An information processing device comprising: a display device; and circuitry configured to: receive request information from another information processing device of a plurality of information processing devices, wherein the request information corresponds to a request to display image information on the information processing device; transmit displayable area information to the other information processing device based on the received request information, wherein the displayable area information indicates at least one display position in a specific display area of the display device, and wherein the image information is displayable on the at least one display position; receive display position designation information from the other information processing device, wherein the display position designation information is based on the transmitted displayable area information, and wherein the display position designation information indicates a display position of the at least one display position; control, based on the received display position designation information, the display device to display a window in the specific display area of the display device at the display position; receive a use state determined by the other information processing device, wherein the use state of the other information processing device includes at least one of a vertical placement, a horizontal placement, or an oblique placement of the other information processing device; determine a display state of the window based on the use state of the other information processing device; control the display device to display the window based on the display state; and control reception of the image information from the other information processing device. a display device; and circuitry configured to: receive request information from another information processing device of a plurality of information processing devices, wherein the request information corresponds to a request to display image information on the information processing device; transmit displayable area information to the other information processing device based on the received request information, wherein the displayable area information indicates at least one display position in a specific display area of the display device, and wherein the image information is displayable on the at least one display position; receive display position designation information from the other information processing device, wherein the display position designation information is based on the transmitted displayable area information, and wherein the display position designation information indicates a display position of the at least one display position; control, based on the received display position designation information, the display device to display a window in the specific display area of the display device at the display position; receive a use state determined by the other information processing device, wherein the use state of the other information processing device includes at least one of a vertical placement, a horizontal placement, or an oblique placement of the other information processing device; determine a display state of the window based on the use state of the other information processing device; control the display device to display the window based on the display state; and control reception of the image information from the other information processing device. receive request information from another information processing device of a plurality of information processing devices, wherein the request information corresponds to a request to display image information on the information processing device; transmit displayable area information to the other information processing device based on the received request information, wherein the displayable area information indicates at least one display position in a specific display area of the display device, and wherein the image information is displayable on the at least one display position; receive display position designation information from the other information processing device, wherein the display position designation information is based on the transmitted displayable area information, and wherein the display position designation information indicates a display position of the at least one display position; control, based on the received display position designation information, the display device to display a window in the specific display area of the display device at the display position; receive a use state determined by the other information processing device, wherein the use state of the other information processing device includes at least one of a vertical placement, a horizontal placement, or an oblique placement of the other information processing device; determine a display state of the window based on the use state of the other information processing device; control the display device to display the window based on the display state; and control reception of the image information from the other information processing device.