JP2010146257A - Information processor, program update method, and information processing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To resume, even when update of a program in an information processor is interrupted, the update of the program from the vicinity of the position where the program is interrupted. <P>SOLUTION: The information processor which records a management flag 32 for managing the states of N pieces of division data 0 to N-1 configuring an update object program 31 in a nonvolatile storage device 13, designates update object division data by referring to the management flag 32, and updates the update object division data by using data 35 for update, when the update of the update object program 31 is interrupted, specifies division data which have not been updated when the update of the update object program 31 is interrupted by referring to the management flag 32 when the update is resumed, and designates the specified division data as the update object division data. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a program update method.

  Conventionally, as a technique for updating data using differences, for example, the reference status of old files and the update status of new files in differential deployment are stored in nonvolatile memory, and the extent to which differential deployment has been executed is sequentially grasped By doing so, there is a technology that enables resumption from the point of interruption (see Patent Document 1).

In addition, as a technology for saving data, even if the capacity of the divided area provided in the system memory is uneven, the amount of unsaved data that should be saved from the system memory to the nonvolatile memory can be saved at power-off. When a technique for constantly suppressing the amount below the amount (see Patent Document 2) and dividing the display screen of the mobile terminal into a plurality of divided areas and assigning an application to each divided area, the focus moves from a certain divided area. There is a technique of saving the last screen displayed in the divided area, and saving the data by interrupting the execution of the application assigned to the divided area (see Patent Document 3).
JP 2003-337723 A JP 2008-97169 A JP 2008-117181 A JP 2002-318632 A

  Generally, in an information processing apparatus, a program is updated in order to keep the program in the latest state. In addition, in order to improve the convenience of program update, there is a technique in which update information of a program is notified to an information processing apparatus as needed, and when there is an update program, the information processing apparatus automatically updates the program. However, in such a program update process, the program update process may be interrupted due to power-off of the information processing apparatus. In particular, since it is difficult for the user to predict the start timing of the update process in the automatic program update, the update process is likely to be stopped during the update. In particular, when the update is suddenly interrupted due to a power interruption or the like, it is difficult to grasp the interrupt position, so it is necessary to update the program from the beginning again at the next startup.

  In particular, in a program update of a device not equipped with an HDD (Hard Disk Drive) or the like, the update program cannot be downloaded once to a nonvolatile storage device and stored. It disappears and you need to start over from downloading the data again. Such a state is disadvantageous in terms of communication cost as well as time.

  In view of the above problems, an object of the present invention is to enable resuming of the update from the vicinity of the interrupted position even when the update of the program in the information processing apparatus is interrupted.

  In order to solve the above-described problem, the present invention divides a program to be updated into a plurality of pieces of divided data, updates each piece of divided data while managing the update status of these pieces of divided data, and resumes updating. By referring to the information for management at the time, even when the update of the program in the information processing apparatus is interrupted, the update can be restarted from the vicinity of the interrupted position.

  Specifically, the present invention refers to information recording means for recording, in a nonvolatile storage device, divided data management information for managing the states of a plurality of divided data constituting the update target program, and the divided data management information. Then, update target divided data specifying means for specifying update target divided data to be updated from among the plurality of divided data, and update data acquisition for acquiring update data for updating the update target split data And update means for updating the update target divided data using the update data, the update target divided data specifying means, when updating of the update target program is interrupted, By referring to the divided data management information, the divided data that has not been updated at the time of the update interruption is identified, and the identified divided data is referred to as the update target divided data. Specify Te, an information processing apparatus.

  Here, the update target program is a program to be replaced by a new update program among the programs installed in the information processing apparatus. In the present invention, the update target program includes a plurality of pieces of divided data. For example, the divided data may be data divided by dividing the update target program into predetermined data sizes. By making the divided data into data obtained by dividing the update target program by a predetermined size, it becomes easy to secure an area for saving the divided data or temporarily saving the update data. The process of extracting the difference and generating update data based on the difference is facilitated. However, the divided data may not have a predetermined data size and may have different data sizes. The divided data may be data delimited based on addresses or sectors in the storage device in which the update target program is recorded, or data delimited in a unique unit set in advance in the update target program It may be.

  The divided data is managed using the divided data management information when the update target program is updated. The divided data management information is information for managing the state of each of the plurality of divided data, updated as the update target program update process proceeds, and referred to when designating the update target divided data.

  The present invention records the divided data management information in the nonvolatile storage device according to the progress of the update target program update process, so that even when the update process of the update target program is interrupted due to a power failure or the like, When resuming, updating can be resumed from the previously interrupted divided data. In particular, in the present invention, since the divided data management information having a smaller data size than the update program used for the update is recorded in the nonvolatile storage device, a nonvolatile storage device having a capacity sufficient to hold the update program is provided. Even in an information processing apparatus that is not provided, it is possible to resume acquisition and update of update data from the vicinity of the interruption position without having to download from the beginning of the update program. In addition, since acquisition of update data is resumed from the vicinity of the interruption position, even when data is acquired over a network, it is advantageous in terms of communication cost compared to the conventional technology.

  The information processing apparatus according to the present invention further includes a difference acquisition unit that acquires a difference between the update target program and an update program that replaces the update target program, and the update data acquisition unit includes the current update target. The update data may be generated by reflecting the portion corresponding to the update target divided data in the difference in the divided data to generate the update data. By generating update data using the acquired difference, it is possible to suppress the amount of data acquired from the outside, and to suppress resources, time, cost, and the like required for the update process.

The information processing apparatus according to the present invention may further include a divided data saving unit that saves the update target divided data to a predetermined saving area before the update by the updating unit. By providing the divided data saving means, when an update interruption due to a power interruption occurs at the timing when the update target divided data is deleted to update or the update target divided data is overwritten with the update data However, it is possible to restart the update using the saved data.

  Further, the information recording means includes a state where each of the plurality of divided data is not updated, a state where the divided data saving means is saved, and a state where the updating by the updating means is completed. Information for determining which state is a plurality of states including at least three states may be recorded as the divided data management information.

  In this case, the update target divided data specifying means refers to the information indicating these states to determine whether the update target program is being updated, and if so, how far the update has progressed. Can be judged. For example, when the divided data is sequentially updated from the top, the update target divided data specifying means sets the divided data in which the information indicating the saved state is set, or the divided data in which the information indicating the unprocessed state is set. The first divided data can be determined as the divided data that was being updated at the time of the previous interruption, and the update target divided data designation means determines that this divided data is the first update target when updating is resumed. Can be specified as divided data.

  The present invention can also be understood as an information processing system including a plurality of information processing apparatuses. For example, the present invention is a master device that holds an update program and a slave device that holds an update target program that is an update target using the update program, and includes a plurality of pieces of divided data constituting the update target program. Information recording means for recording the divided data management information for managing the state in a nonvolatile storage device, and referring to the divided data management information, the update target divided data to be updated among the plurality of divided data Update target split data specifying means to be specified, difference acquisition means for acquiring a difference between the update target program and the update program replacing the update target program, and the update target split among the differences to the current update target split data By reflecting the portion corresponding to the data, the update data for updating the update target divided data is changed. Update data acquisition means to be obtained, and update means for updating the update target split data using the update data, wherein the update target split data specifying means is updated when the update of the update target program is interrupted. An information processing system comprising: a slave device that identifies the divided data that has not been updated when the update is interrupted by referring to the divided data management information at the time of restart, and that specifies the identified divided data as the divided data to be updated It is.

  With this configuration of the information processing system, in the present invention, an information processing apparatus that does not include a nonvolatile storage device having a sufficient capacity to hold an update program is set as a slave device, and the update program is held. By using an information processing device with a sufficient capacity non-volatile storage device as a master device, even an information processing device that does not have a sufficient capacity non-volatile storage device can be downloaded from the beginning of the update program. This makes it possible to resume the acquisition and update of update data from the vicinity of the interruption position.

  Furthermore, the present invention can also be grasped as a method executed by a computer or a program for causing a computer to function as each of the above means. Further, the present invention may be a program in which such a program is recorded on a recording medium readable by a computer, other devices, machines, or the like. Here, a computer-readable recording medium is a recording medium that stores information such as data and programs by electrical, magnetic, optical, mechanical, or chemical action and can be read from a computer or the like. Say.

According to the present invention, even when the program update in the information processing apparatus is interrupted, the update can be restarted from the vicinity of the interrupted position.

  Embodiments of an information processing apparatus, a program update method, and a program according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating an outline of an in-vehicle device according to the present embodiment and a system for updating a program of an information processing device included in the in-vehicle device. The in-vehicle device 1 displays information for the user and performs navigation by displaying a map image or the like on the touch panel display 2 in response to the user input from the touch panel display 2 and the touch panel display 2 that receives input from the user. Navigation device 3, audio device 4 that generates sound signals from a source such as a CD (Compact Disc) or radio broadcast wave, and provides the sound to the user via a speaker installed in the vehicle, DVD (Digital Versatile Disc) A DVD deck 5 that generates a video signal and an audio signal from the touch panel display 2 and the speaker, and generates a video signal and an audio signal based on the received digital broadcast wave from the touch panel display 2 and the speaker. DTV device 6 to view digital TV broadcasts to users by force, with each information processing apparatus etc., these devices are communicatively connected to each other.

  Each information processing apparatus provided in the in-vehicle device 1 has a dedicated or general-purpose processor, ROM, RAM (Random Access Memory), etc., and the processor executes a program developed in the ROM or RAM, respectively. It is a computer which provides the function which this information processing apparatus has to a user or another connected information processing apparatus. In the present embodiment, a program executed for providing a function by each information processing apparatus can be updated via a network.

  The program is updated by downloading the update program 91 stored in the server 9 via the network and rewriting the previous program (usually overwritten). Here, the in-vehicle device 1 in the present embodiment is provided with an interface for connection to the mobile phone terminal 7, and the in-vehicle device 1 uses the mobile phone terminal 7 connected through this interface to The update program 91 is downloaded by connecting to the server 9 via the network. The mobile phone terminal 7 connection interface provided in the in-vehicle device 1 may be a wired interface such as USB (Universal Serial Bus) or a wireless interface such as Bluetooth.

  Hereinafter, program update processing of the touch panel display 2, the audio device 4, the DVD deck 5, and the DTV device 6 that do not have an HDD among the information processing devices provided in the in-vehicle device 1 will be described. In the present embodiment, the navigation device 3 that is an HDD-mounted device operates as a master in the update process, and the touch panel display 2, the audio device 4, the DVD deck 5, and the DTV device 6 that are non-HDD mounted devices each operate as a slave. . However, the navigation device 3 that is the master also performs update processing similar to the flow of update processing described below, which sequentially updates the divided data managed by the management flag 32, as with other information processing devices. Is possible.

FIG. 2 shows an outline of the configuration of the navigation device 3 that operates as a master and the information processing device (for example, the DVD deck 5) that operates as a slave in the update processing according to the present embodiment, and the data of the update target program 31 and the management flag 32. It is a figure which shows the outline of a structure. First, among the devices provided in the in-vehicle device, the navigation device 3 in which the HDD is mounted checks whether there is an unapplied update program 91 in the server 9 via the network, and if there is, this update. Download the program 91 and save it in the HDD. In addition to the update program 91 applied to the navigation device 3 itself, the downloaded update program 91 includes devices other than the navigation device connected to the vehicle-mounted device, that is, the touch panel display 2, the audio device 4, the DVD deck 5, and the DTV. An update program 91 applied to slaves such as the device 6 is also included.

  Here, in the present embodiment, devices other than the navigation device 3 provided in the in-vehicle device do not include the HDD, and therefore the update process cannot be performed after the entire update program 91 is stored in the own device. For this reason, in this embodiment, the navigation device 3 that is an HDD-equipped device operates as a master, and the non-HDD-equipped device such as the DVD deck 5 operates as a slave, so that the update program 91 stored in the master and the slave Only the difference from the installed update target program 31 is downloaded to the slave.

  In this way, the program can be updated even in a device that does not include a large-capacity nonvolatile storage device such as an HDD. In the present embodiment, since the slave device such as the DVD deck 5 does not have a network connection function, the update program 91 is once downloaded to the navigation device as a master, and the update target program 31 and the update program are downloaded from here. However, in some embodiments, the update program 91 and the difference data 33 are acquired by directly connecting the device on which the update target program 31 is installed to the server 9. Also good. For example, since the navigation device 5 in this embodiment has a function of controlling the mobile phone terminal 7 and connecting to the network, the navigation device 5 directly connects to the server 9 without operating as a slave, and the update program 91 for the own device or the difference Data 33 can be acquired.

  The slave information processing apparatus is a computer including a CPU (Central Processing Unit) 11, a RAM 12, and an EEPROM (Electrically Erasable and Programmable Read Only Memory) 13. The slave EEPROM 13 is a program for the slave to provide various functions of the device itself (for example, a DVD playback function when the slave is the DVD deck 5), and is updated by the update processing in this embodiment. Update target program 31, a management flag 32 (corresponding to the divided data management information of the present invention) for managing the update status of the update target program 31, the difference data 33 downloaded from the master, and the update target Divided data save data 34 included in the program 31 is recorded. The slave RAM 12 holds update data 35 for replacing the divided data included in the update target program 31.

  In this embodiment, the update target program 31 is divided into N pieces of divided data with indexes 0 to N−1 from the top by being divided for each predetermined data size. These divided data are update units in an update process to be described later. The management flag 32 is a flag indicating the state of the divided data for each of the plurality of divided data. The same number (N) of management flags 32 as the divided data are prepared, and the same index (0 to N-1) as the corresponding divided data is attached. In the present embodiment, the update target program 31 is updated in units of divided data, and the progress of the update is managed using the management flag 32, so that the interrupted update process can be restarted from an appropriate position. Yes.

FIG. 3 is a diagram illustrating a functional configuration of the information processing apparatus that functions as a slave in the present embodiment. The slave according to the present embodiment records a management flag 32 for managing the states of a plurality of divided data constituting the update target program 31 in the EEPROM 13 by the processor executing the program expanded in the ROM or RAM 12. Referring to the information recording unit 22 and the management flag 32, the update target divided data specifying unit 23 for specifying the update target divided data to be updated, and the update target divided data are saved before the update target divided data is updated. Update by reflecting the difference data 33 in the divided data saving unit 24 that saves to the area, the difference acquisition unit 25 that acquires the difference data 33 between the update target program 31 and the update program 91, and the current update target divided data An update data acquisition unit 26 that generates update data 35 for updating the target divided data, and an update data An updating unit 27 for updating the update target data segment with data 35, which functions as an information processing apparatus including a.

  In the present embodiment, the information recording unit 22 sets the management flags 0 to N−1 to “unprocessed” flags indicating that the corresponding divided data has not been updated, and saves the corresponding divided data to the divided data. One of a “saved” flag indicating a state saved by the unit 24 and an “updated” flag indicating a state where the update of the corresponding divided data by the updating unit 27 is completed is set.

  4 and 5 are flowcharts showing the flow of update processing of the information processing apparatus according to the present embodiment. In the processing shown in this flowchart, the navigation apparatus 3 detects that the program currently installed in the information processing apparatus is not the latest program and the server 9 has the update program 91, and further operates as a master. 3 is started when the slave update program 91 is downloaded. More specifically, the master acquires the version information of the program (update control program 31) on the information processing apparatus and the version information of the update program 91 uploaded to the server 9 collected from the information processing apparatus as the slave. By comparing, it is determined whether or not there is an update program 91 to be downloaded to the server 9. If the version information is newer than the program on the information processing apparatus, the update program 91 is to download.

  In this embodiment, since the slave device does not have a network connection function as described above, the version information comparison and the update program 91 are downloaded by the master navigation device. May compare the version information and acquire the difference data 33 by directly connecting the apparatus in which the update target program 31 is installed to the server 9. Note that the processing order shown in the flowchart is an example, and the processing order can be appropriately changed according to the embodiment without departing from the scope of the present invention.

  In step S101, a program update request from the master is received. At this point, the navigation device 3 that is the master in the update process detects that the server 9 has the slave update program 91, downloads this update program 91, and the HDD of the navigation device 3 (not shown). To save. In addition, when a plurality of information processing apparatuses are connected as slaves to the master, before the master transmits a program update request to the information processing apparatus operating as a slave, It is necessary to determine whether the update program 91 is for the slave. In the present embodiment, it is possible to determine which information processing apparatus is the updated update program 91 by downloading a list of update target devices together with the update program 91. I can do it. More specifically, the master collates the model number of the slave unit management table held in advance by the master with the list of devices to be updated (list of model numbers), so that the downloaded program It is determined whether the update program 91 is for the information processing apparatus. The information processing apparatus operating as a slave receives the program update request transmitted from the navigation apparatus 3 that stores the update program 91 in the HDD, and starts the subsequent program update process. Thereafter, the process proceeds to step S102.

  In step S102, it is determined whether the program update process is interrupted. The update target divided data specifying unit 23 determines whether or not the program update process is interrupted by referring to all the management flags. More specifically, when “updated” or “unprocessed” is set in all the management flags, this indicates that the program update processing has not been started or has been completed normally. The update target divided data specifying unit 23 determines that the program update process is not interrupted. If it is determined that there is no interruption in the program update process, the process proceeds to step S103.

  On the other hand, if any of the management flags is set to “saved”, this means that in the program update process, after the save process described later is completed, the update of the saved divided data is completed. This indicates that the program update process is interrupted during the period (between steps S115 and S118 described later) due to a power failure or the like. For this reason, the update target divided data specifying unit 23 determines that the program update process is interrupted. Also, there is no management flag that is set to “Saved”, but if the “Updated” flag and the “Unprocessed” flag are mixed, this means that the update is completed for all the divided data in the program update process. In this state, the program update process is interrupted due to a power failure or the like. For this reason, the update target divided data specifying unit 23 determines that the program update process is interrupted. If it is determined that the program update process is interrupted, the process proceeds to step S107.

  In steps S103 to S106, initialization processing for sequentially updating the entire update target program 31, that is, divided data from divided data 0 to divided data N-1, is performed. More specifically, when it is determined in step S102 that there is no interruption in the program update process, first, the information recording unit 22 initializes the management flag by setting all the management flags to “unprocessed”. (Step S103). This is because the progress of the update process can be grasped by sequentially changing the management flag to “saved” or “updated” in the subsequent process.

  And the difference acquisition part 25 erase | eliminates the difference data 33 (step S104), and downloads the difference data 33 of the update object program 31 and the update program 91 from the navigation apparatus 3 which is a master (step S105). That is, in this embodiment, since only the difference data 33 is downloaded instead of the entire update program 91, the device in which the update target program 31 such as the DVD deck 5 is installed needs to have a large capacity storage device. Absent. The difference data is obtained by comparing the execution files of the update target program and the update program in machine language and extracting the difference. More specifically, the master compares the update target program 31 on the information processing apparatus and the update program 91 whose version information is newer than the update target program 31 for each target divided data. Extract the difference.

  Further, the update target divided data designating unit 23 sets 0 to an index i that is a variable for managing the update target divided data (step S106). The index i is an index for indicating the divided data i as the current update target divided data. In this embodiment, since the update is sequentially performed from the divided data 0, 0 is set in i. Thereafter, the process proceeds to step S108.

In step S107, the first update target divided data in the resumption of the interrupted update process is set. That is, when it is determined in step S102 that the program update process is interrupted, the update target divided data specifying unit 23 determines the number of the divided data when there is divided data for which “saved” is set. Is updated by setting the number of the highest-order divided data among the divided data for which “unprocessed” is set to the index i. Determine the target split data. Thereafter, the process proceeds to step S108.

  In step S108 and step S120, it is determined whether or not the program update process has ended. If it is determined that the program update process has ended, a completion notification is sent to the master. The update target divided data designating unit 23 compares the index i with the number of pieces of divided data included in the update target program 31 to determine whether or not the update has been completed for all the divided data (step S108). . In other words, since there are N pieces of divided data in the present embodiment, the update process is completed while the index i for specifying the divided data to be updated in order from the top is smaller than N by adding one by one. If the index i is greater than or equal to N, it indicates that the update process has been completed. If the index i is greater than or equal to N, the slave information processing apparatus notifies the navigation apparatus 3 that is the master that the program update process has been completed (step S120), and the process illustrated in this flowchart ends. To do. If the index i is smaller than N, the process proceeds to step S109.

  In step S109, it is determined whether or not there is difference data 33 corresponding to the update target divided data. The update data acquisition unit 26 refers to the difference data 33 downloaded from the master and determines whether or not there is difference data 33 used for updating the update target divided data, that is, the divided data i. If there is no corresponding difference data 33, it is not necessary to update the divided data i, so the process proceeds to step S118. If there is corresponding difference data 33, the process proceeds to step S110.

  In step S110 to step S112, it is determined whether or not the management flag corresponding to the update target divided data is “saved”, and the update data is based on the divided data i or the saved data 34 according to the determination result. 35 is generated. The update data acquisition unit 26 determines whether or not the management flag corresponding to the update target divided data, that is, the management flag i is set to “saved” (step S110). When the management flag i is set to “saved”, the divided data i to be updated may have been deleted in the process of step S116 described later or may be damaged during the update. The data acquisition unit 26 merges the difference data 33 with the saved data 34 to generate update data 35 for updating the divided data i and stores it in the RAM 12 (step S112). After the process in step S112, the process proceeds to step S116. On the other hand, if the management flag i is not set to “saved”, the divided data i to be updated is in a state before being updated. The update data 35 is generated by merging the difference data 33 and stored in the RAM 12 (step S111). After the process in step S111, the process proceeds to step S113.

  In step S113 to step S115, the update target divided data is saved. The divided data saving unit 24 erases the old saved data 34 recorded in the save area of the EEPROM 13 (step S113), and copies the divided data i to the save area (step S114). Then, the information recording unit 22 sets, in the management flag i, a “saved” flag indicating that the saving of the divided data i is completed in the management flag i (step S115). Thereafter, the process proceeds to step S116.

  In step S116 and step S117, the update target divided data is updated. The updating unit 27 erases the divided data i recorded in the EEPROM 13 (step S116), and updates the divided data i by writing the update data 35 prepared in the RAM 12 in the erased area (step S117). ). Thereafter, the process proceeds to step S118.

  In steps S118 and S119, the management flag i is set to “updated”, and 1 is added to the index i. When it is determined in step S109 that the divided data i does not need to be updated, and when the update of the divided data i is completed in the processing from step S110 to step S117, the information recording unit 22 manages the management corresponding to the divided data i. The flag i is set to “updated” (step S118). Then, the update target divided data specifying unit 23 adds 1 to the index i (increments the index i) to specify the next divided data of the updated divided data as new update target divided data. (Step S119). Thereafter, the process proceeds to step S108.

  That is, the processes shown in steps S108 to S119 are repeated until the presence or absence of the difference data 33 is confirmed for all the divided data and the update is completed or the update process is interrupted due to a cause such as power interruption. It is. When the update is completed for all the divided data, the slave information processing device notifies the master navigation device 3 that the program update processing has been completed (step S120), and the processing shown in this flowchart is as follows. finish.

  According to the present embodiment, even when the program update in the information processing apparatus is interrupted due to a sudden power interruption or the like, the update can be restarted from the vicinity of the interrupted position. More specifically, even if it is interrupted due to a power interruption or the like during the update, according to the processing shown in the flowcharts of FIGS. 4 and 5, which management flag is set to “saved”? Alternatively, since the “updated” management flag and the “unprocessed” management flag exist at the same time, it is possible to grasp the divided data that was being updated at the time of interruption and restart the update from here. In addition, before erasing or overwriting the divided data, the divided data is saved, and this is indicated by the “saved” flag, so even if the divided data in the update target program is damaged or erased, Updating can be resumed using the save data 34.

  The management flag is all “updated” or all “unprocessed” because the update has not started or the update has been completed. It may start with data (see step S102).

It is a figure which shows the outline of the system which updates the program of the vehicle equipment which concerns on embodiment, and the information processing apparatus contained in this vehicle equipment. It is a figure which shows the outline of the structure of the master in the embodiment, and a slave, and the outline of the data structure of an update object program and a management flag. It is a figure which shows the function structure of the information processing apparatus which functions as a slave in embodiment. It is a flowchart which shows the flow of the update process of the information processing apparatus which concerns on embodiment. It is a flowchart which shows the flow of the update process of the information processing apparatus which concerns on embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle equipment 3 Navigation apparatus 31 Update object program 32 Management flag 22 Information recording part 23 Update object division | segmentation data designation part 24 Divided data saving part 25 Difference acquisition part 26 Update data acquisition part 27 Update part 91 Update program

Claims (6)

Information recording means for recording, in a nonvolatile storage device, divided data management information for managing the states of a plurality of divided data constituting the update target program;
Update target divided data specifying means for specifying update target divided data to be updated among the plurality of divided data with reference to the divided data management information;
Update data acquisition means for acquiring update data for updating the update target divided data;
Updating means for updating the update target divided data using the update data,
The update target divided data specifying means specifies and specifies the divided data that has not been updated at the time of the update interruption by referring to the divided data management information when the update is resumed when the update of the update target program is interrupted. An information processing apparatus that designates the divided data as the update target divided data. A difference acquisition unit that acquires a difference between the update target program and an update program that replaces the update target program;
The update data acquisition means generates the update data by reflecting a portion corresponding to the update target divided data in the difference in the current update target divided data.
The information processing apparatus according to claim 1. Before the update by the updating means, further comprising a divided data saving means for saving the update target divided data to a predetermined saving area;
The information processing apparatus according to claim 1 or 2. The information recording means includes three states: a state where each of the plurality of divided data is not updated, a state where the divided data saving means is saved, and a state where the updating by the updating means is completed. Information for determining which of a plurality of states including at least a state is recorded as the divided data management information,
The information processing apparatus according to claim 3. By computer
An information recording step of recording, in a nonvolatile storage device, divided data management information for managing a plurality of pieces of divided data constituting the update target program;
An update target divided data designation step for designating update target divided data to be updated among the plurality of divided data with reference to the divided data management information;
An update data acquisition step for acquiring update data for updating the update target divided data;
An update step of updating the update target divided data using the update data is performed,
In the update target divided data designation step, when the update of the update target program is interrupted, the divided data that has not been updated at the time of the update interruption is identified and identified by referring to the divided data management information when the update is resumed. The program update method, wherein the divided data is designated as the update target divided data. A master device that holds the update program;
A slave device that holds an update target program to be updated using the update program,
Information recording means for recording, in a nonvolatile storage device, divided data management information for managing the states of a plurality of divided data constituting the update target program;
Update target divided data designating means for designating update target divided data to be updated among the plurality of divided data with reference to the divided data management information;
Difference acquisition means for acquiring a difference between the update target program and the update program replacing the update target program;
Update data acquisition means for acquiring update data for updating the update target split data by reflecting a portion corresponding to the update target split data in the difference in the current update target split data; and Update means for updating the update target divided data using the update data,
The update target divided data specifying means specifies and specifies the divided data that has not been updated at the time of the update interruption by referring to the divided data management information when the update is resumed when the update of the update target program is interrupted. Specifying the divided data as the update target divided data, and a slave device;
An information processing system comprising:

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