JPH07297949A - Media information distribution system - Google Patents

Abstract

PURPOSE:To fully protect the copyright by providing a means for managing the distribution information of media information at a center equipment and managing recording information such as the title name of distributed media information or the number of prepared sheets of recording media. CONSTITUTION:A user selects the desired media information described in a media information managing table 38 according to a prescribed operating procedure while using a selecting information input means 35 on the side of a terminal. The selected media information ID or title, etc., is transferred to a managing means 31 and a distributing request is transmitted through a communication equipment 33 to the center equipment. When the distributing request is received by a communicating means 23, the center equipment transfers it to a managing means 24. The means 24 judges the ID of the distributing request and refuses the distribution of request except a prescribed ID. As for the prescribed ID, a storage position and an address is reported to a retrieving and extracting means 22 while referring to a media information managing table 25 and after terminal recording information is updated, the relevant media information is extracted from a media information storage means 21 and distributed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a media information delivery system for delivering media information such as music, images and programs via a public network such as a telecommunication network or a cable broadcasting network or a dedicated network.

[0002]

2. Description of the Related Art Generally, a CD on which music information is recorded or a cassette on which game software is recorded is manufactured in a factory and is sold to retailers or retail stores. However, recently, as the bandwidth and speed of communication transmission lines have increased, information is directly transferred to users via communication lines,
Systems aiming to reduce sales and service costs are gradually being deployed. For example, a system called communication karaoke is a system in which a center device converts music information for karaoke into a MIDI signal, sends the MIDI signal to a karaoke box through a communication line, and reproduces music for karaoke on the spot. According to this, it is not necessary to hold a large amount of karaoke LDs on the karaoke box side, unlike the conventional case.
In addition, the karaoke machine itself can be miniaturized, and it is expected to be a promising system in terms of effective use of space. Further, recently, in the United States, a proposal of a system for transferring music information of a CD to a store through a communication line, creating a CD on the spot, and selling it has been reported.

However, when media information such as music information is provided via a communication line in this way, the copyright may not be sufficiently protected. For example, in the above-mentioned online karaoke system, the copyright fee cannot be collected without knowing exactly which karaoke box used which music information and how many times. Also,
In a system that creates and sells CDs on the spot, the copyright fee cannot be reliably collected unless the number of created CDs and the like are accurately grasped.

[0004]

In such a system for providing media information via a communication line, it is possible to reduce sales costs and service costs, but there is a problem that copyright is not sufficiently protected. there were.

Therefore, an object of the present invention is to provide a media information delivery system capable of sufficiently protecting the copyright in a system for delivering media information via a communication line.

More specifically, when the media information is delivered from the center device to the terminal and recorded on a storage medium such as a CD, the center device can reliably manage the record information such as the title name and the number of created sheets. It is to provide a media information delivery system that can.

In addition, in a system in which media information is delivered from a center device to a terminal and recorded in a storage medium such as a CD, illegal recording can be prevented, that is, recording is not permitted except for an authorized terminal, or is authorized. It is to provide a media information delivery system that does not deliver media information to other terminals.

Another object of the present invention is to reduce the processing load on the center device side in a system for delivering media information from a center device to a terminal and recording it in a storage medium such as a CD.
It is an object of the present invention to provide a media information delivery system capable of simplifying the system in terms of the entire system.

Still another object of the present invention is to provide a media information delivery system capable of reducing communication cost in a system for delivering media information from a center device to a terminal and recording it in a storage medium such as a CD. Especially.

Still another object of the present invention is to provide media information to a user more quickly in a system for delivering media information from a center device to a terminal and recording it in a storage medium such as a CD. To provide an information delivery system.

[0011]

To achieve the above object, the present invention according to claim 1 is a media information delivery system for delivering media information from a center device to a terminal, wherein the center device sends the media information. Storage means for storing, first receiving means for receiving a delivery request for media information from the terminal, and searching means for searching the storage means for media information according to the delivery request received by the first receiving means. And a first transmitting means for transmitting the media information searched by the searching means to the terminal, and a managing means for managing delivery information relating to the media information transmitted by at least the first transmitting means. The terminal sends a selection means for selecting the media information for which delivery is requested and a delivery request for the media information selected by this selection means. Second transmitting means for transmitting to the input device, second receiving means for receiving the media information transmitted from the center device, and recording for recording the media information received by the second receiving means in a storage medium. And means.

According to a second aspect of the present invention, in a media information delivery system for delivering media information from a center device to a terminal, the center device stores a first storage means for storing the media information, and the media from the terminal. First receiving means for receiving a delivery request for information, searching means for searching the first storing means for media information corresponding to the delivery request received by the first receiving means, and searching by this searching means A first transmission means for transmitting the generated media information to the terminal, and a management means for managing at least delivery information relating to the media information transmitted by the first transmission means, and the terminal requests the delivery. Second selecting means for selecting information and a second transmission for transmitting a delivery request for the media information selected by the selecting means to the center device A second receiving means for receiving the media information transmitted from the center device, a second accumulating means for accumulating the media information received by the second receiving means, and the second receiving means. Recording means for recording the media information received by the above or the media information accumulated by the second accumulating means on a storage medium.

According to a third aspect of the present invention, in a media information delivery system for delivering media information from a center device to a terminal, the center device stores the media information and a delivery of the media information from the terminal. A first receiving means for receiving the request; a searching means for searching the storage means for media information corresponding to the delivery request received by the first receiving means; and an encryption of the media information searched by the searching means. Managing encryption means for encrypting, first transmitting means for transmitting the media information encrypted by the encrypting means to the terminal, and at least delivery information relating to the media information transmitted by the first transmitting means. Management means, the terminal selects the media information for which delivery is requested, and the selection means A second transmission means for transmitting a distribution request for the media information to the center apparatus, a second receiving means for receiving media information transmitted from the center apparatus,
It is characterized in that it is provided with a decoding means for decoding the media information received by the second receiving means, and a recording means for recording the media information decoded by the decoding means in a storage medium.

According to a fourth aspect of the present invention, in the media information delivery system for delivering the media information from the center device to the terminal, the center device stores the first media information and the terminal stores the media information. First receiving means for receiving a delivery request for information, searching means for searching the first storing means for media information corresponding to the delivery request received by the first receiving means, and searching by this searching means Selection for selecting the media information for which the terminal requests delivery, comprising first transmitting means for transmitting the sent media information to the terminal, and second receiving means for receiving the delivery information sent from the terminal Means, second transmitting means for transmitting a delivery request of the media information selected by the selecting means to the center device, and the second transmitting means for transmitting the media information delivery request from the center device. A third receiving means for receiving the media information, a recording means for recording the media information received by the third receiving means in a storage medium, and a delivery request by the second transmitting means or recording by the recording means The present invention is characterized by comprising a second accumulating means for accumulating the delivery information and a third transmitting means for transmitting the delivery information accumulated by the second accumulating means to the center device.

According to a fifth aspect of the present invention, in the media information delivery system for delivering the media information from the center device to the terminal, the center device stores the media information and the terminal is a regular terminal. Based on the response signal received by the first transmitting means for transmitting an inquiry signal for inquiring whether or not, the first receiving means for receiving the response signal from the terminal, and the response signal received by the first receiving means, Determining means for determining whether the terminal is a terminal, second receiving means for receiving a delivery request of media information from the terminal, and storing the media information according to the delivery request received by the second receiving means. Second searching means for searching from the means, and transmitting only the media information searched by the searching means to the terminal judged to be a legitimate terminal by the judging means. And transmission means, said terminal selecting means for selecting a media information delivery request,
Third transmitting means for transmitting a delivery request for the media information selected by the selecting means to the center device, third receiving means for receiving the media information transmitted from the center device, and the third receiving means Recording means for recording the media information received by the means on a storage medium, fourth receiving means for receiving the inquiry signal transmitted from the center device, and when the inquiry signal is received by the fourth receiving means And a fourth transmitting means for transmitting a predetermined response signal.

[0016]

In the present invention, since the delivery information regarding the media information delivered from the center device to the terminal is managed, the copyright can be surely protected.

In particular, according to the second aspect of the invention, since the terminal temporarily stores the media information delivered from the center device, the processing load on the center device side is reduced, the communication cost is reduced, and the media information is transmitted. It is possible to speed up the provision.

According to the third aspect of the invention, since the media information is encrypted and delivered from the center device to the terminal, it is possible to prevent illegal recording of the media information.

According to the fourth aspect of the present invention, the terminal manages the delivery information related to the media information delivered from the center apparatus to the terminal. Therefore, the processing load on the center apparatus side and the communication cost are reduced. be able to.

According to the fifth aspect of the present invention, since it is determined whether the terminal is a legitimate terminal and the media information is delivered only to the legitimate terminal, illegal recording of the media information can be prevented.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a media information delivery system according to an embodiment of the present invention. In the system shown in the figure, a terminal 12 having a media information storage means 37 and a terminal 11 having no media information storage means are connected to a center device 10 via a communication line 13. The center device 10 includes media information storage means 21.
Media information such as music, voice, video, characters, etc. stored in the media information storage means 21 is delivered to the terminals 11, 12 via the communication line 13. At the terminals 11 and 12, the delivered media information is recorded in a storage medium 14 such as a CD, and the storage medium 14 is delivered to the user. As the communication line 13, for example, an ISDN public network or a cable broadcasting network such as CATV can be used.

FIG. 2 is a block diagram showing the configuration of the center device 10. The center device 10 shown in the figure has a media information storage means 21 for storing media information including at least one of music, voice, video, characters, etc., and a search for searching and extracting media information from the media information storage means 21. The extraction unit 22, the communication unit 23 that receives the delivery request of the media information from the terminal and sends the media information extracted by the search and extraction unit 22 to the terminal, the delivery information about the media information delivered to the terminal, A media information management table 25 for storing the management information of the media information stored in the media information storage means 21 in a table format, and a management means 24 for managing the media information management table 25 are provided. Media information storage means 2
For example, a non-volatile storage medium such as a hard disk or a ROM, or a volatile storage medium such as a RAM is used for 1.
The communication unit 23 has a buffer function for absorbing the difference between the transmission speed to the communication line 13 and the read speed from the media information storage unit 21 when transmitting the media information to the communication line 13.

FIG. 3 is a diagram showing an example of the media information management table 25. A unique media information ID 51 for identifying each piece of media information is assigned to each piece of media information. As the media information ID, for example, in the case of music information, a worldwide common code such as an international recording code (ISRC) is used. In the media information management table 25 shown in FIG. 3, for each media information ID, a title 52 of the media information, a storage position (address) 55 of the media information in the media information accumulating unit 21, and a block size indicating the size of the accumulated data. 56, priority 5
7, information (terminal record information) 53 regarding recording of media information for each terminal, and a total recording number 54 of media information in all terminals are recorded. In the terminal record information 53, each terminal is managed by attaching a unique terminal ID. In the terminal record information 53, the number of times of recording the media information and the latest recording date and time are described for each terminal (terminal ID).
In the example of FIG. 3, the media information of MID3 is TID.
Recorded three times on one terminal. The latest recording date and time, that is, the third recording is 12th March, 1994.
Indicates that it was done at 15 minutes. The latest recording date and time is used to determine the priority order 57, for example. For example, even when the number of recordings is large, if the latest recording date and time is old (in the case of music information, hit songs in the past, for example), the priority is low. The priority order 57 is determined based on the issue date of media information (for example, the release date of a music piece), the total number of recording times of all terminals, the latest recording date and time, and the like. The priority is set to be higher for media information that is newer to the issue date, media information that is frequently recorded by the terminal, or media information that the center device intentionally wants to record in the terminal. The priority order 57 can be used as an evaluation criterion when the terminal stores media information. For example, media information that is frequently used is sent to the terminal in advance, communication with the terminal is reduced, and communication is performed according to traffic (for example, media information is sent to the terminal when traffic is low). However, the frequency of use at that time is evaluated using priority information. More specifically, media information with high priority is regarded as media information with high use frequency and is sent to the terminal in advance. The priority order 57 is used when the media information must be discarded from the media information storage means 21. Specifically, when the storage capacity of the media information in the media information storage means 21 exceeds the limit and the media information has to be discarded, the media information is sequentially discarded from the lowest priority 57.

FIG. 4 is a diagram showing the configuration of the terminal 11 which does not have the media information storage means shown in FIG. The terminal 11 shown in the figure transmits a request for delivery of desired media information to the center device 10 and a communication means 33 for receiving the media information transmitted from the center device 10, and a management means for managing the media information. 31, a media information management table 32 that lists media information that can be provided to the user, a recording unit 34 that stores the media information in a storage medium such as a CD, and a selection information input unit 35. The recording means 34 has a buffer function for absorbing the difference between the information transfer speed of the communication line and the recording speed of the recording means 34 when receiving and recording the media information. As the storage medium recorded by the recording means 34, in addition to the CD,
DAT, MD (mini disk), LD (laser disk), MO (magneto-optical disk), cassette tape, RA
There are M cassettes, IC memory, etc. Selection information input means 3
Reference numeral 5 is a user interface with the user, which is used for displaying guidance such as operating procedures of the system and a menu for selecting media information, and for inputting information necessary for selecting media information.

FIG. 5 is a diagram showing a procedure for delivering information between the terminal and the center device. The user uses the selection information input means 35 on the terminal side to select desired media information according to a predetermined operation procedure. The media information that can be selected by the user is described in the media information management table 32, and the media information ID indicating the type of media information and the title are downloaded from the center device in advance.
The selection information input means 35 transfers the selection information selected by the user to the management means 31 as information for uniquely identifying the media information such as the media information ID or the title. The management means 31 transmits information (delivery request) related to the corresponding media information based on the selection information to the center device via the communication device 33 (reference numeral 71 in FIG. 5). When receiving the delivery request from the terminal by the communication means 23, the center device transfers the delivery request to the management means 24.

FIG. 6 is a diagram showing an example of a format of a delivery request transmitted from the terminal to the center device. In the delivery request shown in the figure, the terminal ID of the sender of the delivery request, the media information ID of the media information desired by the user, the requested date and time, and an ID for specifying the user as an option (for example, the type or number of the credit card). Is described. The management means 24 examines the ID of this delivery request and determines the predetermined ID.
Others refuse delivery of media information to the terminal.
The management unit 24 refers to the media information management table 25 shown in FIG. 3, notifies the storage position and address, instructs the search / extraction unit 22 to extract the corresponding media information, and also sends the media information management table. The 25 terminal record information 53 and the like are updated. For example, when a delivery request for the media information of MID2 is received from the terminal of TID1, the number of times of storing the corresponding terminal record information 53 is updated and the latest recording date and time is set. The search extraction unit 22 extracts the relevant media information from the media information storage unit 21 based on the instruction of the management unit 24 and transfers it to the communication unit 23. The communication means 23 transmits the media information to the terminal which has made the delivery request (reference numeral 72 in FIG. 5).

FIG. 7 is a diagram showing an example of a transfer format for transferring media information. As shown in the figure, in addition to the media information body 43, the destination terminal ID 41 and the media information ID 4 are provided so that the terminal can uniquely identify the media information.
2 etc. are included. The terminal transfers the media information received by the communication device 33 to the recording means 34 and records it on a recording medium such as a CD.

FIG. 8 is a diagram showing the configuration of the terminal 12 having the media information storage device 37. Terminal 12 shown in FIG.
Differs from the terminal shown in FIG. 4 in that a search and extraction means 36 and a media information storage means 37 are added. The media information storage means 37 stores the media information sent from the center device via the communication means 33. The search and extraction means 36 searches the media information stored in the media information information storage means 37 for necessary media information. The buffer function of the recording unit 34 absorbs the speed difference between the media information storage unit 37 and the media information storage unit 37 when the media information is read and recorded in the storage medium. In the terminal 12 having the media information storage device 37, the media information expected to be requested by the user or the frequently used media information is acquired from the center device in advance and stored in the media information storage means 37, and the user information from the user is stored. Upon receiving a request, the media information storage means 37 is immediately read and the recording means 3 is read.
4 and can be stored in a storage medium. Also,
When there is no corresponding media information in the media information accumulating means 37 at the request from the user, the media information accumulating means is requested via the communication line to the center device and the media information acquired through the communication line is accumulated. The media information is stored in the storage unit 37, and the media information obtained via the communication line is transferred to the recording unit 34 and stored in the storage medium. Therefore, in the case of the terminal 12 having the media information storage means 37, it is not necessary to transfer frequently used media information or the like from the center device each time. Therefore, the communication cost can be reduced, and the responsiveness that the request from the user can be immediately answered can be improved.

FIG. 9 is a diagram showing the configuration of a center device according to another embodiment. The center device shown in the figure is different from the center device shown in FIG. 2 in that an encryption means 26 and a key generation means 27 are added. According to the configuration of the center device shown in FIG. 9, when the media information is transferred to the terminal, the media information is encrypted by the encryption means 26 by the encryption key generated by the key generation means 27 and sent to the communication line. As a result, there is an advantage that it is possible to protect against the leakage of information on the communication line.

FIG. 10 is a diagram showing the structure of a terminal corresponding to the center device shown in FIG. The terminal shown in the figure differs from the terminal shown in FIG. 8 in that a decoding means 39 is added. The media information encrypted and sent from the center device shown in FIG.
Will be stored as encrypted. The media information accumulated in the media information accumulating and accumulating means 37 is returned to the media information before being encrypted by the decrypting means 39, and then transferred to the recording means 34 and recorded in the storage medium. Further, when recording the media information already accumulated in the media information accumulating means 37, the corresponding media information is read by the search / extracting means 36, transferred to the decrypting means 39 and restored to the media information before being encrypted. After that, it is transferred to the recording means 34 and recorded in the storage medium. The decryption of the media information by the decryption means 39 may be performed by a method in which the decryption key is transferred from the center device, a method in which the information related to the generation of the encryption key in the center device is obtained, and the decryption key is generated by the terminal.

FIG. 11 is a diagram showing another example of the media information management table of the terminal. In the above-described embodiment, the delivery request or the record information is transferred to the center device each time when the data is recorded in the storage medium by the terminal. May be transmitted from the terminal to the center device. Further, instead of the request from the center device, the terminal side may transmit the record information at a predetermined time or a predetermined time interval. The media information management table shown in FIG. 11 is similar to the media information management table of the center device shown in FIG. In the case of music information, the media information ID shown in the figure uses a worldwide common code such as an international recording code (ISRC). In the media information management table shown in FIG. 11, a title 52 of media information for each media information ID, a storage position (address) 55 of the media information in the media information storage means 37, and a block size 56 indicating the size of the stored data. , Latest recording date and time 5
8, the presence / absence of accumulation 59, the number of recording times 60, etc. are recorded. In this way, the number of times of recording media information and the latest recording date and time are managed for each terminal, and this management information is reported to the center device in a lump. As a result, the processing load on the center device side can be reduced as compared with the case where delivery information is managed each time. In addition, communication exchanges with the center device can be reduced, and communication cost can be reduced.

FIG. 12 is a diagram showing an example of a terminal supervisory signal format. The signal shown in the figure is used to determine whether or not the terminal is an authorized terminal on the assumption that the center device transmits the media information to the terminal. Whether the terminal is a legitimate terminal or not is determined as follows. For example, as shown in FIG. 12A, the TID for identifying the terminal
And a signal including an inquiry signal having a specific pattern is transmitted from the center device to the terminal, and the center device waits for a response from the terminal. If it is a legitimate terminal, for example, FIG.
As shown in (b), the arrangement is such that a signal including a TID for identifying the terminal, a response signal having a specific pattern, and a status signal indicating the state of the terminal is returned. If the terminal is not a legitimate terminal, reject delivery of the requested media information. Only a legitimate terminal cannot know such a signal format and a signal generation method, and a terminal that attempts to obtain illegal information can be easily excluded. As a concrete method of creating an inquiry signal and a response signal, a method of comparing an input and an output of the same secret function as an inquiry signal between the center device and the terminal as a response signal, and a method of encryption by a cryptographic function There are several possible mechanisms, such as a method of combining the inquiry signal with the date and time and a random number to generate a different response signal each time. Further, it is conceivable that such a terminal monitoring signal format is exchanged periodically, for example, once a day at 12:00 am or every hour. By performing the periodical operation in this way, it is possible to further reduce the communication between the center device and the terminal and simplify the processing. Further, such exchange of the terminal monitoring signal may be performed as a pre-process each time there is a delivery request of the media information from the terminal to the center device. In this case, an unauthorized terminal can be more reliably excluded as compared with the case where terminal monitoring signals are exchanged regularly.

[0034]

As described above, according to the present invention,
The copyright can be surely protected. Further, it is possible to reduce the processing load on the center device side, reduce the communication cost, and speed up the provision of media information. Furthermore, it is possible to prevent illegal recording of media information.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a media information delivery system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a center device shown in FIG.

FIG. 3 is a diagram showing an example of a media information management table shown in FIG.

FIG. 4 is a diagram showing a configuration of a terminal that does not have a storage unit shown in FIG.

FIG. 5 is a diagram showing an information delivery procedure between a terminal and a center device according to an embodiment of the present invention.

FIG. 6 is a diagram showing an example of a format of a media information delivery request according to an embodiment of the present invention.

FIG. 7 is a diagram showing an example of a transfer format of media information according to an embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a terminal having a storage unit shown in FIG.

FIG. 9 is a diagram showing a configuration of a center device according to another embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a terminal according to another embodiment of the present invention.

FIG. 11 is a diagram showing an example of a media information management table of a terminal according to another embodiment of the present invention.

FIG. 12 is a diagram showing an example of a terminal supervisory signal format according to another embodiment of the present invention.

[Explanation of Codes] 10 ... Center Device, 13 ... Communication Line, 11, 12 ... Terminal, 21 ... Media Information Storage Means, 22 ... Search and Extraction Means, 23 ... Communication Means, 24 ... Management Means, 25 ... Media Information Management Table , 31 ... Management means, 32 ... Media information management table, 33 ... Communication means, 34 ... Recording means, 3
5 ... Selection information input means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Aki Yahata, Inventor Akiki Yahata, 1-chome, 3-chome, Asahigaoka, Hino-shi, Tokyo Inside the Toshiba Hino Plant (72) Inventor Ikuro Koyanazu 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Yoshiyoshi Yamanaka 1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Mitsuhiro Inagaki 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo No. Japan Telegraph and Telephone Corporation

Claims (5)

[Claims] 1. A media information delivery system for delivering media information from a center device to a terminal, wherein the center device has a storage means for storing the media information, and a first means for receiving a media information delivery request from the terminal. A receiving unit, a searching unit for searching the storage unit for media information corresponding to the delivery request received by the first receiving unit; and a first unit for transmitting the media information searched by the searching unit to the terminal. A transmission means and at least a management means for managing delivery information relating to the media information transmitted by the first transmission means, wherein the terminal selects the media information for which delivery is requested, and the selection means. Second transmission means for transmitting a delivery request of the generated media information to the center device, and transmission from the center device Second reception means and media information delivery system characterized by comprising a recording means for recording medium information received by the second receiving means in a storage medium for receiving media information. 2. A media information delivery system for delivering media information from a center device to a terminal, wherein the center device receives first media storage means for accumulating the media information, and a media information delivery request from the terminal. First receiving means, searching means for searching the first storing means for media information corresponding to the delivery request received by the first receiving means, and the media information searched by the searching means for the terminal A first transmitting means for transmitting to the first transmitting means and at least a managing means for managing delivery information relating to the media information transmitted by the first transmitting means, and the terminal selecting means for selecting the media information to be delivered. A second transmission means for transmitting a delivery request for the media information selected by the selection means to the center device; Second receiving means for receiving the media information transmitted from the storage device, second storage means for storing the media information received by the second receiving means, and media received by the second receiving means. A media information delivery system, comprising: recording means for recording information or media information accumulated by the second accumulating means on a storage medium. 3. A media information delivery system for delivering media information from a center device to a terminal, wherein the center device has a storage means for storing the media information, and a first means for receiving a media information delivery request from the terminal. Receiving means, searching means for searching the storage means for media information corresponding to the delivery request received by the first receiving means, and encryption means for encrypting the media information searched by the searching means, A first transmission means for transmitting the media information encrypted by the encryption means to the terminal; and a management means for managing delivery information related to the media information transmitted by at least the first transmission means, The terminal selects the media information requested to be delivered, and the delivery of the media information selected by this selection means. Second transmitting means for transmitting the request to the center device, second receiving means for receiving the media information transmitted from the center device, and decoding the media information received by the second receiving means. A media information delivery system comprising: a decryption means and a recording means for recording the media information decrypted by the decryption means in a storage medium. 4. A media information delivery system for delivering media information from a center device to a terminal, wherein the center device receives first media storage means for accumulating the media information, and a media information delivery request from the terminal. First receiving means, searching means for searching the first storing means for media information corresponding to the delivery request received by the first receiving means, and the media information searched by the searching means for the terminal And a second receiving means for receiving the delivery information transmitted from the terminal, the terminal selecting means for selecting the media information for which delivery is requested, and the selecting means. Second transmitting means for transmitting a delivery request of the selected media information to the center device, and receiving the media information transmitted from the center device Third receiving means, a recording means for recording the media information received by the third receiving means in a storage medium, and a delivery request by the second transmitting means or delivery information related to recording by the recording means. A media information delivery system comprising: a second storage unit for storing the delivery information; and a third transmission unit for transmitting the delivery information stored by the second storage unit to the center device. 5. A media information delivery system for delivering media information from a center device to a terminal, the center device storing means for storing the media information, and an inquiry signal for inquiring of the terminal whether the terminal is a legitimate terminal or not. First transmitting means for transmitting, first receiving means for receiving a response signal from the terminal, and based on the response signal received by the first receiving means, it is determined whether or not the terminal is an authorized terminal. Discriminating means, second receiving means for receiving a media information delivery request from the terminal, and searching means for searching the accumulating means for media information according to the delivery request received by the second receiving means. A second transmitting means for transmitting the media information searched by the searching means only to the terminal which is discriminated as an authorized terminal by the discriminating means, Selecting means for selecting the media information requested to be delivered by the terminal, third transmitting means for transmitting a delivery request for the media information selected by the selecting means to the center device, and media transmitted from the center device Third receiving means for receiving information, recording means for recording the media information received by the third receiving means in a storage medium, and fourth receiving means for receiving an inquiry signal transmitted from the center device. And a fourth transmitting means for transmitting a predetermined response signal when the inquiry signal is received by the fourth receiving means.