JP2013145518A - Communication device, communication system, communication method, and communication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication device for shortening a period of time until it becomes a screen sharing state.SOLUTION: The communication device is a master unit 10 that shares a screen with a slave unit 30, and includes a display unit 11 for displaying information on a screen, an operation unit 14 for receiving operation, and a communication unit 13 for transmitting information on a final screen displayed on the display unit 11 at the time of stop of operation through the operation unit 14, to the slave unit 30.

Description

  The present invention relates to a communication device, a communication system, a communication method, and a communication program. In particular, the present invention relates to a communication device that shares a screen with other communication devices.

  Conventionally, a screen sharing technique for sharing a screen between two electronic devices is known. As the screen sharing technology, there are a remote desktop technology and a VNC (Vertical Network Computing) technology.

  In addition, as an example of the screen sharing technique, Patent Document 1 discloses that a screen update information generation unit, a screen update information distribution unit, and a screen update information display unit are separated into a screen even in a situation where a plurality of platforms are mixed. Shown to share.

JP 2001-228242 A

  However, an electronic device that has been sharing a screen needs to perform a protocol process for sharing the screen again when the screen sharing is resumed after the screen sharing is once ended by turning off the power or the like. For this reason, it took some time for the screen to be shared again on the screen of the electronic device.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a communication device, a communication system, a communication method, and a communication program that can shorten the time until the screen is shared. .

  The communication device according to the present invention is a communication device that shares a screen with another communication device, the display unit displaying information on the screen, the operation unit that receives the operation, and the end of the operation by the operation unit A communication unit that transmits information on the final screen currently displayed on the display unit to the other communication device.

  Further, the communication device of the present invention is a communication device that shares a screen with another communication device, the communication unit that receives the information of the final screen at the time of the end of operation in the other communication device, A storage unit for storing information on the final screen received by the communication unit, a screen sharing start instruction unit for instructing start of screen sharing with the other communication device, and a screen sharing start instruction unit for sharing the screen. A display unit that displays a final screen stored by the storage unit when a start is instructed.

  The communication system of the present invention is a communication system that shares a screen between a first communication device and a second communication device, and the first communication device displays a first display unit that displays information on the screen. And an operation unit that accepts an operation, and a transmission unit that transmits information on the final screen displayed on the first display unit to the second communication device when the operation by the operation unit ends, The second communication device includes a receiving unit that receives information on the final screen transmitted by the transmitting unit of the first communication device, a storage unit that stores information on the final screen received by the receiving unit, A screen sharing start instructing unit for instructing start of screen sharing with the first communication device, and when the start of screen sharing is instructed by the screen sharing start instructing unit, the final screen stored by the storage unit is displayed. A second display unit.

  The communication method of the present invention is a communication method in a communication device that shares a screen with another communication device, and displays information on the screen at the end of the operation by the operation unit that accepts the operation. A step of transmitting information on a final screen displayed in the section to the other communication device.

  The communication method of the present invention is a communication method in a communication device that shares a screen with another communication device, and receives information on a final screen at the end of operation in the other communication device; Storing the received information of the final screen in a storage unit, instructing the start of screen sharing with the other communication device, and instructing the start of sharing of the screen, the storage Displaying a final screen stored in the display unit on the display unit.

  Moreover, the communication program of this invention is a program for making a computer perform each step of the said communication method.

  According to this configuration, method, or program, information on the final screen displayed on the display unit at the end of the operation is transmitted from the communication device on the transmission side to the communication device on the reception side. Therefore, when the communication device on the receiving side starts sharing the screen, the time until the screen sharing state is reached can be shortened by displaying the received final screen.

  According to the present invention, it is possible to shorten the time until the screen sharing state is reached.

The figure which shows the structural example of the communication system in the 1st Embodiment of this invention. The figure which shows the example of a screen transition until it reaches a screen sharing state between the main | base station and the subunit | mobile_unit in the 1st Embodiment of this invention. The sequence diagram which shows an example of the procedure until it reaches a screen sharing state between the main | base station and the subunit | mobile_unit in the 1st Embodiment of this invention The sequence diagram which shows an example of the procedure until it reaches a screen sharing state when the main | base station in the 1st Embodiment of this invention changes to a sleep state The sequence diagram which shows an example of the procedure until it reaches a screen sharing state in case the subunit | mobile_unit is in a sleep state in the 1st Embodiment of this invention The figure which shows the example of a display of each screen of a main | base station and a subunit | mobile_unit in the case of sharing a part of screen of the main | base station in the 1st Embodiment of this invention The figure which shows the structural example of the communication system in the 2nd Embodiment of this invention. The sequence diagram which shows an example of the procedure until it reaches a screen sharing state when the main | base station in the 2nd Embodiment of this invention changes to a sleep state The sequence diagram which shows an example of the procedure until it reaches a screen sharing state when the subunit | mobile_unit in the 2nd Embodiment of this invention changes to a sleep state The sequence diagram which shows an example of the procedure until either of the some main | base stations in the 3rd Embodiment of this invention and one subunit | mobile_unit reach a screen sharing state The figure which shows an example of the management table in the 3rd Embodiment of this invention. The sequence diagram which shows an example of the procedure until one parent machine in the 3rd Embodiment of this invention reaches a screen sharing state with several subunit | mobile_units

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The communication apparatus of this embodiment is applied to a communication system in which two communication apparatuses are connected by a communication line.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration example of a communication system 1 according to the first embodiment. In the communication system 1 shown in FIG. 1, a parent device 10 (an example of a communication device) and a child device 30 (an example of a communication device) are connected by a wireless LAN (an example of a wireless line). For example, WiFi (registered trademark) is adopted as the wireless LAN. Further, FIG. 1 mainly shows a functional configuration of a portion related to screen sharing of the parent device 10 and the child device 30. The base unit 10 is, for example, a notebook PC. The subunit | mobile_unit 30 is a smart phone and PC, for example. In addition, both the main | base station 10 and the subunit | mobile_unit 30 may perform not only wireless communication but wired communication.

  The base unit 10 includes a display unit 11, a screen sharing communication protocol unit 12, a communication unit 13, an operation unit 14, an operation end determination unit 15, a final screen transmission unit 16, a power management unit 17, and a restart request communication unit 18. Configured.

  The display unit 11 displays various information on the screen. For example, when screen sharing is performed, a screen shared with the child device 30 is displayed.

  The screen sharing communication protocol unit 12 generates data related to screen sharing and performs screen sharing with the slave unit 30 via the communication unit 13. For example, when screen sharing is performed, data to be transmitted to and received from the child device 30 is created. Here, a known protocol used in remote desktop technology such as VNC (Virtual Network Computing) is assumed as a screen sharing protocol. Thus, the screen sharing communication protocol unit 12 has a function as a screen sharing processing unit that performs screen sharing between the parent device 10 and the child device 30.

  The communication unit 13 is connected to the wireless LAN and transmits / receives data to / from the slave unit 30.

  The operation unit 14 is a mouse, a keyboard, a touch pad, or the like, and accepts user input operations.

  The operation end determination unit 15 determines the end point of the input operation by the operation unit 14 and notifies the final screen transmission unit 16 that the operation has ended.

  For example, when there is no input operation even after a predetermined time has elapsed, it is determined that the operation has been completed in conjunction with the screen backlight being turned off, the screen being turned off, and the hard disk being stopped. Further, it is determined that the operation is ended by closing a window of a specific application or closing all windows. Further, when the end of the operation of the base unit 10 (for example, sleep, standby, shutdown, logout) is explicitly selected by the operation unit 14 or the like, it is determined that the operation is ended.

  The final screen transmission unit 16 transmits the data of the final screen displayed on the screen of the display unit 11 to the slave unit 30 via the communication unit 13 at the end of the operation.

  The power management unit 17 manages the power on / off of the parent device 10. Further, the power supply management unit 17 has a resume function (Wake_on_LAN, Wake_on_WLAN, etc.) that maintains the operation state of only the communication unit 13 and stops the operation of other units in the parent device 10 when in the sleep state. Further, the power management unit 17 has a function as a state transition unit that performs state transition such as a sleep state and an active state in the parent device 10.

  The restart request communication unit 18 generates a resume request for shifting to the active state in order to cancel the sleep state of the slave unit 30 as the communication partner. This resume request is transmitted to the slave unit 30 by the communication unit 13.

  Although not shown, the base unit 10 is configured by a CPU and includes a control unit that performs various processes such as determination and setting.

  Note that the functions of the screen sharing communication protocol unit 12, the operation end determination unit 15, and the final screen transmission unit 16 are a screen sharing program stored in a ROM (not shown) by a CPU (not shown) in the base unit 10. Alternatively, it is realized by executing a communication program.

  The subunit | mobile_unit 30 has the communication part 31, the screen sharing communication protocol part 32, the operation part 33, the last screen receiving part 34, the last screen recording part 35, the display part 36, the restart request | requirement communication part 37, and the power supply management part 38. Configured.

  The communication unit 31 is connected to the wireless LAN and transmits / receives data to / from the parent device 10.

  The screen sharing communication protocol unit 32 generates data related to screen sharing and performs screen sharing with the parent device 10 via the communication unit 31. For example, when screen sharing is performed, data to be transmitted / received to / from the parent device 10 is created. Here, a known protocol used in remote desktop technology such as VNC (Virtual Network Computing) is assumed as a screen sharing protocol. Thus, the screen sharing communication protocol unit 32 has a function as a screen sharing processing unit that performs screen sharing between the parent device 10 and the child device 30.

  The operation unit 33 is a touch panel, a button, or the like, and accepts a user input operation. The operation unit 33 is provided with a screen sharing operation unit 33a that is operated when screen sharing is performed.

  The final screen receiving unit 34 receives the data of the final screen transmitted from the parent device 10 via the communication unit 31.

  The final screen recording unit 35 records the data of the final screen received by the final screen receiving unit 34 and outputs the data to the display unit 36.

  The display unit 36 displays various information. For example, when screen sharing is performed, a final screen recorded in the final screen recording unit 35 is displayed, or a screen shared with the parent device 10 is displayed.

  In addition, the restart request communication unit 37 generates a resume request for shifting to the active state in order to cancel the sleep state of the parent device 10 as the communication partner. This resume request is transmitted to base unit 10 by communication unit 31.

  The power management unit 38 manages power ON / OFF. In addition, the power management unit 38 has a resume function (Wake_on_LAN or the like) that maintains the operation state of only the communication unit 31 in the slave unit 30 and stops the operation of other units when in the sleep state. In addition, the power management unit 38 has a function as a state transition unit that performs state transition such as a sleep state and an active state in the slave unit 30.

  Although not shown, the slave unit 30 is configured by a CPU and includes a control unit that performs various processes such as determination and setting.

  The functions of the screen sharing communication protocol unit 32 and the final screen receiving unit 34 are such that a CPU (not shown) in the parent device 10 executes a screen sharing program or a communication program stored in a ROM (not shown). It is realized by.

  Next, an operation example up to the screen sharing state of the communication system 1 will be shown.

  2A to 2E are diagrams showing screen transition examples until a screen sharing state is reached between the parent device 10 and the child device 30. FIG. FIG. 3 is a sequence diagram illustrating an example of a procedure until the screen sharing state is reached between the parent device 10 and the child device 30. In a normal operation, as shown in FIG. 2A, different contents are displayed on the screens of the parent device 10 and the child device 30, respectively.

  When base unit 10 detects the end of operation by operation end determination unit 15 (T1 in FIG. 3), final screen data at the end of the operation is transmitted to sub unit 30 by final screen transmission unit 16 via communication unit 13. Is transmitted (T2 in FIG. 3). This final screen data is, for example, bitmap image data.

  When receiving the final screen data by the final screen receiving unit 34 via the communication unit 31 from the base unit 10, the slave unit 30 records the final screen data by the final screen recording unit 35 (T3 in FIG. 3). FIG. 2B shows a state in which the data on the final screen is transmitted from the parent device 10 that has detected the end of the operation to the child device 30 side and recorded. FIG. 2C shows the screen of the base unit 10 after the operation is completed, and further the screen of the base unit 30 that is continuously displayed during recording.

  The subunit | mobile_unit 30 waits until it detects the screen sharing operation through the screen sharing operation part 33a by a user, for example. Instead of directly instructing screen sharing using the screen sharing operation unit 33a, the user may instruct by executing application software (an example of an instruction from the screen sharing start instruction unit). The same applies to the following embodiments.

  When detecting the screen sharing operation (T4 in FIG. 3), the slave unit 30 reads the final screen data recorded in the final screen recording unit 35, and the display unit 36 displays the final screen (T5 in FIG. 3). . Thereby, it is possible to shorten the time until the shared screen is displayed.

  However, at this stage, the display processing of the parent device 10 and the child device 30 is not synchronized, that is, the screen sharing is not started. However, the final screen at the end of the operation of the base unit 10 can be confirmed immediately, the contents can be confirmed before the start of screen sharing, and the user can perform desired processing smoothly.

  Then, the slave unit 30 transmits a screen sharing start request to the master unit 10 (T6 in FIG. 3). FIG. 2D shows a final screen displayed on the slave unit 30 to which a screen sharing operation has been input, and a screen sharing start request for the master unit 10.

  When the parent device 10 receives a screen sharing start request from the child device 30, the parent device 10 and the child device 30 start a screen sharing operation (T7 in FIG. 3). In this screen sharing operation, when the screen sharing communication protocol unit 12 creates screen sharing data in accordance with an operation by the operation unit 14 or the like, the base unit 10 sends the screen sharing data to the slave unit 30 via the communication unit 13. To the side.

  When receiving the shared screen data via the communication unit 31, the slave unit 30 causes the display unit 36 to display the shared screen via the screen sharing communication protocol unit 32.

  On the contrary, when the slave unit 30 creates operation information (mouse coordinate information, keyboard keystroke information, etc.) in the screen sharing communication protocol unit 32 according to the operation by the operation unit 33, the operation information is transmitted via the communication unit 31. Is transmitted to the base unit 10 side. Such operation information is also referred to as shared screen data.

  When the base unit 10 receives the operation information via the communication unit 13, the display unit 11 displays the shared screen via the screen sharing communication protocol unit 12. At this time, the screen sharing communication protocol unit 12 emulates the movement of the mouse, the keystroke of the keyboard, and the like based on the operation information, and the display unit 11 updates the screen. The updated screen is displayed on the parent device 10 and is also transmitted to the child device 30, and the same screen as that of the parent device 10 updated by the child device 30 is displayed. FIG. 2E shows the screens of the parent device 10 and the child device 30 in the screen sharing state.

  As described above, the base unit 10 transmits the information on the final screen displayed on the display unit 11 at the end of the operation of the operation unit 14 to the slave unit 30 by the communication unit 13.

  In the slave unit 30, the communication unit 31 receives information on the final screen when the operation in the master unit 10 ends. The final screen recording unit 35 as a storage unit stores the received information on the final screen. The screen sharing operation unit 33a as the screen sharing start instruction unit instructs the start of screen sharing with the parent device 10. When the display unit 36 is instructed to start screen sharing, the display unit 36 displays the final screen stored in the storage unit.

  Thereby, it is possible to shorten the time until the parent device 10 and the child device 30 are in the screen sharing state.

  Further, in the slave unit 30, the screen sharing communication protocol unit 32 as a screen sharing processing unit starts screen sharing after the final screen is displayed on the display unit 36.

  Accordingly, the user can quickly confirm the final display content by confirming the final screen.

  FIG. 4 is a sequence diagram illustrating an example of a procedure up to the screen sharing state when the parent device 10 transitions to the sleep state. About the same procedure as FIG. 3, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The base unit 10 transmits the data of the final screen to the slave unit 30 in step T2, and then transitions to the sleep state by the power management unit 17 (T3A).

  When detecting the screen sharing operation in step T4, the slave unit 30 displays the final screen on the display unit 36 in step T5 and causes the master unit 10 to transition the master unit 10 from the sleep state to the active state in which it can operate. Resume request (resume request) for transmission is transmitted by the communication unit 31 (T5A). When receiving the resume request from the child device 30, the parent device 10 makes a transition from the sleep state to the active state by the power management unit 17 (T5B).

  Here, the subunit | mobile_unit 30 may recognize beforehand that the main | base station 10 is in a sleep state, and does not need to recognize.

  As shown in FIG. 4, when the parent device 10 does not recognize that it is in the sleep state, the child device 30 always makes a resume request in step T5A when instructed to share the screen. When receiving the resume request, base unit 10 transitions to the active state if it is in the sleep state, and discards the resume request if it is in the active state.

  Further, immediately before the base unit 10 transitions to the sleep state, the slave unit 30 may be notified of the transition to the sleep state. If the handset 30 detects a screen sharing instruction and receives a notification that the base unit 10 has transitioned to the sleep state, it transmits a resume request to the base unit 10, and if it has not received this notification, Do not send resume request.

  Thereafter, the procedure after procedure T6 is as described above.

  As described above, the power management unit 17 as the state transition unit of the base unit 10 causes the base unit 10 to transition to the sleep state after transmitting the information on the final screen by the communication unit 13.

  Thereby, power saving can be achieved while the final screen is reliably transmitted to the child device 30.

  Also, in the slave unit 30, the communication unit 31 transmits a first resume request for canceling the sleep state of the master unit 10. The screen sharing communication protocol unit 32 as the screen sharing processing unit starts screen sharing after the first resume request is transmitted.

  Thereby, it is possible to perform screen sharing at a timing when the slave device 30 wants to share the screen while reducing the power consumption of the parent device 10.

  In the base unit 10, the communication unit 13 receives the first resume request from the handset 30. The power management unit 17 as a state transition unit cancels the sleep state of the parent device 10 in response to the first resume request. The screen sharing communication protocol unit 12 as the screen sharing processing unit starts screen sharing after the sleep state of the parent device 10 is released.

  Thereby, screen sharing can be performed between the parent device 10 and the child device 30 while reducing the power consumption of the parent device 10. Therefore, even when the parent device 10 is in the sleep state, the time until the parent device 10 is changed to the active state to share the screen and display the shared screen can be shortened.

  FIG. 5 is a sequence diagram illustrating an example of a procedure up to the screen sharing state when the slave unit 30 is in the sleep state. About the same procedure as FIG. 3, the description is abbreviate | omitted by attaching | subjecting the same code | symbol. In addition, the subunit | mobile_unit 30 assumes that it is a sleep state at the time of the process start of FIG.

  When the master unit 10 detects the end of the operation in step T1, it transmits a resume request to the slave unit 30 (T1A). The subunit | mobile_unit 30 will change to an active state, if the resume request | requirement is received from the main | base station 10 (T1B).

  Here, the base unit 10 may or may not recognize in advance that the handset 30 is in the sleep state.

  As shown in FIG. 5, when the slave unit 30 has not recognized that the slave unit 30 is in the sleep state, the master unit 10 always makes a resume request in step T1A when detecting the end of the operation. When receiving the resume request, the slave unit 30 transitions to the active state when in the sleep state, and discards the resume request when in the active state.

  Further, immediately before the slave device 30 transitions to the sleep state, the master device 10 may be notified of the transition to the sleep state. In this case, when the parent device 10 receives the notification that the child device 30 has transitioned to the sleep state when detecting the end of the operation, the parent device 10 transmits a resume request to the child device 30 and has not received this notification. And no resume request is sent.

  Master unit 10 transmits the data of the final screen to slave unit 30 in the active state in step T2. The subunit | mobile_unit 30 receives the data of this last screen, and records the data of the last screen by procedure T3.

  Here, base unit 10 may transmit the data of the final screen at the following timing.

  The base unit 10 may transmit the data of the final screen to the slave unit 30 after waiting for a certain time after transmitting the resume request in the procedure T1A. Alternatively, the master unit 10 may be notified of the transition to the active state, and the final screen data may be transmitted after the master unit 10 receives this notification.

  The subunit | mobile_unit 30 changes to a sleep state, after recording the data of the last screen by procedure T3 (T3B). Thereafter, the procedure after procedure T4 is as described above.

  According to the procedure shown in FIG. 5, even when the slave unit 30 is in the sleep state, the slave unit 30 can be temporarily activated to record the data of the final screen of the master unit 10.

  Thus, after the communication unit 13 transmits the second resume request for canceling the sleep state of the child device 30 to the child device 30, the parent device 10 transmits the information on the final screen.

  Thereby, the information on the final screen can be reliably held in the slave unit 30.

  In the slave unit 30, the communication unit 31 receives the second resume request from the master unit 10. The power management unit 38 as a state transition unit cancels the sleep state of the slave unit 30 in response to the received second resume request. The final screen recording unit 35 as a storage unit stores the received information on the final screen after the sleep state is canceled.

  Thus, even in the sleep state, the information on the final screen can be securely held by canceling the sleep state, and can be used when screen sharing is desired.

  Further, the slave unit 30 transitions to the sleep state again after the power management unit 38 as the state transition unit stores the information of the final screen by the final screen recording unit 35 as the storage unit.

  Thereby, the power saving of the subunit | mobile_unit 30 can be achieved, hold | maintaining the information of the last screen reliably.

  According to the communication system 1 of the present embodiment, when receiving the input of the screen sharing operation, the slave unit 30 immediately displays the final screen that has been recorded on the display unit 36, and thus enters the screen sharing state. Can be shortened.

  In the above embodiment, the case where the entire screen of the parent device 10 and the entire screen of the child device 30 are shared is shown. However, a part of the screen of the parent device 10 and the entire screen of the child device 30 are shared. Also good. FIG. 6 is a diagram illustrating a display example of each screen of the parent device 10 and the child device 30 when a part of the screen of the parent device 10 is shared. Here, a case where three windows 41, 42, 43 are displayed on the screen of the display unit 11 is shown. Of the screen of the display unit 11, only the screen based on the offset coordinate area data on which the window 42 is displayed is displayed on the display unit 36 of the slave unit 30. Further, on the contrary, three windows 41, 42, 43 are displayed on the screen of the display unit 36 of the slave unit 30. Of the screen of the display unit 36, the offset coordinate area in which the window 42 is displayed. Only the screen based on the data may be displayed on the display unit 11 of the parent device 10.

  Accordingly, at the end of the operation of the parent device 10, only the data on the final screen of the window 42 is transmitted to the child device 30. As described above, even when a part of the screen is shared, the time until the screen is shared can be shortened. The same applies to the following embodiments.

  In addition, when transmitting the final screen data in step T2, the base unit 10 determines whether the operation end determination unit 15 determines the end of the operation and determines whether it is necessary to transmit the final screen data. Also good.

  For example, if the final screen is a screen used in applications such as document creation, graphic creation, image editing, etc., it is determined that transmission is necessary, while if the final screen is a common screen such as a desktop, Since it is determined that there is no need to transmit, the data of this screen may not be transmitted. At this time, only text data indicating a reason for not transmitting screen data may be transmitted.

  As a result, transmission of data on the final screen that is not required can be omitted, and the communication load can be reduced. The same applies to the following embodiments.

(Second Embodiment)
In the first embodiment, a case where a wireless LAN is used as one communication technology is shown, but in the second embodiment, a case where two communication technologies of a wireless LAN and Bluetooth (registered trademark) are used is shown. . Note that wireless LAN and Bluetooth (registered trademark) are examples of two communication technologies, and other different communication technologies may be used.

  FIG. 7 is a diagram illustrating a configuration example of a communication system 1A according to the second embodiment of the present invention. Communication between the parent device 10 and the child device 30 in the first embodiment is performed by wireless LAN. However, between the parent device 10A and the child device 30A in the second embodiment, the wireless LAN and Bluetooth (registered trademark) are used. The case where communication is performed by both of the above is shown. In general, when a wireless LAN is used, the communication speed is fast, but the power consumption increases. On the other hand, when Bluetooth (registered trademark) is used, the communication speed is slow, but the power consumption is reduced. In addition, about the component same as 1st Embodiment, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  Compared to the parent device 10 of the first embodiment, the parent device 10A includes a first communication unit 13A (an example of a first communication unit) that performs communication using a wireless LAN, and a second communication unit that performs communication using BlueTooth (registered trademark). 13B (an example of a second communication unit), a power management unit 17A, and a restart request communication unit 18A.

  The power management unit 17A manages power ON / OFF of the parent device 10A. In addition, when the power management unit 17A is in the sleep state, only the first communication unit 13A and the second communication unit 13B maintain the operation state and have a resume function for stopping the operations of the other units in the parent device 10A. The power management unit 17A can turn on / off the power of the first communication unit 13A independently.

  The restart request communication unit 18A has the function of the restart request communication unit 18 and receives a communication start request for starting the operation of the first communication unit 13A of the parent device 10A via the second communication unit 13B.

  Compared to the slave unit 30 of the first embodiment, the slave unit 30A includes a first communication unit 31A (an example of a third communication unit) that performs communication using a wireless LAN, and a second communication unit that performs communication using BlueTooth (registered trademark). 31B (an example of a fourth communication unit), a restart request communication unit 37A, and a power management unit 38A are configured.

  The restart request communication unit 37A has the function of the restart request communication unit 37 and transmits a communication start request for starting the operation of the first communication unit 13A of the parent device 10A via the second communication unit 31B.

  The power management unit 38A manages power ON / OFF of the slave unit 30A. Further, when in the sleep state, the power management unit 38A has a resume function (Wake_on_LAN or the like) that maintains the operation state of only the second communication unit 31B and stops the operation of other units in the slave unit 30A. Further, the power management unit 38A can turn on / off the power of the first communication unit 31A independently.

  Next, an operation example up to the screen sharing state of the communication system 1A will be described.

  FIG. 8 is a sequence diagram illustrating an example of a procedure up to the screen sharing state when the parent device 10A transitions to the sleep state using two communication technologies. Even when the parent device 10A is in the sleep state, the second communication unit 13B of the parent device 10A is in the operating state (communication enabled state).

  When the operation end determination unit 15 detects the operation end (T11), the base unit 10A sends the data of the final screen at the end of the operation to the slave unit 30A by the final screen transmission unit 16 via the first communication unit 13A. Transmit (T12). The data of this final screen is data composed of, for example, a bitmap image.

  When the final screen data is received by the final screen receiving unit 34 via the first communication unit 31A from the master unit 10A, the slave unit 30A records the final screen data by the final screen recording unit 35 (T13).

  After transmitting the final screen data, base unit 10A stops the operation of first communication unit 13A and cuts off (stops) the wireless LAN connection (T14). Then, base unit 10A transitions to the sleep state (T15). In this sleep state, only the second communication unit 13B is in an operating state.

  Slave device 30A waits until it detects a screen sharing operation or the like by the user via screen sharing operation unit 33a. When the screen sharing operation is detected (T16), the slave unit 30A reads the data of the final screen recorded in the final screen recording unit 35, and the display unit 36 displays the final screen (T17). Thereby, it is possible to shorten the time until the shared screen is displayed.

  Furthermore, the slave unit 30A transmits a resume request for the master unit 10A to the master unit 10A via the second communication unit 31B (T18).

  Here, handset 30A may or may not recognize in advance that base unit 10A is in the sleep state.

  If the parent device 10A does not recognize that it is in the sleep state, the child device 30A always makes a resume request in step T18 when instructed to share the screen. When receiving the resume request, base unit 10A transitions to the active state if it is in the sleep state, and discards the resume request if it is in the active state.

  Further, immediately before the parent device 10A transitions to the sleep state, the slave device 30A may be notified of the transition to the sleep state. When the slave unit 30A detects the screen sharing instruction, the slave unit 30A transmits a resume request to the master unit 10A when receiving a notification of transition to the sleep state. Do not send.

  When receiving the resume request via the second communication unit 13B, the base unit 10A transitions from the sleep state to the active state (T19). However, at this stage, the operation of the first communication unit 13A is not started.

  Further, the slave unit 30A transmits a communication start request by the first communication unit 13A using the wireless LAN to the master unit 10A via the second communication unit 31B (T20).

  Here, when the communication start request is transmitted, it is assumed that the first communication unit 13A of the parent device 10A is in a stopped state. Slave device 30A can know whether or not first communication unit 13A of master device 10A is in a stopped state by the following method.

  For example, the slave unit 30A attempts to connect to the master unit 10A via the first communication unit 31A, and according to the result, whether or not the first communication unit 13A of the master unit 10A is stopped, that is, communication You may determine whether it is within a range. Alternatively, immediately before the parent device 10A stops the first communication unit 13A, the first communication unit 13A may notify the child device 30A of communication disconnection. Alternatively, immediately before the parent device 10A stops the first communication unit 13A, the communication disconnection may be notified to the child device 30A by the second communication unit 13B.

  Even if the state of the first communication unit 13A is not known, the slave unit 30A transmits a resume request to the master unit 10A, waits for a certain time, and then transmits a communication start request by the first communication unit 13A. May be. Alternatively, the slave unit 30A may transmit a communication start request by the first communication unit 13A after notifying that the slave unit 30A has transitioned to the active state via the second communication unit 13B.

  When receiving the communication start request via the second communication unit 13B, the base unit 10A starts the operation of the first communication unit 13A (T21). That is, the first communication unit 13A is in a communicable state.

  Furthermore, the slave unit 30A transmits a screen sharing start request to the master unit 10A via the first communication unit 31A (T22).

  When the parent device 10A receives the screen sharing start request from the child device 30A, the parent device 10A and the child device 30A start the screen sharing operation (T23).

  In this screen sharing operation, when the screen sharing communication protocol unit 12 creates shared screen data in accordance with an operation by the operation unit 14 or the like, the base unit 10A transmits the shared screen data via the first communication unit 13A. Transmit to the machine 30A side. When the slave unit 30A receives the data of the shared screen via the first communication unit 31A, the display unit 36 displays the shared screen via the screen sharing communication protocol unit 32.

  Conversely, when the screen sharing communication protocol unit 32 creates shared screen data in accordance with an operation by the operation unit 33 or the like, the slave unit 30A transfers the shared screen data to the base unit 10A via the first communication unit 31A. Send. When the base unit 10A receives the data of the shared screen via the first communication unit 13A, the display unit 11 displays the shared screen via the screen sharing communication protocol unit 12.

  In this manner, in the base unit 10A, the first communication unit 13A transmits information on the final screen. The power management unit 17A as the state transition unit performs at least one of the stop of the first communication unit 13A and the transition to the sleep state of the parent device 10A after transmitting the information of the final screen by the first communication unit 13A.

  As a result, by using two communication technologies such as wireless LAN and Bluetooth (registered trademark), the power consumption on the base unit 10A side is reduced, and the high communication speed between the base unit 10A and the slave unit 30A is ensured. can do.

  Moreover, as for the subunit | mobile_unit 30A, the 1st communication part 31A as a 3rd communication part receives the information of the last screen. The second communication unit 31B as the fourth communication unit at least one of the first activation request for activating the first communication unit 13A of the parent device 10 and the first resume request for releasing the sleep state of the parent device 10 Send. The screen sharing communication protocol unit 32 as the screen sharing processing unit starts screen sharing via the first communication unit 31A after the request is transmitted by the first communication unit 31A.

  As a result, even in a communication environment (such as in the case of P2P communication) where resume means by communication such as “Wake_on_WLAN” cannot be used, both the parent device 10 and the child device 30 can wait for communication while transitioning to the sleep state. . For this reason, screen sharing can be performed while reducing power consumption.

  Further, in the base unit 10A, the second communication unit 13B allows the first start request from the slave unit 30A (for example, a communication start request by the first communication unit 13A) and the first resume request (for example, the base unit). 10A resume request) is received. When the first activation request is received by the second communication unit 13B, the power management unit 17A as the state transition unit activates the first communication unit 13A in response to the activation request and receives the first resume request. In the case where it has been done, the sleep state of the parent device 10 is canceled in response to the first resume request. The screen sharing communication protocol unit 12 as the screen sharing processing unit starts screen sharing via the first communication unit 13A after the state transition is performed by the power management unit 17A as the state transition unit.

  Accordingly, even when the first communication unit 13A is stopped or the parent device 10A is in the sleep state, screen sharing can be started without performing an operation on the parent device 10A.

  FIG. 9 is a sequence diagram illustrating an example of a procedure up to the screen sharing state when the slave device 30A transitions to the sleep state using two communication technologies. The same steps as those in FIG. 8 are denoted by the same reference numerals, and description thereof is omitted. Even when the slave unit 30A and the master unit 10A are in the sleep state, the second communication unit 31B of the slave unit 30A and the second communication unit 13B of the master unit 10A are in the operating state (communication possible state). It is assumed that slave unit 30B is in a sleep state at the start of the process of FIG.

  When detecting the end of the operation in step T11, base unit 10A transmits a resume request to slave unit 30A via second communication unit 13B (T11A).

  Here, base unit 10A may recognize in advance that slave unit 30A is in the sleep state, or may not recognize it.

  When the slave unit 30A does not recognize that the slave unit 30A is in the sleep state, the master unit 10A always makes a resume request in step T11A when detecting the end of the operation. When receiving the resume request, slave unit 30A transitions to the active state if it is in the sleep state, and discards the resume request if it is in the active state.

  Further, immediately before the slave device 30A transitions to the sleep state, the master device 10A may be notified of the transition to the sleep state. When base unit 10A detects the end of operation and has received a notification that slave unit 30A has transitioned to the sleep state, it transmits a resume request to slave unit 30A. Do not send the request.

  When receiving the resume request via the second communication unit 31B, the slave unit 30A transitions from the sleep state to the active state (T11B).

  When the slave unit 30A enters the active state, the slave unit 30A starts the operation of the first communication unit 31A (T11C). Then, base unit 10A transmits the data of the final screen to slave unit 30A via first communication unit 13A in step T12.

  Here, base unit 10A may transmit the data of the final screen at the following timing. The master unit 10A may transmit the final screen data to the slave unit 30A after waiting for a certain time after transmitting the resume request in step T11A. Further, the master unit 10A may notify the master unit 10A that the slave unit 30A has transitioned to the active state, and the master unit 10A may transmit the final screen data after receiving this notification.

  The slave unit 30A records the data of the final screen from the master unit 10A in step T13, stops the operation of the first communication unit 31A (T13A), and transitions to the sleep state (T13B). After this, the procedure after procedure T14 is as described above.

  As described above, in the base unit 10A, the second communication unit 13B causes the slave unit 30A to start the second communication request (for example, the first communication unit 31A as the third communication unit of the slave unit 30A). At least one of a second resume request (for example, a resume request of the slave unit 30A) for canceling the sleep state of the slave unit 30A is transmitted. The first communication unit 13A transmits information on the final screen after the request is transmitted by the second communication unit 13B.

  As a result, power can be saved in the slave unit 30A, and the stop state of the first communication unit 31A of the slave unit 30A and the sleep state of the slave unit 30A can be canceled, and the information on the final screen can be reliably held.

  Further, in the slave unit 30A, the second communication unit 31B as the fourth communication unit receives a second activation request for starting the first communication unit 31A as the third communication unit from the master unit 10A and the slave unit 30A. At least one of the second resume requests for releasing the sleep state is received. When the second activation request is received by the second communication unit 31B, the power management unit 38A as the state transition unit activates the first communication unit 31A in response to the second activation request, and the second resume request If received, the sleep state of the slave unit 30A is canceled in response to the second resume request. The final screen recording unit 35 as a storage unit stores information on the final screen received by the first communication unit 31A after the state transition is performed by the power management unit 38A as the state transition unit.

  Thereby, even when the first communication unit 31A of the child device 30A is in the stopped state or when the child device 30A is in the sleep state, the child device 30A is temporarily activated and the final screen of the parent device 10A is displayed. Can be recorded. Thereby, the power consumption at the side of the subunit | mobile_unit 30 can be reduced.

  Further, in the slave unit 30A, the power management unit 38A as the state transition unit causes the final screen recording unit 35 as the storage unit to store the information on the final screen, and then transitions to the sleep state again.

  Thereby, it is possible to save power of the slave unit 30A while reliably retaining information on the final screen.

  According to the second embodiment as described above, the same effect as that of the first embodiment can be obtained. In addition, by using two communication technologies, the power consumption can be reduced and the distance between the parent device 10A and the child device 30A can be reduced. High communication speed can be ensured.

(Third embodiment)
In the first and second embodiments, the case where the parent device and the child device share the screen on a one-to-one basis has been described. However, in the third embodiment, the parent device and the child device have a many-to-one, one-to-one relationship. A case where a screen is shared in many or many-to-many manner is shown.

  First, a case where one slave unit 30 can share a screen with a plurality of master units 10 is shown. FIG. 10 is a sequence diagram showing an example of a procedure until one of the plurality of parent devices 10 (10B, 10C) and one child device 30 (30B) reach the screen sharing state according to the third embodiment of the present invention. is there. About the same procedure as 1st Embodiment, the description is abbreviate | omitted by attaching | subjecting the same code | symbol. In addition, since the configurations of the parent devices 10B and 10C and the child device 30B in the third embodiment are the same as those in the first embodiment, description thereof is omitted. As an example, the case of two master units is shown, but the same applies to three or more master units.

  When base unit 10B detects the end of operation in step T1E, base unit 10B transmits the data of the final screen at the end of the operation and the identification information such as the IP address of base unit 10B that is the transmission source to slave unit 30B via communication unit 13. (T2E).

  When receiving the final screen data and the transmission source IP address from the parent device 10B via the communication unit 31, the slave unit 30B records the final screen data and the transmission source IP address by the final screen recording unit 35 ( T3E).

  Further, when detecting the end of the operation in step T1F, the base unit 10C sends the identification information such as the data of the final screen at the end of the operation and the IP address of the base unit 10C as the transmission source to the slave unit 30B via the communication unit 13. Transmit (T2F).

  When receiving the final screen data and the source IP address from the base unit 10C via the communication unit 31, the slave unit 30B records the final screen data and the source IP address by the final screen recording unit 35 ( T3F).

  FIG. 11 is a diagram illustrating an example of the management table 55. This management table 55 is held in the final screen recording unit 35. In procedures T3E and T3F, the final screen recording unit 35 registers the memory address that is the recording destination of the data of the final screen, the IP address of the transmission source, and the like in the management table 55 as the screen sharing destination.

  In the slave unit 30B, the user selects a specific screen sharing destination from among the plurality of master units 10 registered in the management table 55 using the screen sharing operation unit 33a, and the selected specific screen sharing destination and Wait until a screen sharing operation is detected. Here, as an example, it is assumed that base unit 10B is selected as a screen sharing destination. When the screen sharing operation is detected (T4E), the slave unit 30B reads the IP address of the selected screen sharing destination (final screen transmission source) registered in the management table 55.

  Further, the slave unit 30B reads the data of the final screen recorded in the final screen recording unit 35 based on the memory address registered in the management table 55, and the display unit 36 displays the final screen (T5E).

  Then, slave unit 30B transmits a screen sharing start request to master unit 10B, which is the screen sharing destination selected in step T6.

  When the parent device 10B receives the screen sharing start request from the child device 30B, the parent device 10B and the child device 30B start the screen sharing operation in step T7. This screen sharing operation is the same as in the first embodiment.

  As described above, in the base units 10B and 10C, the communication unit 13 transmits the information on the final screen and the identification information such as the IP addresses of the base units 10B and 10C.

  Thereby, even if there are a plurality of master units 10, the slave unit 30B can share a screen with a desired master unit 10 using the identification information of the master unit 10.

  In the slave unit 30B, the communication unit 31 receives the information on the final screen and the identification information of the master units 10B and 10C. The final screen recording unit 35 as a storage unit stores the information of the final screen received by the communication unit 31 and the identification information of the parent devices 10B and 10C. When instructed to start screen sharing with any of the parent devices 10B and 10C, the display unit 36 is based on the final screen information stored in the storage unit and the identification information of the parent devices 10B and 10C. , Display the final screen.

  As a result, any parent device 10 that desires screen sharing can be selected from among the plurality of parent devices 10, and even if any parent device 10 and child device 30B share the screen, screen sharing is possible. The time until the state is reached can be shortened.

  Here, although the IP address is used as the identification information for associating the source of the received final screen with the screen sharing destination, the present invention is not limited to this. For example, the computer name (alias), the MAC address, and the ESSID (Extended Service Set Identifier) of the parent device 10 that is the transmission source may be used.

  Further, when the screen sharing destination is set, the unique ID specified by the user via the operation unit 14 or the like may be associated by adding as a header when the base unit 10 transmits the data of the final screen.

  Similarly, when setting the screen sharing destination, a UUID (Universally Unique Identifier) generated by a combination of a random number and a time may be associated by adding it as a header when the base unit 10 transmits the final screen data. Good.

  Although the procedure corresponding to FIG. 3 is shown here, the procedure corresponding to FIGS. 4, 5, 8, and 9 is the same.

  Next, a case where one parent device 10 can share a screen with a plurality of child devices 30 will be described. Also in this case, it is necessary to associate the transmission source of the final screen with the screen sharing destination. The base unit 10 transmits the data of the final screen as described below, so that each handset 30 can associate the transmission source of the final screen with the screen sharing destination.

  FIG. 12 is a sequence diagram showing an example of a procedure until one master unit 10 (10D) reaches a screen sharing state with a plurality of slave units 30 (30C, 30D). The same procedures as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Moreover, since the structure of the main | base station 10D and the subunit | mobile_unit 30C, 30D in 3rd Embodiment is the same as that of the said 1st Embodiment, the description is abbreviate | omitted. In addition, although the case of two subunit | mobile_units is shown as an example, it is the same also in three or more.

  When the operation end determination unit 15 detects the operation end (T1G), the base unit 10D receives the final screen data at the end of the operation by the final screen transmission unit 16 via the communication unit 13 for the slave units 30C and 30D. Transmit (T2G, T2H).

  When receiving the final screen data by the final screen receiving unit 34 from the master unit 10D via the communication unit 31, the slave units 30C and 30D record the final screen data by the final screen recording unit 35 (T3G, T3H). ).

  The slave units 30C and 30D stand by until they detect a screen sharing operation or the like by the user via the screen sharing operation unit 33a. When the screen sharing operation is detected (T4G, T4H), the slave units 30C, 30D respectively read the final screen data recorded in the final screen recording unit 35, and the display unit 36 displays the final screen (T5G, T5H). ). Thereby, it is possible to shorten the time until the shared screen is displayed.

  Then, the slave units 30C and 30D transmit a screen sharing start request to the master unit 10D (T6G and T6H). When the parent device 10D receives a screen sharing start request from the child devices 30C and 30D, the parent device 10 and the child devices 30C and 30D start a screen sharing operation (T7G and T7H).

  In this way, the parent device 10D transmits the data of the final screen to, for example, all the child devices 30C and 30D. In this case, all the slave units 30C and 30D can share the screen simultaneously with the master unit 10D that is the transmission source of the final screen.

  When transmitting the final screen data, master device 10D may transmit the final screen data only to the slave device 30 that has finally shared the screen. In this case, only the handset 30 that has performed screen sharing last time can perform screen sharing again.

  Similarly, base unit 10D may transmit the data of the final screen only to slave unit 30 with the largest number of screen sharing times.

  Further, base unit 10D may transmit the data of the final screen only to a plurality of slave units 30 that have recently performed screen sharing. In this case, only the plurality of slave units 30 that have recently performed screen sharing can perform screen sharing again.

  Similarly, base unit 10D may transmit the data of the final screen only to the top several slave units 30 that have a large number of screen sharing times.

  Further, base unit 10D sets in advance a screen sharing target handset 30 for each user ID registered in advance, and only for handset 30 corresponding to the user ID being operated in base unit 10D. The final screen data may be transmitted.

  Similarly, the parent device 10D sets a screen sharing target child device 30 in advance for each application registered in advance, and only for the child device 30 corresponding to the application being operated in the parent device 10D, The final screen data may be transmitted.

  Although the procedure corresponding to FIG. 3 is shown here, the procedure corresponding to FIGS. 4, 5, 8, and 9 is the same.

  As described above, in the parent device 10D, the communication unit 13 transmits information on the final screen to the plurality of child devices 30C and 30D. The screen sharing communication protocol unit 12 as the screen sharing processing unit performs screen sharing with the plurality of slave units 30C and 30D. As a result, the parent device 10D and the plurality of child devices 30C and 30D can simultaneously share the screen.

Next, a case where a plurality of master units 10 can share a screen with a plurality of slave units 30 will be described.
In the communication system 1 that performs such screen sharing, the above-described procedure in which one slave unit 30 performs screen sharing with a plurality of master units 10, and one master unit 10 has a plurality of slave units 30 and screens. This is realized by combining the procedure for sharing.

  According to the third embodiment, even when the parent device 10 and the child device 30 share the screen in a many-to-one, one-to-many, or many-to-many manner, the time until the screen sharing state is established. It can be shortened.

  The present invention is not limited to the configuration of the above-described embodiment, and any configuration can be used as long as the functions shown in the claims or the functions of the configuration of the present embodiment can be achieved. Is also applicable.

  For example, in each of the above embodiments, the case where the screen sharing operation is performed from the slave unit side is shown, but the screen sharing operation may be performed from the master unit side.

  Moreover, in the said embodiment, not only a smart phone, a notebook PC, a tablet terminal etc. as an electronic device which is a communication apparatus, but this invention is applied to the various electronic devices which can communicate.

  Moreover, although the case where a plurality of communication devices are connected wirelessly has been described in the above embodiment, it is needless to say that they may be connected by wire.

  The present invention also provides a program for supplying a communication program for realizing the functions of the above-described embodiment to a parent device or a child device via a network or various storage media, and reading and executing the computer in the parent device or the child device. Scope of application.

  INDUSTRIAL APPLICABILITY The present invention is useful for a communication device, a communication method, a communication program, and the like that can shorten the time until a screen sharing state is achieved.

1, 1A communication system 10, 10A, 10B, 10C, 10D parent device 11 display unit 12, 32 screen sharing communication protocol unit 13, 31 communication unit 13A, 31A first communication unit 13B, 31B second communication unit 14, 33 operation Unit 15 Operation end determination unit 16 Final screen transmission unit 17, 17A, 38, 38A Power management unit 18, 18A, 37, 37A Resume request communication unit 30, 30A, 30B, 30C, 30D Slave unit 33a Screen sharing operation unit 34 Final Screen receiving unit 35 Final screen recording unit 36 Display unit 41, 42, 43 Window 55 Management table

Claims (23)

A communication device that shares a screen with other communication devices,
A display for displaying information on the screen;
An operation unit for receiving an operation;
A communication unit that transmits information on the final screen displayed on the display unit at the time of completion of the operation by the operation unit to the other communication device;
A communication device comprising: The communication device according to claim 1, further comprising:
A communication apparatus comprising: a state transition unit configured to transition the communication apparatus to a sleep state after transmitting information on the final screen by the communication unit. The communication device according to claim 2, further comprising:
A screen sharing processing unit that performs screen sharing between the communication device and the other communication device,
The communication unit receives a first resume request for canceling the sleep state of the communication device from the other communication device;
In response to the first resume request from the other communication device, the state transition unit cancels the sleep state of the communication device,
The screen sharing processing unit starts the screen sharing after the sleep state of the communication device is canceled by the state transition unit. The communication device according to any one of claims 1 to 3,
The communication unit transmits information on the final screen after transmitting a second resume request for releasing the sleep state of the other communication device to the other communication device. The communication device according to claim 1,
A state transition unit for performing state transition of the communication device;
The communication unit includes a first communication unit and a second communication unit,
The first communication unit transmits information on the final screen,
The state transition unit is a communication device that performs at least one of stoppage of the first communication unit and transition of the communication device to a sleep state after the information on the final screen is transmitted by the first communication unit. The communication device according to claim 5,
A screen sharing processing unit that performs screen sharing between the communication device and the other communication device,
The second communication unit receives at least one of a first activation request for activating the first communication unit from the other communication device and a first resume request for releasing the sleep state of the communication device. Receive
When the first activation request is received by the second communication unit, the state transition unit activates the first communication unit in response to the activation request, and the second communication unit activates the first resume. When the request is received, the sleep state of the communication device is canceled according to the first resume request,
The screen sharing processing unit is a communication device that starts the screen sharing via the first communication unit after the state transition is performed by the state transition unit. The communication device according to claim 5 or 6, wherein
The second communication unit causes the other communication device to request a second activation for activating the third communication unit of the other communication device, and a second for releasing the sleep state of the other communication device. Send at least one of the two resume requests,
The first communication unit is a communication device that transmits information on the final screen after a request is transmitted by the second communication unit. The communication device according to any one of claims 1 to 7,
The communication unit is a communication device that transmits information on the final screen and identification information of the communication device. The communication device according to any one of claims 1 to 8,
A screen sharing processing unit that performs screen sharing between the communication device and the other communication device,
The communication unit transmits information on the final screen to a plurality of other communication devices,
The screen sharing processing unit is a communication device that performs the screen sharing with the plurality of other communication devices. A communication device that shares a screen with other communication devices,
A communication unit for receiving information on a final screen at the time of completion of operation in the other communication device;
A storage unit for storing information of a final screen received by the communication unit;
A screen sharing start instruction unit for instructing start of screen sharing with the other communication device;
When the start of screen sharing is instructed by the screen sharing start instruction unit, a display unit that displays the final screen stored by the storage unit;
A communication device comprising: The communication device according to claim 10,
A screen sharing processing unit that performs screen sharing between the communication device and the other communication device,
The screen sharing processing unit starts the screen sharing after the final screen is displayed by the display unit. The communication device according to claim 11,
The communication unit transmits a first resume request for releasing the sleep state of the other communication device,
The screen sharing processing unit is a communication device that starts the screen sharing after the first resume request is transmitted by the communication unit. The communication device according to any one of claims 10 to 12,
A state transition unit for performing state transition of the communication device;
The communication unit receives a second resume request for canceling the sleep state of the communication device,
The state transition unit releases the sleep state in response to the second resume request received by the communication unit,
The storage device is a communication device that stores information on the final screen received by the receiving unit after the sleep state is canceled. The communication device according to claim 13,
The state transition unit is a communication device that transitions to the sleep state again after the information on the final screen is stored in the storage unit. The communication device according to claim 9,
A screen sharing processing unit that performs screen sharing between the communication device and the other communication device,
The communication unit includes a third communication unit and a fourth communication unit,
The third communication unit receives the information on the final screen,
The fourth communication unit transmits at least one of a first activation request for activating the first communication unit of the other communication device and a first resume request for releasing the sleep state of the other communication device. ,
The screen sharing processing unit is a communication device that starts the screen sharing via the first communication unit after a request is transmitted by the third communication unit. The communication device according to claim 15, further comprising:
A state transition unit for performing state transition of the communication device;
The fourth communication unit receives at least one of a second activation request for activating the third communication unit and a second resume request for releasing the sleep state of the communication device from the other communication device. ,
When the second activation request is received by the fourth communication unit, the state transition unit activates the third communication unit in response to the second activation request, and the fourth communication unit activates the third communication unit. When the 2 resume request is received, the sleep state of the communication device is canceled according to the second resume request,
The storage device stores information on the final screen received by the third communication unit after the state transition is performed by the state transition unit. The communication device according to claim 16, wherein
The state transition unit is a communication device that transitions to the sleep state again after the information on the final screen is stored in the storage unit. The communication device according to any one of claims 1 to 7,
The communication unit receives the information of the final screen and the identification information of the other communication device,
The storage unit stores the information of the final screen received by the communication unit and the identification information of the other communication device,
The display unit displays the final screen based on the identification information of the other communication device stored by the storage unit when the screen sharing start instruction unit instructs the start of screen sharing. . A communication system for sharing a screen between a first communication device and a second communication device,
The first communication device is
A first display for displaying information on the screen;
An operation unit for receiving an operation;
A transmission unit that transmits information on the final screen displayed on the first display unit to the second communication device at the end of the operation by the operation unit;
With
The second communication device is
A receiving unit for receiving information on the final screen transmitted by the transmitting unit of the first communication device;
A storage unit for storing information of a final screen received by the reception unit;
A screen sharing start instruction unit for instructing start of screen sharing with the first communication device;
A second display unit that displays a final screen stored by the storage unit when the screen sharing start instruction unit instructs the start of screen sharing;
A communication system comprising: A communication method in a communication device for sharing a screen with another communication device,
A communication method including a step of transmitting, to the other communication device, information on a final screen displayed on a display unit that displays information on a screen when an operation by an operation unit that receives an operation is completed. A communication method in a communication device for sharing a screen with another communication device,
Receiving information on a final screen at the end of operation in the other communication device;
Storing the received information of the final screen in a storage unit;
Instructing the start of screen sharing with the other communication device;
When starting to share the screen is instructed, displaying a final screen stored by the storage unit on a display unit;
A communication method comprising:   A communication program for causing a computer to execute each step of the communication method according to claim 20.   A communication program for causing a computer to execute each step of the communication method according to claim 21.

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