile terminal device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a content distribution system according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation in a distribution mode of the content distribution system.

FIG. 3 is a flowchart showing an operation of the content distribution system in a storage mode.

FIG. 4 is a diagram for explaining the operation of the content distribution system according to the second embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of the content distribution system.

FIG. 6 is a flowchart showing an operation when the mobile terminal device constituting the content distribution system is reconnected to the base station.

[Explanation of symbols]

1 ... Network 2 ... Base station 10 ... Delivery server device 11 ... Content DB 12 ... Content provider 13 ... HTTP server 20 ... Delivery control device 21 ... Connection control unit 22 ... Session management unit 23 ... Delivery management unit 24 ... Communication DB 25 ... Session DB 25a ... session management table 26 ... Accumulation DB 30 ... Mobile terminal device 31 ... Communication I / F 32 ... Web browser 32a ... Video playback section 32b ... Still image playback unit 32c ... Music playback section 36a ... Display screen

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoko Kikuta             2-11-1, Nagatacho, Chiyoda-ku, Tokyo Stock             Ceremony company NTT Docomo (72) Inventor Tsutomu Yokoyama             2-11-1, Nagatacho, Chiyoda-ku, Tokyo Stock             Ceremony company NTT Docomo F-term (reference) 5K030 JT09 KA03 LB01 LE16

Claims (8)

[Claims] 1. A content distribution system for distributing content to a mobile terminal device, wherein a connection between the content providing means capable of providing a plurality of types of content to the mobile terminal device and the mobile terminal device is disconnected. Disconnection detecting means for detecting a disconnection, and content selecting means for selecting, when the disconnection detecting means detects disconnection, a type of content according to the type of content provided to the mobile terminal device before disconnection, Detecting that the type of content selected by the content selection means is a storage means for accumulating content to be provided to the disconnected mobile terminal device, and that the connection with the mobile terminal device is resumed Restart detection means, and when the restart detection means detects the restart of the connection, the content providing means stores the content in the storage means. And a control unit for causing the mobile terminal device to provide the content that has been set. 2. The supply means includes a holding means that holds a plurality of different types of contents in advance, or a generation means that generates different types of contents from predetermined contents.
Content distribution system described. 3. A content distribution system for distributing content to a mobile terminal device, the time until disconnection to the mobile terminal device,
Prediction means for predicting the period of disconnection, means for requesting content to be delivered to the mobile terminal device within the predicted disconnection period, and the requested content can be provided in the time until the disconnection A content distribution system comprising: a selection unit that selects the type of the content and a distribution unit that distributes the selected content to the mobile terminal device within the time until the disconnection. 4. A content distribution control device for controlling distribution of content to a mobile terminal device, comprising disconnection detecting means for detecting disconnection of the connection with the mobile terminal device, and disconnection detecting means for disconnecting the connection. Content selection means for selecting a type of content corresponding to the type of content provided to the mobile terminal device by the content providing means capable of providing a plurality of types of content before disconnection; A storage unit that stores the content that is of the type selected by the selection unit and that should be provided to the disconnected mobile terminal device, and detects that the connection with the mobile terminal device has been resumed. Resuming detecting means, and when the resuming detecting means detects resumption of connection, the contents providing means stores the accumulated information in the accumulating means. Content distribution control device, characterized in that it comprises a control means for providing content to the mobile terminal device. 5. A content distribution control device for controlling the distribution of content to a mobile terminal device, and a predicting means for predicting a time until the connection to the mobile terminal device is disconnected and a period during which the connection is disconnected. Means for requesting content to be delivered to the mobile terminal device within a predicted disconnection period, selection means for selecting the type of the content that can be provided in the time until the disconnection, And a distribution unit that distributes the generated content to the mobile terminal device within the time until the disconnection. 6. A content distribution method for distributing content to a mobile terminal device, the method comprising: detecting that the connection with the mobile terminal device has been disconnected; and, when the disconnection detecting means detects the disconnection. A step of selecting a type of content according to a type of content provided to the mobile terminal device by a content providing unit capable of providing a plurality of types of content before disconnection; A step of storing content to be provided to the mobile terminal device whose connection has been disconnected, a step of detecting that the connection with the mobile terminal device has been restarted, and a restart of the connection being detected by the restart detection means. In this case, the content providing means may be provided with control means for causing the mobile terminal device to provide the content stored in the storage means. Content delivery method according to claim. 7. A content distribution method for distributing content to a mobile terminal device, comprising: time until disconnection to the mobile terminal device;
Predicting a period of disconnection, requesting content to be delivered to the mobile terminal device within the predicted disconnection period, and providing the requested content in the time until the disconnection. A content distribution method comprising: a step of selecting a content type; and a step of distributing the selected content to the mobile terminal device within the time until the disconnection. 8. A time until a connection to a wireless base station and a mobile terminal device communicating with the wireless base station is disconnected, a period in which the connection is disconnected is predicted, and the predicted disconnection is performed. Content to be distributed within the period is supplied within the time until the disconnection, and the content reproduction device further comprises reproducing means for reproducing the supplied content within a period when the connection with the wireless base station is disconnected. Mobile terminal device.