A communication terminal for requesting a communication management system that relays image data transmitted from another communication terminal (3a, 7, 9) to control resolution of the transmitted image data, the communication terminal comprising: required resolution management means (3004d, 302, 303, 304) for storing, for each of a plurality of image types, a display size of each of a plurality of display areas divided from an entire area displayable by a display, in association with required resolutions of image data to be displayed in the corresponding display areas, wherein said display size corresponding to a number of pixels in the horizontal and vertical directions; said required resolution corresponding to a number of pixels in the horizontal and vertical directions; the image types including a planar image and a full spherical panoramic image; and the communication terminal further comprising: receiving means (31d, 301, 311) for receiving, from the communication management system, specific image type information indicating a type of specific image data transmitted from the other communication terminal (3a, 7, 9); transmitting means (31d, 301, 311) for transmitting, to the communication management system, specific required resolution, which is a resolution stored by the required resolution management means (3004d, 302, 303, 304), for the specific image type information, in association with the size of one of the display areas in which the specific image data is to be displayed; generating means (33d, 301) for generating data of a planar image being an image of a partial area of a full spherical panoramic image based on the specific image data transmitted from the other communication terminal (3a, 7, 9), in a case in which the specific image type information indicates that the type of the specific image data is a full spherical panoramic image; wherein for the same display size, the stored required resolution for a full spherical panoramic image is higher than the stored required resolution for a planar image; display control means for controlling the display to display the generated planar image in the display area associated with the transmitted specific required resolution. required resolution management means (3004d, 302, 303, 304) for storing, for each of a plurality of image types, a display size of each of a plurality of display areas divided from an entire area displayable by a display, in association with required resolutions of image data to be displayed in the corresponding display areas, wherein said display size corresponding to a number of pixels in the horizontal and vertical directions; said required resolution corresponding to a number of pixels in the horizontal and vertical directions; the image types including a planar image and a full spherical panoramic image; and the communication terminal further comprising: receiving means (31d, 301, 311) for receiving, from the communication management system, specific image type information indicating a type of specific image data transmitted from the other communication terminal (3a, 7, 9); transmitting means (31d, 301, 311) for transmitting, to the communication management system, specific required resolution, which is a resolution stored by the required resolution management means (3004d, 302, 303, 304), for the specific image type information, in association with the size of one of the display areas in which the specific image data is to be displayed; generating means (33d, 301) for generating data of a planar image being an image of a partial area of a full spherical panoramic image based on the specific image data transmitted from the other communication terminal (3a, 7, 9), in a case in which the specific image type information indicates that the type of the specific image data is a full spherical panoramic image; wherein for the same display size, the stored required resolution for a full spherical panoramic image is higher than the stored required resolution for a planar image; display control means for controlling the display to display the generated planar image in the display area associated with the transmitted specific required resolution. receiving means (31d, 301, 311) for receiving, from the communication management system, specific image type information indicating a type of specific image data transmitted from the other communication terminal (3a, 7, 9); transmitting means (31d, 301, 311) for transmitting, to the communication management system, specific required resolution, which is a resolution stored by the required resolution management means (3004d, 302, 303, 304), for the specific image type information, in association with the size of one of the display areas in which the specific image data is to be displayed; generating means (33d, 301) for generating data of a planar image being an image of a partial area of a full spherical panoramic image based on the specific image data transmitted from the other communication terminal (3a, 7, 9), in a case in which the specific image type information indicates that the type of the specific image data is a full spherical panoramic image; wherein for the same display size, the stored required resolution for a full spherical panoramic image is higher than the stored required resolution for a planar image; display control means for controlling the display to display the generated planar image in the display area associated with the transmitted specific required resolution.