Abstract: A transmission range determination unit of a video distribution device receives information about a display position for a video gallery display screen from a terminal device and determines, according to the received information, a transmission range for video gallery data in which display images of video data items are arranged, to be a size greater than a possible display range of the terminal device. A video gallery display screen generation unit generates the video gallery display screen in which the display images of the video data items included in the transmission range determined by the transmission range determination unit are arranged according to an arrangement of the display images of the video data items which is defined by the video gallery data, wherein the video gallery display screen generation unit distributes the generated video gallery display screen to the terminal device.

Abstract: A terminal device includes a reception unit that receives from a video distribution device, a video gallery display Screen in which display images of Video data items transmitted from transmission Source devices are arranged by group, a display unit that has a display region to display a part of the video gallery display Screen; and a control unit that controls the display of the display unit wherein according to an instruction to designate a display target region in the Video gallery display Screen, the control unit changes the number of the display images of the video data items displayed in the display range in the video gallery display Screen, and according to the number of the display images displayed in the display range, the control unit changes difference among groups in a degree of identification display which is determined for each group so as to identify the group.

Abstract: A transmission range determination unit of a video distribution device receives information about a display position for a video gallery display screen from a terminal device and determines, according to the received information, a transmission range for video gallery data in which display images of video data items are arranged, to be a size greater than a possible display range of the terminal device. A video gallery display screen generation unit generates the video gallery display screen in which the display images of the video data items included in the transmission range determined by the transmission range determination unit are arranged according to an arrangement of the display images of the video data items which is defined by the video gallery data, wherein the video gallery display screen generation unit distributes the generated video gallery display screen to the terminal device.

Abstract: A terminal device includes a reception unit that receives from a video distribution device, a video gallery display Screen in which display images of Video data items transmitted from transmission Source devices are arranged by group, a display unit that has a display region to display a part of the video gallery display Screen; and a control unit that controls the display of the display unit wherein according to an instruction to designate a display target region in the Video gallery display Screen, the control unit changes the number of the display images of the video data items displayed in the display range in the video gallery display Screen, and according to the number of the display images displayed in the display range, the control unit changes difference among groups in a degree of identification display which is determined for each group so as to identify the group.

Abstract: A reception unit of a terminal device receives a video gallery display screen in which display images of video data items are arranged, where the video gallery display screen has a screen range greater than a display size of a display unit. A gallery display control unit that makes the display unit display a partial region of the video gallery display screen received by the reception unit, as a display range of the display unit, and information which indicates that there is a displayable region outside the display range. The gallery display control unit moves the display range in the video gallery display screen according to a display movement operation.