An image transmission apparatus comprising: a detection circuitry configured to detect an overlap region in a captured image that is shared by two or more regions of interest based on a plurality of pieces of positional information that defines the two or more regions of interest in the captured image, wherein positional information associated with each of the two or more regions of interest includes coordinates of a predetermined position in each of the two or more regions of interest and size information of each of the two or more regions of interest, and wherein to detect the overlap region, the detection circuitry is configured to extract two or more sub-images corresponding to the two or more regions of interest from the captured image, determine the plurality of pieces of positional information from the two or more sub-images that are extracted, and detect the overlap region by deriving the overlap region from the plurality of pieces of positional information; a generation circuitry configured to generate a first image based on a first piece of positional information from the plurality of pieces of positional information, the first image including the overlap region, and the first image corresponding to a first region of interest of the two or more regions of interest, generate one or more second images based on the overlap region and the plurality of pieces of positional information, the one or more second images are generated by excluding the overlap region from regions of interest other than the first region of interest of the two or more regions of interest, and the one or more second images corresponding to the regions of interest other than the first region of interest of the two or more regions of interest, and generate transmission data including a frame including a header region, the header region including the plurality of pieces of positional information, and the frame including a packet region, the packet region including the first image and the one or more second images associated with corresponding ones of the plurality of pieces of positional information, and to separate and arrange, in the packet region of the frame, each of the one or more second images for each predetermined area of the one or more second images, wherein the each predetermined area is based on a corresponding one of the plurality of pieces of positional information; and a transmission circuitry configured to output the transmission data. a detection circuitry configured to detect an overlap region in a captured image that is shared by two or more regions of interest based on a plurality of pieces of positional information that defines the two or more regions of interest in the captured image, wherein positional information associated with each of the two or more regions of interest includes coordinates of a predetermined position in each of the two or more regions of interest and size information of each of the two or more regions of interest, and wherein to detect the overlap region, the detection circuitry is configured to extract two or more sub-images corresponding to the two or more regions of interest from the captured image, determine the plurality of pieces of positional information from the two or more sub-images that are extracted, and detect the overlap region by deriving the overlap region from the plurality of pieces of positional information; a generation circuitry configured to generate a first image based on a first piece of positional information from the plurality of pieces of positional information, the first image including the overlap region, and the first image corresponding to a first region of interest of the two or more regions of interest, generate one or more second images based on the overlap region and the plurality of pieces of positional information, the one or more second images are generated by excluding the overlap region from regions of interest other than the first region of interest of the two or more regions of interest, and the one or more second images corresponding to the regions of interest other than the first region of interest of the two or more regions of interest, and generate transmission data including a frame including a header region, the header region including the plurality of pieces of positional information, and the frame including a packet region, the packet region including the first image and the one or more second images associated with corresponding ones of the plurality of pieces of positional information, and to separate and arrange, in the packet region of the frame, each of the one or more second images for each predetermined area of the one or more second images, wherein the each predetermined area is based on a corresponding one of the plurality of pieces of positional information; and a transmission circuitry configured to output the transmission data.