JP3474761B2 - Mobile communication terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a mobile phone system.
Mobile phones such as mobile phones and PHS (Personal Handyphone System)
Related to communications systems, and distributes information such as e-mail
Communication terminal device used in a system having a function
About. [0002] 2. Description of the Related Art In recent years, mobile telephone systems, PHS, and the like have been migrated.
Mobile communication systems are rapidly spreading. And this kind of
In the system, in addition to the call service, news information etc.
Download service and mail information distribution service
The provision of various services has been started or considered. [0003] Among them, the mail information distribution service is an example.
For example, a wired terminal or mobile communication terminal connected to the public network
The e-mail information sent to the mobile communication terminal
Stored in a mail server provided on a remote computer, etc.
You. Then, the user of the mobile communication terminal device selects his / her own terminal.
By operating, it can be updated via wireless base station and public network.
Access the host computer to
File information is checked, and the mail information addressed to itself is stored.
Must be downloaded to the host computer.
Send a request to download the e-mail
Is configured to check the contents. [0004] SUMMARY OF THE INVENTION
In the conventional system with the mail delivery service function,
Whether there is mail information addressed to the host computer
Checking of information and downloading of information are always performed by mobile communication terminals.
Is executed in response to a user operation. This
Therefore, the terminal user forgets to check the mail information for a long time.
Confirmation operation cannot be performed due to
Email information can be checked over a long period of time
As a result, there were cases in which the communication work was hindered. The present invention has been made in view of the above circumstances.
Therefore, the purpose is to use mobile communication terminal equipment.
Information can be obtained without the user performing any information search operation.
So thathandUsers can send information to themselves from anywhere
So you can checkAnd check and obtain new information
Stable and reliable, with the permission of the user
And thisInformation transmission reliability and user operability
To provide mobile communication terminals with improved
You. [0006] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In addition, the present invention provides at least a predetermined wireless communication area.
And one base station via a radio channel.
And a base station connected via a communication network.
Mobile communication system with an information center device connected
A mobile communication terminal device used as the mobile station in the system.
Before accessing the information center device
An access that forms a communication link with the information center equipment
Information control means and the information control means.
With a communication link formed between the
The information center device checks whether there is any information addressed to itself.
Inquiry means to inquire, and this inquiry means
It is determined that there is more information addressed to itself, And more times
If the quality of the wire meets the requirements and
Condition that there is free space in the storage unit for saving
And users are not allowed to download information.
Is entered whenThe information center device
Request download of information addressed to you, and install the above information center
Information that receives information addressed to itself from the
Download control means, and information addressed to the self by a user.
Reads information addressed to itself from the storage unit in response to a search operation.
Information display control means for displaying
It is a sign. [0007] The access center to the information center device
For example, the power of the mobile communication terminal is turned on.
When the mobile communication terminal device is
It is preferable that the location registration executed when entering
You. [0008] Therefore, according to the present invention, the user can detect information.
If you do not need to search and download,
When the location of the communication terminal is registered, the information center
To confirm the information addressed to you and download the information.
Is performed. That is, confirmation of information addressed to the user and information
Will be downloaded automatically. Because of this, the user
Forgets the information search operation and leaves the base station wireless area
Or the quality of the wireless line is degraded and the information
Even if you cannot access theTerminal user
Will be automatically activated when communication becomes possibleInformation for yourself
The presence or absence and content of the information can be confirmed.Also information
The automatic download of
Only when there is a
Empty to satisfy the conditions of
Information down only when the storage capacity is
Loading is performed. As a result, the reliability of information transmission is improved
And if there is no prior permission from the user or if
Downloaded information despite lack of storage space
Can be prevented beforehand. The access control means may be an information center device.
Quality of the radio link with the base station prior to access
Is determined, and the quality of the wireless line satisfies a predetermined condition.
Access to the information center in case
I have. By doing so, you can confirm information addressed to yourself and
Download can be performed more accurately in a more stable state
Becomes In addition, the quality of the radio link between the
If certain conditions are not met, the quality of the wireless
Until the condition that satisfies the specified condition is satisfied,
The determination may be repeated at least once. this
Then, as long as the quality of the wireless line is restored,
Search and retrieve information addressed to itself without waiting for
Can be In general, the
Quality degradation may be temporary due to fading or other factors.
Many. Therefore, it is not necessary to retry
The probability that information can be obtained is high and extremely effective.
You. [0011] The present invention also provides the information display control means.
And read the information addressed to itself from the storage unit and display it
Later, it is determined whether access to the information center device is possible.
Judgment and, if possible, send information to the access control means.
It is also characterized by having access control to
ing. By doing so, the user can search for information.
You can check the information that has already been acquired when performing the operation
In addition, the latest information at the moment can be obtained from the information center equipment.
Can be obtained and displayed, thereby transmitting information.
Real-time property can be further improved. [0013] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A description will be given with reference to FIGS. FIG. 1 shows a mobile communication system according to the present invention.
1 shows a schematic configuration of a PHS which is an embodiment of the system.
You. In FIG. 1, a plurality of service areas are provided.
The base stations CS1 to CSm are distributed and arranged.
The radius is 100-500m depending on CS1-CSm, respectively.
Wireless areas Z1 to Zm called cell
It is. The base stations CS1 to CSm connect the PHS connection device PM
To digital public network INW consisting of ISDN
Connected respectively. The connection interface is I '
Interface is used. Mobile communication terminal device PS1 such as a portable information terminal
To PSn are radios formed by the base stations CS1 to CSm.
In the areas Z1 to Zm, the base station C via a radio channel
S1 to CSm and selectively connected to the base stations CS1 to CS1.
From CSm, the above ISDN or this ISDN and analog
Wired telephones TEL1 to TEL1 through a subscribed telephone network SNW
Connected to ELk. In addition, base stations CS1 to CSm
The mobile communication terminal devices PS1 to PS
Direct communication between n is also possible. The base stations CS1 to CSm and a mobile communication terminal
The wireless access method between the devices PS1 to PSn includes
Time Division Multiple Acc (TDMA)
ess) system, and time-division dual
Adopts TDD (Time Division Duplex) method
Have been. Also, the PHS has a host managed by a telecommunications carrier.
A strike computer HC is provided. This host co
Computer HC has a customer information management database,
The mobile communication terminals PS1 to PSn and the base station CS
Information relating to 1 to CSm is a public network INW and a packet network.
Collected via PNW, and based on this information,
Performs service management and control such as network management. The host computer HC has a
Server MS function. Mail server MS
Is an e-mail to the user sent from a wired terminal,
Service service center or other information provider.
Service information is stored, and the mobile communication terminal devices PS1 to PS1 are stored.
In response to a search request and download request from PSn,
Answer whether there is information to be distributed and download information
Do. Incidentally, the base stations CS1 to CSm are as follows.
It is configured as follows. FIG. 2 is a circuit block diagram showing the configuration.
FIG. The base stations CS1 to CSm are connected to an antenna 1
, A modem unit 2 and a TDMA unit 3
And an interface unit 4 and a control unit 5.
You. That is, the mobile communication terminals PS1 to PS
n is received by the antenna 11.
After that, through the high frequency switch (SW) 12 of the radio unit 1
Input to the receiving unit 13. In this receiving unit 13,
Received radio frequency signal from frequency synthesizer 14
Mixed with the generated local oscillation signal,
The frequency is converted to a frequency signal. Note that the above frequency synth
The local oscillation frequency generated by the sizer 14 is
Instructed by the control unit 5 according to the tunnel frequency. Also, nothing
The line unit 1 is provided with a reception field strength detection unit (RSSI) 16
Have been. The reception electric field strength detection unit 16
Of radio frequency signals arriving from the communication terminal devices PS1 to PSn
Received electric field strength is detected and the detected value is
Is notified to the control unit 5 for a search or the like. The reception intermediate frequency output from the reception unit 13
The wave signal is input to the demodulation unit 21 of the modem unit 2. demodulation
In the section 21, digital demodulation of the received intermediate frequency signal is performed.
That is, the digital communication signal is reproduced.
In the TDMA decoding unit 31 of the TDMA unit 3, the control unit 5
According to the instructions of each communication channel, ie time slot
The digital communication signal is separated for each
The digital call signal is input to the interface unit 4.
It is. The interface unit 4 has an adaptive differential PCM
Lance coder (ADPCM transcoder) 41
And a line interface unit 42. The above TDMA
The digital communication signal output from the decoding unit 31 is
First, the adaptive difference PCM transcoder 41
In other words, the public
Sent to network (ISDN) INW. On the other hand, a subscriber line is switched from the public network INW.
Digital call signals arriving via the
To the adaptive difference PCM transcoder 41 via the source 42
Is entered. And this adaptive difference PCM transcode
After being encoded by the
Is entered. In the TDMA encoding unit 32, the above adaptive
Each digit output from the differential PCM transcoder 41
Time signal corresponding to the desired radio channel
The multiplex is inserted into the lot and multiplexed.
The digital call signal is input to the modulator 22. Modulation section 22
In the above, the carrier signal is de-
Digitally modulated, and the modulated carrier signal is
5 is input. In the transmitting unit 15, the modulated carrier
Local signal generated by the frequency synthesizer 14
By mixing with the vibration signal, the control unit 5
The frequency is converted to the indicated radio channel frequency and
Is amplified to a predetermined transmission power level. And this transmission
The radio frequency signal output from the communication unit 15 is a high frequency switch.
From the antenna 11 to the mobile communication terminal via the antenna 12
Sent. The control unit 5 includes, for example, a microcomputer
The main control section has a
Mobile communication terminal device such as control function, radio channel control function, etc.
A function for connecting PS1 to PSn to the public network INW
Have. In addition, the base stations CS1 to CSm have
Local information such as road information, parking information, shopping information, etc.
Local information storage unit 50 for storing local information of
Has been obtained. The control unit 5 includes mobile communication terminal devices PS1 to PS1.
In response to a request from PSn, the local information storage unit 5
0 of the mobile communication end requesting the local information stored in
It also has a function to download to the device. On the other hand, the mobile communication terminals PS1 to PSn
It is configured as follows. FIG. 3 is a circuit block diagram showing the configuration.
FIG. The mobile communication terminals PS1 to PSn
Is a wireless unit 6 having an antenna 61, a modem unit 7,
It comprises a TDMA unit 8, a communication unit 9, and a control unit 10.
It is. That is, arrival from base stations CS1 to CSm
The received radio frequency signal is
The receiving unit 6 via the high frequency switch (SW) 62 of the line unit 6
3 is input. In this receiving unit 63, the received
Radio frequency signal generated from frequency synthesizer 64
The signal is mixed with the local oscillation signal and
Wave number conversion. The frequency synthesizer 64
The local oscillation frequency generated from the
Instructed by control unit 10 accordingly. The radio section 6 includes a reception field strength detection section.
(RSSI) 66 is provided. This received electric field strength
In the detecting unit 66, the non-
The received electric field strength of the line frequency signal is detected, and the detected value is controlled.
The control unit 10 is notified. The control unit 10 controls the RSSI
Based on the detected value, an empty channel when capturing a wireless channel
When performing a tunnel search, information search and download request
The quality of the wireless channel is determined. The receiving intermediate frequency output from the receiving section 63
The wave signal is input to the demodulation unit 71 of the modem unit 7. demodulation
In the section 71, digital demodulation of the received intermediate frequency signal is performed.
That is, the digital communication signal is reproduced. TDMA decoding section 81 of TDMA section 8
Is assigned to the own station according to the instruction of the control unit 10.
Wireless communication channel, i.e. time slot to digital
Extract the communication signal. And if you are on a call
Input the extracted digital call signal to the call section 9.
Power. The communication unit 9 is an adaptive difference PCM transcoder
(ADPCM transcoder) 91 and PCM codec
And the digital communication signal is
Differential PCM transcoder 91 and PCM codec
At 92, the signal is sequentially decoded and reproduced as an analog call signal.
The analog call signal is received by a receiver amplifier (not shown).
And amplified by the speaker 93. In response, download information is received.
In this case, the extracted digital data is
To enter. The control unit 10 controls the input digital
The data is stored in the information storage unit 100. On the other hand, the transmission input to the microphone 94
The audio is transmitted by the PCM codec 92 and the adaptive differential PCM
The digital communication signal is sequentially encoded by the lance coder 91.
No. In the TDMA encoding unit 82, the adaptive difference
Digital communication signal output from minute transcoder 91
Is the wireless communication channel designated by the control unit 10, and
And input to the modulation section 72.
It is. In the modulation section 72, the digital communication signal
The carrier signal is digitally modulated and the modulated carrier
The wave signal is input to the transmission unit 65. In the transmitting section 65, the modulated carrier signal
Signal generated by the frequency synthesizer 64
Signal from the control unit 10
Frequency is converted to the
It is amplified to a fixed transmission power level. And this transmitter
The radio frequency signal output from the high frequency switch 62
From antenna 61 to base stations CS1 to CSm via
Sent. The control unit 10 is, for example, a microcontroller.
Computer as the main control unit.
Normal controller such as wireless connection control function and call control function
Information retrieval / download control means 101
I have. This information retrieval / download control means 10
1 is the host computer when registering the location of the mobile communication terminal.
Automatically access the mail server MS of the computer HC
To check whether there is any information addressed to itself and download it. The control unit 10 includes an information storage unit 10
0, liquid crystal display (LCD) 102, key input unit 103 and
And a timer unit 104 are connected to each other. Information storage
The unit 100 includes a mail server M of the host computer HC.
Mail information downloaded from S, base station CS1
~ Store local information downloaded from CSm
Stack. Next, in the system configured as described above,
The information search and download operations in the embodiment will be described. FIG.
FIG. 4 is a diagram showing the operation sequence. In addition, FIG.
FIG. 6 shows the information in the mobile communication terminals PS1 to PSn.
Flow showing the procedure and contents of information search / download control
It is a chart. Now, for example, in the wireless area of the base station CS1
The power of the mobile communication terminal device PS2 is turned on or
The mobile communication terminal device PS2 moves from another wireless area to the base station.
It is assumed that the user has entered the wireless area of CS1. Then,
The mobile communication terminal PS2 needs to register its location with the base station CS1.
Request, and as a result, the mobile communication terminal PS2 and the registration destination
Location registration control is performed with the base station CS1. When the location registration is completed, the mobile communication terminal
PS2 proceeds to step 5b, where the received electric field strength
Based on the RSSI detection value detected by the detector 16,
Detect line quality. At this time, the quality of the wireless line is
Depending on the bit error rate (BER) of the received data,
Detect based on RSSI detection value and this BER
Is also good. Based on this detection result, the mobile communication terminal PS
2 is a step 5c where the quality of the wireless line satisfies a predetermined state
It is determined whether or not. And satisfy the prescribed quality
If not, the timer unit 104 is used in step 5d.
After monitoring the elapse of the predetermined time, return to step 5b.
To detect the quality of the wireless line again. Now, the quality of the radio line is
If the condition is satisfied, the mobile communication terminal PS2 proceeds to step 5
e, the user must search for information in advance.
It is determined whether or not the setting for requesting has been made. So
If the settings have been made, the host
Communication link with the mail server MS of the computer HC
Control to establish that the communication link is established
Then, an information search request is sent to the mail server MS.
If information search is not set, mobile communication
The terminal device PS2 shifts to the standby state as it is. The mail server MS sends the information search request
Upon receipt, the requesting mobile communication terminal PS2
After authentication, return information search response and search information
To start. At this time, the requesting mobile communication terminal device PS2
Waits for the return of the response in step 5h, and the response is returned.
Then, "information is being searched" is displayed on the LCD 102 in step 5i.
Show. Then, the search is completed in the mail server MS.
And as a result, a new
If it is found that there is information, the mail server MS
Notifies the mobile communication terminal PS2 of "new information available"
It is. If there is no new information,
No information "is notified. The mobile communication terminal device PS2 is
"New information available" notified from the mail server MS or
“No new information” is displayed on the LCD 102. And
In the case of "No new information", it is displayed after displaying for a certain period of time
Is terminated and the state shifts to a standby state. On the other hand, if "new information available" is notified,
The mobile communication terminal device PS2 downloads the information in step 6d.
It is determined whether or not the conditions of the mode are satisfied. Here
The conditions for downloading information are defined as the conditions under which the quality of
Is satisfied, and the free space of the information storage unit 100 is
Adequate, and user downloading information
Is input in advance. These conditions
Is satisfied, the mobile communication terminal device PS2
Proceed to step 6e to request an information download here.
Send out. If the conditions are not met,
Move to the standby state. The mail server MS sends a notification that there is new information.
Then, the information is downloaded from the mobile communication terminal PS2 within a predetermined time.
When a download request arrives, a response is returned and information is returned.
Start downloading. At this time, the mobile communication terminal
When the PS2 receives the above response, the "information download"
"Medium" is displayed, and it comes from the mail server MS.
Receiving download information. And this received
The download information is stored in the information storage unit 100. Then, the information download from the mail server M is performed.
When the card end notification arrives, at step 6g the mobile communication terminal
The terminal device PS2 downloads to the LCD 102 for a certain period of time.
"End" is displayed and download is performed in step 6h.
Send a password confirmation. Then, the cutting process is performed in step 6i.
Execute and shift to the standby state. In the above description, the host computer HC
From the mail server MS to the mobile communication terminal PS2
Although the case of downloading file information has been described,
Local information from the base station CS1 to the mobile communication terminal device PS2
Is downloaded in the same manner. Was
However, in this case, communication by the mobile communication terminal device PS2 is performed.
The connection destination of the link is the base station CS1, and the base station CS1
A communication link has been established with the mobile communication terminal device PS2
After that, the mobile communication terminal P
The information requested by S2 is read and downloaded. On the other hand, in the standby state, the mobile communication terminal
User of terminal device PS2 goes down by key input unit 103
When a browsing operation of the load information is performed, the control unit 10 first
Whether or not the information addressed to itself is stored in the storage unit 100
Judgment, and if it is memorized, "Email has arrived"
After displaying such a message, the received information is stored.
The data is read from the unit 100 and displayed on the LCD 102. this
Sometimes, the display information also shows the time of the incoming call, the source information, etc.
Is done. After the display of the received information, the "new arrival information"
Do you want to confirm? Is displayed, and this
When the user operates the yes key, the control unit 10
After confirming whether calling is possible, if possible
Call the host computer HC and check for new information
Make a request. And the new arrival information from the mail server MS
When notified of the existence, the fact is displayed on the LCD 102.
And then meet the information download conditions described above.
After confirming whether or not the user has downloaded
Download to mail server MS according to request transmission operation
Outgoing request. And information from the mail server MS
Is downloaded, the new information is stored in the information storage unit 1.
00 and the LCD 102
To display. Therefore, the user is not allowed to receive the previously received mail.
Mail information as well as the latest email information at the moment.
From the server MS. As described above, the mobile communication terminal of this embodiment
In the devices PS1 to PSn, when the position registration control is executed
In this regard, call the mail server MS to receive new mail
Inquiry about nothing, then download if there is new mail
Send out the request and download from the mail server MS
Received mail information and stores it in the information storage unit 100.
I am trying to. Therefore, the user can search and download information.
Even if you do not perform any mode operation, automatically
To check if there is any new information
The information is further downloaded and the information storage unit 10
0 is stored. Therefore, the user forgets the information search operation.
Is out of the wireless area of the base station.
The quality of the line has deteriorated and the mail server MS or base station C
Even if you cannot access S1 to CSm,
It is possible to check the presence and content of information addressed to yourself at the venue
Becomes In the present embodiment, the mail server MS
Prior to the access of the base station,
Judge the quality of the line and check that the quality of the wireless line
If you are satisfied, access the mail server MS
I am trying to do it. For this reason, check for new information
And more accurate and stable downloads
It becomes possible. Further, in this embodiment, the base stations CS1 to CS
The quality of the wireless line to Sm satisfies the prescribed conditions.
If not, the quality of the wireless line satisfies the prescribed conditions
Until the state is reached, the determination of the quality of the wireless channel is repeated.
For this reason, as long as the quality of the wireless line is restored,
Search and obtain information addressed to itself without waiting for location registration
Can be. Generally, the quality of the radio link in mobile communication systems
Degradation is often temporary due to the effects of fading, etc.
No. Therefore, it is necessary to retry the quality judgment of the wireless line.
The probability of obtaining information is high and extremely effective.
You. Further, in this embodiment, the user inputs a key.
When the browsing operation of the download information is performed by the unit 103,
First, information addressed to itself is stored in the information storage unit 100.
Judge whether or not the received information is stored.
The data is read from the unit 100 and displayed on the LCD 102. Soshi
After displaying the received information, the user
Enter confirmation request to confirm whether outgoing call is possible
After that, if possible, the host computer HC
Make a call and make a request to confirm new information, and if new information exists
Then, the information downloaded from the mail server MS
While being stored in the information storage unit 100,
It is displayed in real time. Therefore,
The user will not only receive the email information already received,
The latest mail information at the time is also obtained from the mail server MS.
Can be confirmed. The present invention is limited to the above embodiment.
Not something. For example, in the above embodiment, the carrier
Mail server M provided in host computer HC
S or information from the local information server provided in the base station.
In the example above, downloading information is explained.
Connected to the Internet via a public network, and
Information from websites and other information sources
It may be loaded and the Internet
Mail servers and content provided by service providers
May download information from the server
No. In the above embodiment, the information is registered when the location is registered.
Information search / download request.
Information search / download required after communication associated with call or incoming call
Request may be sent, and the timer
To periodically send information search and download requests
It may be. In addition, the type of mobile communication system and mobile communication
Of communication terminal device, information retrieval / download control procedure
And its contents do not depart from the gist of the present invention.
Various modifications can be made within the scope. [0059] As described in detail above, in the present invention,wireless
When the line quality meets the specified conditions,
There is free space for storage in the storage unit and
When permission to download information has been entered in advance
Only if the information is downloaded. For this reason,
User operability and information transfer for downloading information
Is more secure and without prior user approval
Even if there is no free space in the memory
The problem of unloading can be prevented beforehand. Therefore, according to the present invention, the information
Confirmation and download of information are performed automatically
As a result, the user of the mobile communication terminal device performs an information search operation.
You can get information without having to do any work,
So that the user can check the information addressed to him from anywhere.
To improve the reliability of information transmission and user operability.
Can be planned.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of a PHS as an embodiment of a mobile communication system according to the present invention. FIG. 2 is a circuit block diagram showing a configuration of a base station of the system shown in FIG. FIG. 3 is a circuit block diagram showing a configuration of a mobile communication terminal device of the system shown in FIG. FIG. 4 is a sequence diagram for explaining an information search / download operation in the system shown in FIG. 1; FIG. 5 is a flowchart showing a first half of an information search / download control procedure in the mobile communication terminal device shown in FIG. 3; 6 is a flowchart showing a latter half of an information search / download control procedure in the mobile communication terminal device shown in FIG. 3; [Description of Codes] CS1 to CSm Base stations Z1 to Zm Wireless zone INW Digital public network PM PHS connection device SNW Analog telephone network TEL1 to TELk Wired telephone PNW Packet network HC Host computer MS Mail Server 1 base station radio section 2 base station modem section 3 base station TDMA section 4 base station interface section 5 base station control section 6 mobile communication terminal apparatus radio section 7 mobile communication terminal Modem section 8 of the apparatus TDMA section 9 of the mobile communication terminal 9 Talk section 10 of the mobile communication terminal 10 Control section 11, 61 of the mobile communication terminal 11 Antenna 12, 62 High frequency switch (SW) 13, 63 Reception Units 14 and 64 Frequency synthesizers 15 and 65 Transmitters 16 and 66 Received field strength detectors (RSSIs) 21 and 71 Demodulators 22 and 72 Regulating portion 31 and 81 ... TDMA decoding unit 32, 82 ... TDMA encoding unit 41,91 ... adaptive differential PCM transcoder (ADPC
M transcoder) 42 line interface 50 base station local information storage unit 92 PCM codec 93 speaker 94 microphone 100 download information storage unit 101 information retrieval / download control unit 102 liquid crystal display (LCD) 103 ... Key input unit 104 ... Timer unit

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (1)

(57) [Claim 1] At least one base station constituting a predetermined wireless communication area, a mobile station connected to the base station via a wireless channel, and In a mobile communication system including an information center device connected via a communication network, a mobile communication terminal device used as the mobile station, wherein the information center device is accessed to communicate with the information center device. Access control means for forming a communication link to the information center device, and in the state where a communication link is formed between the information center device and the access control means, whether or not there is information addressed to the information center device. Inquiring means for inquiring, it is determined that the information addressed to the self exists, and the quality of the wireless line satisfies a predetermined condition.
And a storage unit for storing information addressed to itself
Satisfies the condition that there is free space, and
When permission to download the information is input in advance , the information center device requests the information center device to download the information addressed to itself , receives the information addressed to itself from the information center device, and stores the information in the storage unit. A mobile communication terminal comprising: an information download control unit; and an information display control unit that reads and displays the information addressed to the self from the storage unit in response to a search operation of the information addressed to the self by a user. .