1. An imaging terminal comprising: an imaging unit which sequentially outputs original image data into which a light flux incident on an imaging area has been photoelectrically converted in a frame; an image processing unit which generates image data of a first image size from the original image data of a portion corresponding to a first area within the imaging area, and generates image data of a second image size from the original image data of a portion corresponding to a second area as a partial area within the first area; an extraction unit which extracts a part from the image data of the first image size and the image data of the second image size generated by the image processing unit in the frame; and an external interface which wirelessly sequentially transmits the image data of the first image size and the image data of the second image size extracted by the extraction unit.