KR100970638B1 - Method for servicing message in multi unit digital satellite broadcasting receiver - Google Patents

Abstract

The present invention tunes multiple channels simultaneously through one main unit, and not only the main unit but each sub unit in a plurality of independent spaces receives a program of a specific channel tuned in the main unit to perform decoding and display. By installing a storage medium such as an HDD in the main unit and allowing the digital broadcasting receiver to share the HDD in the main unit and the sub unit, the HDD can be used to exchange messages between units or between actual users. They can effectively communicate what they want to leave when they are not at home at the same time, or when they do not have the opportunity to communicate with each other.

Main unit, N subunits, HDD, message service

Description

Method for servicing message in multi unit digital satellite broadcasting receiver

1 is a conceptual block diagram of a digital satellite broadcast receiver according to the present invention;

Figure 2 is a detailed block diagram of the main unit of Figure 1

3A and 3B illustrate an example of a message creation menu item and a message creation screen according to the present invention.

4 is a flowchart showing an example of a message service method according to the present invention.

5A is a diagram of the present invention showing an example of message information stored in the HDD.

Fig. 5B is a diagram of the present invention showing an example of a message list of a specific unit retrieved from the HDD.

5C is a diagram illustrating an example of a message content confirmation screen according to the present invention;

Explanation of symbols for main parts of the drawings

101: satellite antenna 102: LNB

103: multi-switching unit 110: main unit

200: CPU 210: multi tuner unit

220: multi-channel TP distribution unit 230: A / V decoder

240: modem 250: CAS unit                 

260: encryption engine 270: EPG DB

280: main transceiver 290: HDD

The present invention simultaneously tunes multiple channels through a main unit having a storage medium and a multi tuner, and simultaneously tunes different channels tuned in the main unit in each of the sub units and the main unit installed in a plurality of independent spaces. The present invention relates to a digital satellite broadcasting receiver that enables viewing, and in particular, a message service method in a digital satellite broadcasting receiver that allows a user to send and receive messages between units using a storage medium installed in a main unit of the digital satellite broadcasting receiver. It is about.

In general, digital satellite broadcasting has spread rapidly to Europe, Japan, Asia, and Africa since the world's first DirecTV in 1994, and can be viewed anywhere in the world. Digital satellite broadcasting is a method of compressing video / audio / additional data and transmitting digitally through satellites in MPEG 2 standard, and is related to a wide coverage area and region which are inherent to satellites compared to other transmission media. Due to the lack of equal broadcasting quality, economics of establishing a satellite broadcasting network, and simplicity of satellite channels, it is mainly led by pay broadcasting companies.

In addition, the receiver that can receive the digital satellite broadcast employs a CAS (Conditional Access System) that restricts the reception so that only subscribers can receive in pay broadcasting.

The CAS receives a TV program and a data service signal scrambled by a transmitting station in a receiver for pay per channel (PPC) or pay per view (PPV) other than the free and basic channel of satellite broadcasting. It is a system for managing authorized subscribers to receive service by descrambling using a smart card. Here, the PPC is a service that collects a predetermined fee for receiving a channel and is able to receive a broadcast, and the PPV is a service that calculates and charges a fee per program as a reception time. To this end, the CAS operator issues a smart card to the subscriber. The smart card is also referred to as a CAM (Conditional Access Module).

The smart card stores, for example, channel information that a user can view in the memory portion in the case of a pay channel, and usage information in the case of a PPV.

The PPV service allows a user to purchase a movie or sporting event in advance, for example. That is, the user may purchase a paid viewing program through the smart card.

Therefore, it is possible to extract the information stored in the smart card at the request of the limited reception system operator or the receiver. Also, the smart card has a decryption function that can descramble the scrambled signal. Provide the required key.

The digital satellite broadcast includes not only a program but also a program guide information. The program guide information is called APG (Advanced Program Guide) in digital satellite broadcasting such as DirecTV, and EPG (Electronic Program Guide) in digital terrestrial broadcasting. The program guide information is additional data information that allows the viewer to more conveniently use the TV to watch TV, and the viewer can obtain information about the current broadcast program and the future broadcast program directly on the screen without a newspaper or other guide medium. .

On the other hand, as people's income levels rise and their lives get better, nowadays, it is common to have more than one television in a household.

However, conventionally, in order to receive digital satellite broadcasts of a plurality of televisions in a home, a satellite broadcast receiver (Integrated Receiver &Decoder; IRD) must be installed for each TV and a smart card is issued, thereby increasing the user burden including subscription fee. . That is, a smart card is issued with one smart card per IRD to limit illegal viewing of non-subscribers.

In addition, when a user purchases a pay-per-view program such as a movie or a sports event through a two-way communication with a satellite broadcasting service provider, a modem is required. In the conventional case, a modem is installed for each IRD. There was this.

Therefore, in order to solve this problem, the applicant has a display device, a storage medium (for example, an HDD), a CAS unit, and a modem, and installs a main unit capable of simultaneously tuning multi-channels at a specific location in the home. The sub unit, which is installed in a plurality of independent spaces and has a display device, receives a specific channel tuned from the main unit, performs decoding and display, and records the necessary program by sharing the storage medium with the main unit. It has applied for a digital satellite broadcasting receiver (application number: 2003-39214, filing date: 2003.06.17; hereinafter referred to as '39214') to enable.

In the 39214, the HDD is installed only in the main unit, and the main unit and each sub unit share the HDD so that scheduled recording or real time recording can be performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a message service method in a digital satellite broadcast receiver that allows a message to be exchanged between units using a storage medium (HDD) installed in a main unit of a digital satellite broadcast receiver such as '39214' described above. Is in.

Another object of the present invention is to provide a message service method in a digital satellite broadcast receiver that allows a user to send and receive messages using a storage medium (HDD) installed in a main unit of a digital satellite broadcast receiver such as '39214'. In providing.

A message service method in a digital satellite broadcasting receiver according to the present invention for achieving the above object includes a HDD, a display device, a CAS unit in which unit ID and password are registered, and a modem and receive a plurality of channels. After tuning at the same time, the main unit which demodulates, descrambles, and re-encrypts the program of the tuned channel, and outputs it after encrypting it again. A message service method in a digital satellite broadcasting receiver comprising a plurality of sub-units received from the main unit, decoded, decoded and displayed, and sharing the HDD with the main unit, the method comprising: (a) a main unit or a plurality of sub-units; User composes message in subunit of any unit After selecting the item, using the input device to input the message sending unit identifier, the receiving unit identifier and the message content, the sub-unit transmits the message information to the main unit, (b) the message information in the main unit Stores the message in the HDD and inputs a message confirmation request, retrieves only the message information having the identifier of the unit requesting the message confirmation from the HDD and outputs the message information to the corresponding unit; and (c) displaying the message information in the corresponding unit. Characterized in that comprises the step of outputting to.

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In the step (b), if the main unit or the sub unit receives user authentication with the ID and password of the corresponding unit, a message confirmation request is automatically output to the main unit together with the identifier of the authenticated unit.

In the step (b), when the message confirmation item of the menu screen is selected in the main unit or the sub unit, a message confirmation request is output to the main unit together with the identifier of the unit.

The step (c) may include displaying a message list of the message information, and displaying contents of a message list selected from the message list.

Message service method in a digital satellite broadcast receiver according to another embodiment of the present invention,

(a) After a user selects a message composing item in one of the main unit or a plurality of subunits, a message sender, a recipient, and a message content are input by using an input device, and the subunit is the message information. Transmitting to the main unit;

(b) in the main unit, storing the message information in the HDD, and when a message confirmation request is input, retrieving only message information having a user identifier requesting message confirmation from the HDD and outputting the message to the unit requesting the message confirmation; And

(c) the unit comprises outputting the message information to a display device.

In the step (b), when a user is authenticated with a real user ID and password in the main unit or sub unit, a message confirmation request is automatically output to the main unit together with the authenticated user identifier.

In the step (b), when a user selects a message confirmation item on a menu screen and inputs a user identifier to search for, the message confirmation request is output to the main unit together with the user identifier. .

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

1 is a conceptual block diagram of a digital satellite broadcasting receiver disclosed in '39214', wherein an antenna 101 capable of receiving a digital satellite broadcast in a high frequency band and a satellite in a high frequency band received through the antenna 101 are shown in FIG. A low noise amplifier (LNB) 102 for low noise amplifying a signal, a multi-switching unit 103 for dividing a plurality of satellite signals output from the LNB 102 through each path, and a storage medium HDD is mounted, and the multi-switching unit 103 receives a plurality of satellite signals output through each path, and tunes and demodulates each channel to a channel required by each sub-unit through a multi tuner to form a transport stream (TP). After conversion to the main unit or the sub-unit of the plurality of sub-units stored in the HDD, or the demodulated TP signal or the TP signal stored in the HDD It is installed in a main unit 110 and a separate space, each of which is rammed and outputted to each sub unit, and requests channel selection or purchase information from the main unit, or requests recording and playback of a specific program from an HDD mounted in the main unit. It is composed of a plurality of sub-units (121, 122, ...) that receives the stream of a specific channel descrambled from the main unit 110, A / V decoded and displayed.

2 is a detailed block diagram of the main unit 110, the multi-tuner unit 210 is composed of a plurality of tuners and demodulators (211 ~ 21n), which is output through each path from the multi-switching unit 103 A satellite broadcast signal is received and simultaneously tuned to a channel required by a main unit or a plurality of subunits, demodulated, and output in a TP form.

The CAS unit 250 performs user authentication and descrambling of the main unit and each subunit using the integrated smart card.

At this time, the main unit is equipped with an HDD 290, in the main unit and / or each sub unit, the user can select at least one or more of the recording / playback / display of the currently received broadcast program by reservation or real time. According to the selected value, the multi-channel TP distribution unit 220 outputs and stores the TP stream corresponding to the recording of the TP streams output from the multi-tuner unit 210 to the hard disk 290 and corresponds to the display. The TP stream is output to the CAS unit 250 to perform descrambling, and then distributed to transmit the descrambled stream signal to the TV connected to the main unit and each sub unit. In addition, when the TP stream corresponding to the reproduction is read from the HDD 290, the TP stream is output to the CAS unit 250 to perform descrambling, and then the descrambled stream signal is output to the unit requesting reproduction. The central processing unit (CPU) 200 controls the overall operation of the main unit according to the request of the main unit and each subunit, and also controls the main unit and the satellite broadcasting service provider and the main unit and each subunit. It controls data communication and controls program recording and playback to the HDD 290. In addition, the A / V decoder 230 receives a stream of the main unit, which is descrambled and output from the multi-channel TP distribution unit 220 under the control of the CPU 200, and separates the stream into an audio and video stream. The decoded audio stream and the video stream respectively by a corresponding decoding algorithm and output to a display device (ie, a TV) connected to the main unit 110 for display.

The encryption engine 260 receives the stream of each subunit descrambled by the multi-channel TP distribution unit 220 under the control of the CPU 200 and performs encryption using a predetermined encryption algorithm. The main transceiver 270 transmits the stream encrypted by the encryption engine 260 to each sub unit, or receives recording information, user authentication information, channel selection information, and purchase information transmitted from each sub unit. Output to the CPU 200. The modem 240 is installed only in the main unit 110 and receives user authentication and purchase information transmitted from each sub unit through the CPU 200 and transmits the received information to the satellite broadcasting service provider, and transmits the related information from the satellite broadcasting service provider. It receives and outputs to the CPU (200).

Each sub unit is a sub IRD (Integrated Receiver & Decoder) that receives an encrypted stream signal transmitted from the main unit 110, decrypts it with a predetermined decryption algorithm, and restores the original digital video and audio signal. A display device (e.g., a TV) for displaying the video signal is connected and does not have a satellite tuner, modem, HDD and CAS.                     

Here, the main unit 110 and each sub unit 121, 122, ... may be connected by wire or wirelessly. When the main unit and each sub unit are wirelessly connected, there is no need for a cable between the main unit and each sub unit, which makes it easy to install, move, and add each sub unit.

Like the modem, the CAS unit 250 is also installed in the main unit 110 without being installed in each sub unit, and the smart card inserted into the CAS unit 250 is a family smart card. In this case, the satellite broadcasting service provider may provide a subscriber service such as discounting the subscription fee according to the number of sub units controlled by the main unit.

The smart card manages information related to user registration, authentication, and billing through data communication between the main and sub units and the satellite broadcasting service provider, and stores a decryption key for descrambling scrambled data. .

In addition, only one ID and password may be registered in the smart card, or an ID and password may be registered for each main unit and each subunit.

For example, when only one ID and password are registered in the smart card, the main unit and the main unit may be authenticated by inputting the ID and password registered in the smart card only in the main unit. All subunits connected to the unit can be logged on normally. As another example, in the main unit and any sub unit, the user ID may be input by entering the ID and password registered in the smart card, and when the user is authenticated, the main unit and all sub units may be normally logged on.

If an ID and password are registered for each main unit and each subunit in the integrated smart card, the corresponding subunit may receive user authentication through the main unit after inputting its ID and password. In this case, security can be kept secure for each subunit.

For example, assuming that IDs and passwords are registered for each main unit and subunit in the smart card, the ID and password inputted by the user in subunit B are transmitted to the main unit, and the main unit is transferred from the smart card of the CAS unit. The ID and password of the sub unit B are read, and if the ID and password transmitted from the sub unit B are compared and matched, the sub unit B transmits a signal indicating that user authentication has been performed. Then, the sub unit B is logged on and can be used normally.

At this time, the ID and password of the main unit can be assigned a master function to receive the user authentication in any sub-unit as well as the main unit, for example, can be used by the parent. That is, the ID and password of a sub unit may receive user authentication only in the corresponding sub unit, but the ID and password of the main unit may receive user authentication in all sub units as well as the main unit.

In addition, the smart card may store the ID and password for each actual user. In this case, when the user inputs his user ID and password in any unit and authenticates the user, the user can receive a broadcast set for him. Also at this time, the main user ID and password can be designated, and the master function described above can be given to this ID and password.

In this case, the HDD 290 is installed in the main unit, and the main unit and each sub unit may share the HDD 290 to perform reservation recording or real-time recording.

According to the present invention, a message is written in the main unit or each sub unit and stored in the HDD, so that the message can be left to another unit or another user.

If a message is created in the sub unit, the created message information is transmitted to the main unit and stored in the HDD. Similarly, when the sub-unit requests message confirmation, the sub-unit is transmitted to the main unit, and the main unit retrieves the message information requested by the sub-unit from the HDD and transmits the message information back to the sub-unit.

3 is a diagram illustrating an example of a menu for composing a message in a main unit or one sub-unit according to the present invention. That is, a user displays a menu screen as shown in FIG. 3A by using an input device (eg, a remote controller) in one of the main units or a plurality of subunits, and creates a message item among menu items of the menu screen. If is selected, the message creation screen shown in Fig. 3B is displayed on the display device of the unit.

In the message creation screen of FIG. 3B, the unit selection item is an item for selecting a unit for sending a message and a receiving unit, and a unit identifier for distinguishing each unit is displayed. The unit identifier may be set by the user or may be automatically set by the system as an ID of the corresponding unit.                     

In the message composition screen, the user may select a unit for sending a message and a unit for receiving the message. At this time, if the unit to compose the message is authenticated with the corresponding unit ID and password, the identifier of the authenticated unit may be automatically displayed in the unit selection item for sending the message.

In addition, the present invention may select the actual user to send a message and the actual user to receive the message on the message composition screen described above. Similarly, if the unit for composing the message is authenticated with the actual user ID and password, the authenticated user identifier may be automatically displayed in the message sending unit selection item.

At this time, the receiving unit or the user can select a plurality of messages. For example, when a parent wants to leave a message to two or more children, or wants to leave a message from a main unit to a plurality of subunits, a plurality of desired units and users may be selected in the message receiving unit selection item.

In addition, the unit and the user may select at the same time or select one of the message sending unit selection item and the message receiving unit selection item. That is, if the ID and password are registered for each unit in the smart card, only the unit identifier can be selected from the unit for sending a message and the unit selection item for receiving the message. If the ID and password are registered for each user in the smart card, the unit for sending a message is selected. Only the user identifier can be selected from the item and the receiving unit selection item.If ID and password are registered for each unit and user in the smart card, both the unit identifier and the user identifier can be selected from the sending unit selection item and the receiving unit selection item. Can be.

Then, when the unit to send a message and the receiving unit are selected, the user may write a message to leave. In this case, an input device capable of inputting a message (eg, a keyboard) may be connected to the main unit and each sub unit by wired or wireless connection, or after displaying characters on the screen, the desired characters may be combined using a remote controller. You can also choose to compose a message.

The message creation and unit selection order may be interchanged.

When the message creation and unit selection are completed as above, select 'OK' on the message creation screen, or select 'Cancel' if you want to cancel the message creation.

In the message composition screen, 'OK' is selected, and if the unit which has written the message is the main unit, the message information is immediately stored in the HDD, and in the case of the sub unit, the message information is stored in the HDD through the main unit.

In this case, the message information stored in the HDD includes a message content, a sending unit (user), a receiving unit (user), a preparation time, and the like, and are stored in a table as shown in FIG. 5A.

Thereafter, the main unit or the sub unit can check the message by the unit identifier or the user identifier. That is, when the user displays the menu screen as shown in FIG. 3A in the main unit or one sub unit and selects the 'message check' item, the user receives an identifier of the unit or a user identifier. Then, only the message list having the input unit identifier or the user identifier is retrieved from the HDD and displayed on the screen. If the sub unit requests message confirmation, the request signal is transmitted to the main unit, and the main unit searches only the message list having the identifier of the sub unit from the HDD and transmits the message to the corresponding sub unit. Display on the display device.

In this case, the identifier input screen may be displayed by distinguishing the sending unit input item and the receiving unit input item. For example, if the user selects unit a in the sending unit input item and unit b in the receiving unit input item, only the message list among the messages stored on the HDD is unit a and the receiving unit is unit b. Display as shown in 5b. In addition, the displayed message list screen may display whether or not the message is confirmed and when the message is sent. If the message is confirmed, the initial confirmation time may also be displayed. In addition, one or more of the message list may be selected and deleted. Then, the message contents are deleted on the HDD. In this case, in the case of deleting the message, the message sent through the password input can be deleted only by the sending unit or the person, and the received message can be deleted only by the receiving unit or the person.

If any one of the displayed message list is selected, the message content is displayed as shown in FIG. 5C. At this time, the unit / user who sent the message and the time sent may be displayed.

In addition, if the sending unit is not selected or 'All' is selected on the identifier input screen, and the receiving unit selects unit b, the message list including the sending unit or the unit regardless of the sending unit or the user among the messages stored in the HDD is All are displayed. On the contrary, if the sending unit selects unit a and the receiving unit does not select or selects 'all' on the identifier input screen, all the message list sent from unit a regardless of the receiving unit or person among the messages stored in the HDD Is displayed.

In the present invention, when a user authenticates a user with a corresponding unit ID and password in one of a main unit or a subunit, a message list or actual message content sent to the unit is displayed on a display device of the unit, or a message is displayed. You can also tell that is there.

Similarly, when a user authenticates a user with a user ID and password in either the main unit or sub-unit, a message list or actual message content sent to the user is displayed on the display device of the unit, or a message is present. You can also inform.

The message arrival service described above is, for example, the main unit monitors itself and each subunit, and when user authentication is performed in at least one of the units, the HDD is searched and the corresponding message information is transmitted to the user authentication unit. Can be achieved.

In other words, when a message is sent and received as described above, a message is written, checked, or deleted in the main unit directly through the interface with the HDD, but a message is written, checked, or deleted in the subunit interface with the HDD through the main unit. do.

4 is a flowchart illustrating a message service process of the present invention. That is, when the user displays the menu screen as shown in FIG. 3A in the main unit or one sub unit and selects the 'message write' item, a message write screen as shown in FIG. 3B is displayed, and then a specific unit is displayed on the message write screen. Or write a message to be sent to the person, and select the sending unit (person) and the receiving unit (person) (step 401). At this time, the message information created in the sub unit is transmitted to the main unit (step 402), and the main unit stores itself or message information transmitted from the sub unit in the HDD (step 403). In this case, the message information stored in the HDD includes not only the content of the message but also a sending unit / person identifier, a receiving unit / person identifier, and a sending time.

Thereafter, it is checked whether a message confirmation request is input in the main unit or the sub unit unit (step 404). Here, the message checking method may be various. That is, when the main screen or the sub unit displays the menu screen of FIG. 3A and selects the 'message confirmation' item, the main unit determines that a message confirmation is requested. In addition, even when a user authentication using a unit ID and a password or a user authentication using a user ID and a password is performed in the main unit or subunit, the main unit may determine that message confirmation is requested. At this time, the unit or user selection for requesting message confirmation has been described above and thus will be omitted.

When the main unit determines that there is a message confirmation request, the main unit retrieves message information having a corresponding unit or user identifier that has requested message confirmation from the HDD and sends the message information to the corresponding unit.

For example, if a message confirmation request is input from the main unit (step 406), the main unit reads message information having the identifier of the main unit from the HDD and outputs the message information to the display device (step 407).

On the other hand, if a message confirmation request is input in the sub unit (step 405), the main unit reads message information having the identifier of the sub unit from the HDD and transmits it to the sub unit (step 408), and the sub unit transmits The message information is output to the display apparatus (step 409).

In this case, in step 407 or 408 described above, the main unit may read only message information in the unit item received by the identifier of the unit requesting the message confirmation from the HDD, or read only message information in the sent unit item from the HDD. . Alternatively, if the identifier of the unit is in at least one of a sent unit item and a received unit item, the message information may be read. This depends on the designer's program.

The message information displayed on the display unit of the sub unit or the main unit may be a message list or actual message content.

In addition, if an actual user requests message confirmation, the main unit reads message information having the user identifier from the HDD and transmits the message information to a unit for which the user has requested message confirmation.

Meanwhile, the present invention may allow all message information stored in the HDD to be searched if the main unit or sub-unit is authenticated with the ID and password of the main unit or main user.

Terms used in the present invention are terms taken in consideration of functions in the present invention, which may vary according to the intention or custom of those skilled in the art and the definition should be made based on the contents of the present invention. will be. In addition, in the present invention, since the present invention has been described through the preferred embodiment of the present invention, in view of the technical difficulty aspects of the present invention, a person having ordinary knowledge in the art can easily and other embodiments of the present invention. Since other modifications may be made, it is obvious that both the embodiments and the modifications used in the above description belong to the claims of the present invention.

As described above, according to the unit-by-unit recording / reproducing method of the digital satellite broadcasting receiver according to the present invention, a multi-channel is simultaneously tuned through one main unit, and each sub unit as well as the main unit is located in a plurality of independent spaces. The HDD in the digital broadcasting receiver which receives a program of a specific channel tuned in the main unit to perform decoding and display, installs a storage medium such as an HDD in the main unit, and shares the HDD in the main unit and the sub unit. By sending messages between units or between actual users, you can use it to share what you want to leave when your family is not at home or when you do not have the opportunity to communicate with each other. It can be delivered efficiently.                     

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (9)

HDD, display device, unit access ID and password registered, CAS (Conditional Access System) that performs user authentication and descrambling, and modem that transmits and receives information with satellite broadcasting service provider and simultaneously tunes multiple channels received After demodulating and descrambled the program of the tuned channel, and encrypting and outputting again, the CAS unit, the modem, and the HDD are not provided. A message service method in a digital satellite broadcasting receiver comprising a plurality of sub-units received from a main unit, decoded, decoded, and displayed. (a) After a user selects a message composing item among menu items of a menu screen in one of the main unit or one of a plurality of subunits, an input device receives a message indicating a unit identifier, a receiving unit identifier, and a message content. Inputting message information including a message, the sub unit transmitting the message information to a main unit; (b) in the main unit, storing the message information in the HDD, and when a message confirmation request is input, retrieving only the message information having the identifier of the unit requesting the message confirmation from the HDD and outputting the message information to the corresponding unit; And and (c) in the corresponding unit, outputting the retrieved message information to a display device. The method of claim 1, The method of claim 1, wherein the number of units receiving the message in step (a) is selectable. The method of claim 1, wherein step (b) In the digital satellite broadcasting receiver, when the main unit or sub unit receives user authentication through the CAS unit of the main unit using the ID and password of the unit, a message confirmation request is automatically output to the main unit together with the set identifier of the authenticated unit. Message service method. The method of claim 1, wherein step (b) When the message confirmation item of the menu screen is selected in the main unit or sub unit, a message confirmation request is output to the main unit together with the identifier of the unit. The method of claim 4, wherein And if the message confirmation item is selected, receiving the unit identifier sending the message and the unit identifier receiving the message and transmitting the received unit identifier to the main unit. HDD, display device, unit access ID and password registered, CAS (Conditional Access System) that performs user authentication and descrambling, and modem that transmits and receives information with satellite broadcasting service provider and simultaneously tunes multiple channels received After demodulating and descrambled the program of the tuned channel, and encrypting and outputting again, the CAS unit, the modem, and the HDD are not provided. A message service method in a digital satellite broadcasting receiver comprising a plurality of sub-units received from a main unit, decoded, decoded, and displayed. (a) After a user selects a message composing item among menu items of a menu screen in one of the main unit or one of a plurality of subunits, an input device receives a message indicating a unit identifier, a receiving unit identifier, and a message content. Inputting message information including a message, the sub unit transmitting the message information to a main unit; (b) in the main unit, storing the message information in the HDD, and when a message confirmation request is input, retrieving only the message information having the identifier of the unit requesting the message confirmation from the HDD and outputting the message information to the corresponding unit; (c) displaying, at the unit, a list of the retrieved message information; And and (d) outputting the contents of the selected message information from the message information list to a display device. It includes a HDD, a display device, a CAS (Conditional Access System) unit which registers user ID and password for each user and performs user authentication and descrambling, and a modem for transmitting and receiving information with a satellite broadcasting service provider. After tuning at the same time, the main unit which demodulates, descrambles, and re-encrypts the program of the tuned channel, and outputs it after encrypting it again. In the message service method in a digital satellite broadcasting receiver comprising a plurality of sub-units received from the main unit to decode, decode and display (a) After a user selects a message composing item among menu items of a menu screen in any one of the main unit or a plurality of subunits, the user may include a message sender, a recipient, and a message content using an input device. Inputting message information, and the sub unit transmits the message information to the main unit; (b) in the main unit, storing the message information in the HDD, and when a message confirmation request is input, retrieving only message information having a user identifier requesting message confirmation from the HDD and outputting the message to the unit requesting the message confirmation; And and (c) in the corresponding unit, outputting the retrieved message information to a display device. 8. The method of claim 7, wherein step (b) When the user receives the user authentication through the CAS unit of the main unit with the actual user ID and password in the main unit or sub unit, a message confirmation request is automatically output to the main unit together with the set identifier of the authenticated user. Message service method in. 8. The method of claim 7, wherein step (b) When a user selects a message confirmation item on a menu screen and inputs a user identifier to search for in the main unit or sub unit, a message confirmation request is output to the main unit together with the user identifier. Service method.

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