JP2004125489A - Time correction system, and time correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a time correction system, and a time correction method preventing damage such as fraudulent access. <P>SOLUTION: A time managing device 2 is provided with a time information sending part 231 receiving a time signal including time information. A first time providing device 3 is provided with a clocking part 312, an extracting part 3151 extracting the time information from the time signal, a correcting part 3152 correcting time information of the clocking part 312 in response to the time information, and a network card 314 outputting the time signal including the time information. A second time providing device 4 is provided with a network card 411, an extracting part 4151 extracting the time information from the time signal, a correcting part 4152, and a wireless router 413 sending the time information. In information processors 5-1 to 5-n, the time information outputted from the second time information providing device 4 is received by the wireless router 413, and time information of a clocking part 501 is corrected on the basis of the time information. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a time correction system and a time correction method, for example.
[0002]
[Prior art]
With the rapid spread of communication networks, many computer devices such as personal computers are connected to communication lines.
Conventionally, a standard time supply system that supplies a standard time to a computer device connected to a communication line is known (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-281368 (page 1-4, FIG. 1)
[0004]
[Problems to be solved by the invention]
By the way, in recent years, damages such as unauthorized access to computer devices and erasure of important information due to computer viruses have frequently occurred through communication lines.
In the system that supplies the standard time described above, a system that prevents damage such as unauthorized access as described above is desired.
[0005]
The present invention has been made in view of such circumstances, and an object thereof is to provide a time correction system and a time correction method for preventing damage such as unauthorized access.
[0006]
[Means for Solving the Problems]
To achieve the above object, a time correction system according to a first aspect of the present invention provides a time management device that manages time information and a time provision that provides the time information to an information processing device that corrects internal time. A time correction system including a time information transmitting unit that transmits a time signal including the time information, and the time providing device includes a time measuring unit that measures time, An extraction unit that extracts only the time information from the time signal based on the time signal output from the time information transmission unit, and a time of the time measuring unit based on the time information extracted by the extraction unit Correction means for correcting information; and providing means for providing the time information to the information processing apparatus.
[0007]
According to the present invention, in the time management device, the time information transmission means transmits a time signal including time information.
In the time providing device, the time is measured by the time measuring means. The extracting means extracts only time information from the time signal based on the time signal output from the time information transmitting means.
The correcting means corrects the time information of the time measuring means based on the time information extracted by the extracting means.
The providing means provides time information to the information processing apparatus.
[0008]
In order to achieve the above object, a time correction system according to a second aspect of the present invention includes a time management device that manages time information, a first time providing device, and an information processing that corrects internal time. A time correction system having a second time providing device for providing the time information to a device, wherein the time management device has time information transmitting means for transmitting a time signal including the time information, A time providing device for measuring time, an extracting unit for extracting only the time information from the time signal based on the time signal output from the time information transmitting unit, and the extracting unit The second time providing unit includes a correcting unit that corrects the time information of the time measuring unit, and a transmitting unit that outputs the time information to a second time providing device based on the time information extracted by Dress Includes the first to receive the time information output from time providing apparatus, the time information providing means for providing the time information to the information processing apparatus.
[0009]
Furthermore, in order to achieve the object, a time correction method according to a third aspect of the present invention provides the time information to a time management device that manages time information and an information processing device that corrects internal time. A time correction method of a time correction system having a time providing device, wherein the time management device transmits a time signal including the time information, and the time providing device is based on the transmitted time signal. Only the time information is extracted from the time signal, the time information being timed is corrected based on the extracted time information, and the time information is provided to the information processing apparatus.
[0010]
Furthermore, in order to achieve the object, a time correction method according to a fourth aspect of the present invention includes a time management device that manages time information, a first time providing device, and an information processing that corrects internal time. A time correction method for a time correction system having a second time providing device for providing the time information to a device, wherein the time management device transmits a time signal including the time information, and the first time The providing device extracts only the time information from the time signal based on the transmitted time signal, corrects the time information being timed based on the extracted time information, and converts the time information to The second time providing apparatus outputs the time information output from the first time providing apparatus, and provides the time information to the information processing apparatus.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an overall view of an embodiment according to a time correction system of the present invention.
As shown in FIG. 1, the time correction system 1 according to the present embodiment includes a time management device 2, a first time providing device 3, and a second time providing device 4.
[0012]
For example, the time management device 2 is installed in the time management center TS. A second time providing device 4 is installed in the data center DS, and provides time information to a plurality of information processing devices 5-1 to 5-n, for example.
A first time providing device 3 is installed in a facility SS adjacent to the data center DS.
The first time providing device 3 and the second time providing device 4 are connected by, for example, a dedicated line, specifically, a wired system with high security.
[0013]
As shown in FIG. 1, for example, the time management device 2 includes a GPS (Global positioning systems) receiving circuit 21, a parent clock 22, and a primary NTP (Network time protocol) server 23.
[0014]
For example, the GPS receiving circuit 21 receives a time signal transmitted from the GPS satellite 201 via the antenna ANT and demodulates it, and outputs the time information included in the time signal to the parent clock 22. The GPS satellite 201 corresponds to the standard time providing apparatus according to the present invention.
[0015]
The master clock 22 measures the reference time and manages the time.
The master clock 22 performs correction processing based on the time information output from the GPS receiver circuit 21.
For example, the master clock 22 measures time based on a signal from rubidium atoms.
[0016]
The primary NTP server 23 supplies time information measured by the parent clock 22 via the communication network 61 to the request source.
The primary NTP server 23 outputs the time information measured by the parent clock 22 to the first time providing device 3 via the communication network 61.
The primary NTP server 23 supplies time information to the request source using a predetermined method, for example, a network time protocol (NTP).
[0017]
The first time providing device 3 receives the time information output from the time management device 2 and transmits it to the second time providing device 4.
The first time providing device 3 includes a secondary NTP server 31, a reference clock 32, and a router 33, for example, as shown in FIG.
[0018]
The secondary NTP server 31 receives the time information output from the primary NTP server 23 via the communication network 61, and corrects the internal timekeeping time.
The secondary NTP server 31 outputs a time signal including the time information to the data center DS via the router 33.
[0019]
The reference clock 32 measures a reference time.
For example, when a failure or the like of the communication network 61 occurs, the secondary NTP server 31 refers to the time information of the reference clock 32.
[0020]
The second time providing device 4 includes a time correction server 41 and a router 42.
The time correction server 41 receives a time signal including the time information output from the secondary NTP server 31 via the router 42, and corrects the time information measured internally.
The time correction server 41 supplies time information to the request source in response to a request from the information processing devices 5-1 to 5-n via the router 42.
For example, each of the time correction server 41 and the information processing devices 5-1 to 5-n is connected by a wireless LAN.
[0021]
FIG. 2 is a functional block diagram showing a specific example of the time correction system shown in FIG.
The time management device 2 includes a time information transmission unit 231 that transmits a time signal including time information.
For example, the primary NTP server 23 includes a time information transmission unit 231 that transmits a time signal including time information measured by the parent clock 22.
[0022]
The time management device 2 includes a time correction unit that receives a standard time signal provided from a GPS satellite 201 serving as a standard time providing device and corrects time information managed based on the standard time signal.
For example, the master clock 22 includes a time correction unit 221 that corrects time information managed based on the standard time signal received by the GPS receiving circuit 21.
[0023]
The secondary NTP server 31 of the first time providing device 3 includes, for example, a communication interface (Interface: I / F) 311, a timer unit 312, a memory 313, a network card 314, and a CPU 315, as shown in FIG. .
The communication interface 311, the timer unit 312, the memory 313, the network card 314, and the CPU 315 are connected by a bus BS.
[0024]
A communication I / F (Interface) 311 communicates with the primary NTP server 23 via the communication network 61.
For example, the communication interface 311 receives a time signal output from the primary NTP server 23 and outputs the time signal to the CPU 315.
[0025]
The timer unit 312 measures time. The clock unit 312 outputs time information to the time correction server 41 via the network card 314 and the router 33 under the management of the CPU 315.
[0026]
The memory 313 is managed by the CPU 315 and stores predetermined parameters, programs, and the like. The memory 313 is also used as a work space for processing by the CPU 315.
The memory 315 is a storage device such as a random access memory (RAM), a read only memory (ROM), or a hard disk drive (HDD).
[0027]
The network card 314 performs modulation processing based on the time information output from the CPU 315, converts the signal into a predetermined format signal, and outputs the signal to the second time providing device 4 via the router 33 and the communication line 63.
The network card 314 demodulates the time signal output from the second time providing device 4 and outputs it to the CPU 315.
[0028]
The CPU 315 performs processing related to time correction based on the data stored in the memory 313.
The CPU 315 includes, for example, an extraction unit 3151 and a correction unit 3152.
[0029]
Based on the time signal output from the communication interface 311, the extraction unit 3151 of the CPU 315 extracts only time information from the time signal.
[0030]
For example, a time signal including time information is output from the time management device 2 to the communication interface 311 via the communication network 61.
The extraction unit 3151 of the CPU 315 removes unnecessary information from the time signal received by the communication interface 311 and extracts only the time information.
[0031]
Unnecessary information is, for example, data related to unauthorized access, programs such as viruses and Trojan horses, and emails attached with them.
For example, the extraction unit 3151 of the CPU 315 stores unnecessary information removal information D_D for removing unnecessary information in the memory 313 in advance, and a time signal received by the communication interface 311 based on the unnecessary information removal information D_D. From this, unnecessary information is removed and only time information is extracted.
[0032]
For example, in detail, the extraction unit 3151 of the CPU 315 performs the above-described virus detection processing and removal processing, processing in the mail, mail archiving, and the like, removes unnecessary information, and extracts only time information.
The correcting unit 3152 of the CPU 315 corrects the time information of the time measuring unit based on the extracted time information.
[0033]
For example, when the communication state with the time management device is poor, the correction unit 3152 of the CPU 315 corrects the time measured by the time measuring unit 312 based on the time information timed by the reference clock 32, for example. When the communication state is good, the time information is output to the reference clock 32 at a predetermined timing, for example, several times a day, and the time information measured by the reference clock 32 is corrected.
[0034]
The CPU 315 transmits a time signal including the time information of the time measuring unit 312 to the second time providing device 4 via the network card 314 and the router 33 at a predetermined timing, for example, several times a day.
In response to a request for time information from the second time providing device 4, the CPU 315 provides a time signal including time information measured by the time measuring unit 312 via the network card 314 and the router 33. Provided to apparatus 4.
By doing so, the time information timed by the first time providing device 3 and the time information timed by the second time providing device 4 are always synchronized.
[0035]
As shown in FIG. 2, the time correction server 41 of the second time providing device 4 includes a network card 411, a timer unit 412, a wireless router 413, a memory 414, and a CPU 415.
The network card 411, the timer unit 412, the wireless router 413, the memory 414, and the CPU 415 are connected by a bus BS.
[0036]
The network card 411 performs predetermined data communication with the first time providing device 3 via the router 33, the communication line 63, and the router 42.
The communication line 63 is, for example, a dedicated line that connects the first time providing device 3 and the second time providing device 4.
[0037]
The timer unit 412 measures time. The time information timed by the time measuring unit 412 provides time information to the requesting information processing devices 5-1 to 5-n via the wireless router 413 in response to a request under the management of the CPU 415.
[0038]
As described above, the wireless router 413 receives the time information in response to the request via the wireless router 413 based on the time information measured by the time measuring unit 412 under the control of the CPU 415. Time information is provided to 5-1 to n.
[0039]
The memory 414 is managed by the CPU 415 and stores predetermined parameters, programs, and the like. The memory 414 is also used as a work space for the processing of the CPU 415.
For example, the memory 414 is a storage device such as a RAM, a ROM, or an HDD.
[0040]
The CPU 415 has the same function as the CPU 315 of the first time providing device, for example.
For example, the CPU 415 performs processing related to time correction based on data stored in the memory 414.
[0041]
For example, the CPU 415 includes an extraction unit 4151 and a correction unit 4152 in detail.
The extraction unit 4151 of the CPU 415 extracts only time information from the time signal based on the time signal output from the network card 411.
For example, a time signal including time information is output from the first time providing device 3 to the network card 411 via the communication line 63 and the router 42.
[0042]
The extraction unit 4151 of the CPU 415 removes unnecessary information from the time signal received by the network card 411 and extracts only the time information.
[0043]
For example, in detail, the extraction unit 4151 of the CPU 415 stores unnecessary information removal information D_D for removing unnecessary information in the memory 414 in advance, and is received by the network card 411 based on the unnecessary information removal information D_D. Only the time information is extracted from the time signal by removing unnecessary information.
[0044]
For example, in detail, the extraction unit 4151 of the CPU 415 performs the above-described virus detection processing and removal processing, processing in the mail, mail archiving, and the like, removes unnecessary information, and extracts only time information.
[0045]
The correction unit 4152 of the CPU 415 corrects the time information of the time measuring unit 412 based on the extracted time information.
The CPU 415 outputs a request for time information to the first time providing apparatus via the network card 411 at a predetermined timing, for example, several times a day, and is output from the first time providing apparatus 3 in response to the request. Based on the time information, the time information of the time measuring unit 412 is corrected.
[0046]
For example, when the CPU 415 receives a request for time information from the information processing devices 5-1 to 5-n via the wireless router 413, the time information measured by the time measuring unit 412 is sent to the information processing devices 5-1 to 5-n of the request source. The data is output via the wireless router 413.
The CPU 415 outputs the time information measured by the time measuring unit 412 at a predetermined timing, for example, several times a day, to the information processing devices 5-1 to 5-n via the wireless router 413.
[0047]
For example, the second time providing device 4 supplies time information to the information processing devices 5-1 to 5-n of the information processing system 50 provided in the data center DS.
For example, the information processing devices 5-1 to 5-n perform desired data processing in response to a request from the external terminal device 7, and transmit the processing result to the requesting terminal device 7.
[0048]
As shown in FIG. 1, for example, the information processing system 50 includes a storage 51, a fiber channel switch 52, a load distribution device 53, information processing devices 5-1 to 5 -n, switches (Switch) 54, and a firewall 55. .
[0049]
The storage 51 is a large-capacity storage device that stores predetermined information, for example. Information stored in the storage 51 via the fiber channel switch 52 is read out by the information processing devices 5-1 to 5 -n, and predetermined information is written therein.
[0050]
The fiber channel switch 52 switches the connection between the storage 51 and the information processing apparatuses 5-1 to 5 -n in response to a request.
The fiber channel switch 52 is connected to the information processing devices 5-1 to 5 -n by an optical fiber cable C, for example.
[0051]
As described above, the information processing devices 5-1 to 5-n receive the time information provided from the time correction server 41 of the second time providing device 4 and correct the internal time information.
For example, the information processing devices 5-1 to 5-n perform predetermined processing and provide predetermined information to the request source in response to a request from the terminal device 7 that is accessed via the communication network 62.
The information processing devices 5-1 to 5-n access the storage 51 via the fiber channel switch 52 to write and read predetermined information.
[0052]
The information processing devices 5-1 to 5-n include, for example, a wireless router 501, a timer unit 502, a memory (not shown), and a CPU.
The wireless router 501, the timer unit 502, the memory, and the CPU are connected by a bus BS (not shown).
[0053]
The CPU corrects the time information of the time measuring unit 502 based on the time information received via the wireless router 501.
The CPU requests time information from the second time providing device 4 via the wireless router at a predetermined timing, for example, several times a day, and the time output from the second time providing device 4 in response to the request. Based on the information, the time information of the time measuring unit 502 is corrected.
[0054]
The load distribution device 53 is a device for distributing traffic load, for example, and distributes and outputs the time signal from the terminal device 7 to each of the information processing devices 5-1 to n.
The load distribution device 53 outputs the time signal output from each of the information processing devices 5-1 to 5 to n to the switch 54.
[0055]
The switch 54 outputs the time signal output from the terminal device 7 to the load distribution device 53. The switch 54 outputs the time signal output from the load distribution device 53 to the firewall (F / W) 55. This switch 54 is used, for example, as a redundant configuration of the communication system.
[0056]
The firewall (F / W) 55 prevents, for example, unauthorized intrusion from the terminal device 7 outside the data center DS via the communication network 62 and permits only normal access.
[0057]
For example, the firewall 55 monitors ports that the information processing apparatuses 5-1 to 5 -n provide predetermined information and restricts unauthorized intrusion accessed from other ports.
The firewall 55 monitors a predetermined port and prevents important information from leaking from the information processing devices 5-1 to n in the data center DS.
[0058]
FIG. 3 is a flowchart showing a specific example of the operation of the time correction system shown in FIGS. The operation of the time correction system configured as described above will be described with reference to FIG.
[0059]
In step ST1, the time management device receives time information transmitted from a GPS satellite at a predetermined timing, for example, several times a day, by the GPS receiving circuit 21. The time information is output from the GPS receiving circuit 21 to the master clock 22, and the master clock 22 corrects the time measured based on the time information (ST2).
[0060]
In step ST3, the primary NTP server 23 outputs time information measured by the parent clock 22 to the first time providing device 3 via the communication network 61 at a predetermined timing. Also, when a request for time information is received from the first time providing device 3, the time signal including the time information of the parent clock 22 is transmitted via the communication network 61 using, for example, the network time protocol. Supply to the providing device 3.
[0061]
In step ST <b> 4, in the first time providing device 3, the secondary NTP server 31 receives the time signal output from the primary NTP server 23 via the communication network 61 by the communication interface 311.
In step ST5, the CPU 315 extracts only the time information from the time signal based on the time signal output from the communication interface 311.
For example, in detail, the CPU 315 stores unnecessary information removal information D_D for removing unnecessary information in the memory 313 in advance, and from the time signal received by the communication interface 311 based on the unnecessary information removal information D_D. Then, unnecessary information is removed and only time information is extracted.
[0062]
In step ST6, the CPU 315 corrects the time measured by the time measuring unit 312 based on the time information.
[0063]
In step ST <b> 7, the CPU 315 transmits a time signal including time information to the second time providing device 4 through the network card 314, the router 33, and the communication line 63 at a predetermined timing.
[0064]
In step ST8, in second time providing apparatus 4, CPU 415 extracts only time information from the time signal based on the time signal received via communication line 63, router 42, and network card 411. (ST9).
For example, in detail, the CPU 415 stores unnecessary information removal information D_D for removing unnecessary information in the memory 414 in advance, and based on the unnecessary information removal information D_D, from the time signal received by the network card 411. Then, unnecessary information is removed and only time information is extracted.
[0065]
In step ST10, the CPU 415 corrects the time measured by the time measuring unit 412 based on the time information.
[0066]
In step ST11, the CPU 415 supplies (transmits) the time information measured by the time measuring unit 412 to the information processing apparatuses 5-1 to 5-1n via the wireless router 413 at a predetermined timing.
In step ST12, in the information processing devices 5-1 to n, the time information output from the second time providing device 4 via the wireless router 413 is received by the wireless router 501, and based on the time information, the time measuring unit 502 is received. The time information timed at is corrected (ST13).
[0067]
As described above, the time management device 2 is provided with the time information transmission unit 231 that transmits a time signal including time information, and the first time providing device 3 includes a time measurement unit 312 that measures time. Based on the time signal output from the time information transmission unit 231, an extraction unit 3151 that extracts only time information from the time signal, and the time information of the time measuring unit 312 based on the time information extracted by the extraction unit 3151 And a network card 314 that outputs a time signal including time information to the second time providing device via the router 33, and the second time providing device 4 includes the first time. The network card 411 that receives the time signal including the time information output from the providing device 3 via the router 42, and the time information from the time signal received by the network card 411. An extraction unit 4151 for extracting the time information, a correction unit 4152 for correcting the time information of the time measuring unit 412 based on the extracted time information, and a wireless router 413 for transmitting the time information to the information processing devices 5-1 to n. Therefore, in the information processing devices 5-1 to n, the time information output from the second time providing device 4 is received by the wireless router 501, and the time information of the time measuring unit 502 is corrected based on the time information. .
Therefore, it is possible to provide a time correction system and a time correction method that can prevent damage such as unauthorized access.
[0068]
In addition, the information processing devices 5-1 to n in the data center DS can automatically correct the time information without manually correcting the time.
[0069]
Since the first time providing device 3 in the adjacent facility SS outside the data center DS is provided and the second time providing device 4 is provided in the data center DS, the information processing device 5-1 in the data center DS is provided. ˜n has a high security with respect to the transmission route of time information because unnecessary information from outside does not enter.
[0070]
Since the first time providing device 3 is provided with the reference clock 32 that is referred to when the communication state is bad, the second time providing stable and highly accurate time information even in such an adverse condition. The information can be provided to the information processing devices 5-1 to 5-n via the device 4.
[0071]
Note that the present invention is not limited to the present embodiment, and various suitable modifications can be made.
For example, in the above-described embodiment, the first time providing device 3 and the second time providing device 4 are provided. However, the first time providing device 3 and the second time providing device are provided in the same device. Four components may be provided.
[0072]
In the present embodiment, the GPS satellite 201 is used as the standard time providing device and the time correction processing is performed based on the time information transmitted from the GPS satellite 201. However, the present invention is not limited to this mode.
For example, a transmitting station that transmits a standard radio wave including a standard time signal is a standard time providing device, and a circuit that receives the standard radio wave and performs time correction processing based on the standard time signal is provided. Even when the signal cannot be received, the time correction process can be performed by receiving the standard radio wave.
[0073]
【The invention's effect】
According to the present invention, it is possible to provide a time correction system and a time correction method capable of preventing damage such as unauthorized access.
[Brief description of the drawings]
FIG. 1 is an overall view of an embodiment according to a time correction system of the present invention.
FIG. 2 is a functional block diagram showing a specific example of the time correction system shown in FIG.
3 is a flowchart showing a specific example of the operation of the time correction system shown in FIGS. 1 and 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Time correction system, 2 ... Time management apparatus, 3 ... 1st time provision apparatus, 4 ... 2nd time provision apparatus, 5 ... Information processing apparatus, 7 ... Terminal device, 21 ... Reception circuit, 22 ... Master clock , 23 ... Primary NTP server, 31 ... Secondary NTP server, 32 ... Reference clock, 33 ... Router, 41 ... Time correction server, 42 ... Router, 50 ... Information processing system, 51 ... Storage, 52 ... Fiber channel Switch 53: Load distribution device 54 ... Switch 55 ... Firewall 61 ... Communication network 62 ... Communication network 63 ... Communication line 201 ... GPS satellite 221 Time correction unit 231 Time information transmission unit , 31 ... Secondary NTP server, 311 ... Communication interface (Interface: I / F), 312 ... Time measuring unit, 313 ... Memory, 314 ... Network 315 ... CPU, 411 ... network card, 412 ... timer, 413 ... wireless router, 414 ... memory, 415 ... CPU, 3151 ... extractor, 3152 ... corrector, 4151 ... extractor, 4152 ... corrector.

Claims (12)

A time correction system comprising: a time management device that manages time information; and a time providing device that provides the time information to an information processing device that corrects internal time.
The time management device has time information transmission means for transmitting a time signal including the time information,
The time providing device is a time measuring means for measuring time,
Extraction means for extracting only the time information from the time signal based on the time signal output from the time information transmission means;
Correction means for correcting time information of the time measuring means based on the time information extracted by the extracting means;
A time correction system comprising providing means for providing the time information to the information processing apparatus. The extraction unit removes the unnecessary information from the time signal transmitted from the time information transmission unit based on unnecessary information removal information for removing unnecessary information that is set in advance. The time correction system according to claim 1, wherein only the information is extracted. The time correction system according to claim 1, wherein the time information transmission unit transmits a time signal including the time information via a communication network. 4. The time management apparatus according to claim 1, further comprising a time correction unit that receives a standard time signal provided from a standard time providing apparatus and corrects the managed time information based on the standard time signal. The time correction system described in Crab. A time correction system comprising a time management device that manages time information, a first time providing device, and a second time providing device that provides the time information to an information processing device that corrects internal time,
The time management device has time information transmission means for transmitting a time signal including the time information,
The first time providing device includes time measuring means for measuring time,
Extraction means for extracting only the time information from the time signal based on the time signal output from the time information transmission means;
Correction means for correcting time information of the time measuring means based on the time information extracted by the extracting means;
Transmission means for outputting the time information to a second time providing device,
The second time providing apparatus includes a time information providing unit that receives the time information output from the first time providing apparatus and provides the time information to the information processing apparatus. The extraction unit removes the unnecessary information from the time signal transmitted from the time information transmission unit based on unnecessary information removal information for removing unnecessary information that is set in advance. The time correction system according to claim 5, wherein only the information is extracted. The time correction system according to claim 5 or 6, wherein the time information transmission unit transmits a time signal including the time information via a communication network. The said time management apparatus has a time correction | amendment means which receives the standard time signal provided from a standard time provision apparatus by a radio | wireless system, and correct | amends the managed time information based on the said standard time signal. The time correction system according to any one of 7. The time correction system according to claim 5, wherein the transmission unit transmits the time information to the second time providing apparatus through a dedicated line. The second time providing device includes:
A second time measuring means for measuring time;
Second extraction means for extracting only the time information from the time signal based on the time signal output from the transmission means;
Second correction means for correcting time information of the second time measuring means based on the time information extracted by the second extraction means;
The time correction system according to claim 5, wherein the time information providing unit provides time information of the second time measuring unit to the information processing apparatus. A time correction method for a time correction system, comprising: a time management device that manages time information; and a time providing device that provides the time information to an information processing device that corrects internal time.
The time management device transmits a time signal including the time information;
The time providing device extracts only the time information from the time signal based on the transmitted time signal,
Based on the extracted time information, correct the time information being timed,
A time correction method for providing the time information to the information processing apparatus. Time correction method for time correction system having time management device for managing time information, first time providing device, and second time providing device for providing time information to information processing device for correcting internal time Because
The time management device transmits a time signal including the time information;
The first time providing device extracts only the time information from the time signal based on the transmitted time signal,
Based on the extracted time information, correct the time information being timed,
Outputting the time information to a second time providing device;
The time correction method, wherein the second time providing device receives the time information output from the first time providing device and provides the time information to the information processing device.

Images