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An image signal generating apparatus, method, program and storage medium for causing display units to display individual images. The apparatus includes a signal generator, an indexer adding an index signal, and a pointer controller controlling addition or non-addition of a pointer signal. The appara

An image signal generating apparatus, method, program and storage medium for causing display units to display individual images. The apparatus includes a signal generator, an indexer adding an index signal, and a pointer controller controlling addition or non-addition of a pointer signal. The apparatus also includes an output circuit transmitting the image signal, thereby causing the display unit having identification data corresponding to the index signal to display an image, and a central controller controlling in such a way that the pointer signal is not added to the image signal during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame.

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1. An image signal generating apparatus which transmits an image signal to a plurality of display units each having identification data, comprising:an image signal generator which sequentially generates an image signal for each frame that is an image signal for displaying one page image in one frame

1. An image signal generating apparatus which transmits an image signal to a plurality of display units each having identification data, comprising:an image signal generator which sequentially generates an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units;an indexer which adds an index signal to the image signal for each frame;a pointer controller which controls addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units;an image signal output circuit which sequentially transmits the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame; anda central controller which controls the pointer controller in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame. 2. The image signal generating apparatus according to claim 1, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the first time point to the second time point. 3. An image signal generating apparatus which transmits an image signal to a plurality of display units each having identification data, comprising:an image signal generator which sequentially generates an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units;an indexer which adds an index signal to the image signal for each frame;a pointer controller which controls addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units;an image signal output circuit which sequentially transmits the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame; anda central controller which controls the indexer and the pointer controller;wherein the central controller controls the indexer in such a way that the index signal is changed to an invalid index signal corresponding to none of the identification data of the plurality of display units during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame; andwherein the central controller controls the pointer controller in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a third time point that is at least one frame period previous to the first time point. 4. The image signal generating apparatus according to claim 3, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the third time point to the second time point. 5. The image signal generating apparatus according to claim 3 , wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the third time point to the first time point. 6. An image signal generating method for transmitting an image signal to a plurality of display units each having identification data, comprising:sequentially generating an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units;adding an index signal to the image signal for each frame;controlling addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units;sequentially transmitting the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame; andcontrolling the pointer controller in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame. 7. The image signal generating method according to claim 6, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the first time point to the second time point. 8. An image signal generating method for transmitting an image signal to a plurality of display units each having identification data, comprising:sequentially generating an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units;adding an index signal to the image signal for each frame;controlling addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units;sequentially transmitting the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame;controlling the indexer in such a way that the index signal is changed to an invalid index signal corresponding to none of the identification data of the plurality of display units during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame; andcontrolling the pointer controller in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a third time point that is at least one frame period previous to the first time point. 9. The image signal generating method according to claim 8, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the third time point to the second time point. 10. The image signal generating method according to claim 8, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the third time point to the first time point. 11. A computer-readable information storage medium which contains a program for causing a computer system to perform an image signal processing, wherein the computer system transmit s an image signal to a plurality of display units each having identification data, and the computer system includes an image signal generator which sequentially generates an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units;the image signal processing comprising:adding an index signal to the image signal for each frame;controlling addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units;sequentially transmitting the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame; andcontrolling in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame. 12. The computer-readable information storage medium according to claim 11, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the first time point to the second time point. 13. A computer-readable information storage medium which contains a program for causing a computer system to perform an image signal processing, wherein the computer system transmits an image signal to a plurality of display units each having identification data, and the computer system includes an image signal generator which sequentially generates an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units;the image signal processing comprising:adding an index signal to the image signal for each frame;controlling addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units;sequentially transmitting the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame;controlling in such a way that the index signal is changed to an invalid index signal corresponding to none of the identification data of the plurality of display units during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame; andcontrolling in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a third time point that is at least one frame period previous to the first time point. 14. The computer-readable information storage medium according to claim 13, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the third time point to the second time point. 15. The computer-readable information storage medium according to claim 13, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the third time point to the first time point. 16. A program for causing a com puter system to perform an image signal processing, wherein the computer system transmits an image signal to a plurality of display units each having identification data, and the computer system includes an image signal generator which sequentially generates an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units;the image signal processing comprising:adding an index signal to the image signal for each frame;controlling addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units;sequentially transmitting the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame; andcontrolling in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame. 17. The program according to claim 16, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the first time point to the second time point. 18. A program for causing a computer system to perform an image signal processing, wherein the computer system transmits an image signal to a plurality of display units each having identification data, and the computer system includes an image signal generator which sequentially generates an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units;the image signal processing comprising:adding an index signal to the image signal for each frame;controlling addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units;sequentially transmitting the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame;controlling in such a way that the index signal is changed to an invalid index signal corresponding to none of the identification data of the plurality of display units during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame; andcontrolling in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a third time point that is at least one frame period previous to the first time point. 19. The program according to claim 18, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the third time point to the second time point. 20. The program according to claim 18, wherein a period of time during which the pointer signal is not added to the image signal for each frame is from the third time point to the first time point.