1. A photographing apparatus comprising: a plurality of light-emitting devices for emitting illumination light having characteristics of spectroscopic distributions varied in at least a visible light range; an image pick-up optical system which forms a subject image of a subject illuminated by the light-emitting devices; an image pick-up device unit which picks-up the subject image formed by the image pick-up optical system and outputs an image signal; and a control unit which controls the photographing apparatus to capture images in one of a spectroscopic image capturing mode and a moving image capturing mode, selectively, wherein in the spectroscopic image capturing mode, the control unit controls the plurality of light-emitting devices, which are selected according to the characteristics of the spectroscopic distributions of the light emitting devices, to sequentially light-on, and the control unit controls the image pick-up device unit to capture sequential spectroscopic still images of the subject simultaneously with the sequential lighting-on of the light-emitting devices; and wherein in the moving image capture mode, the control unit one of: controls a single specific primary color or a plurality of specific primary colors of the light-emitting devices selected from the plurality of light emitting devices to sequentially or simultaneously light-on, and controls the image pick-up device unit to capture a moving image while the specific primary color of the light-emitting devices are lighted-on, and controls a plurality of groups of the light-emitting devices to sequentially light-on group by group, the groups including a group of the light-emitting devices that belong to blue in the visible light range, a group of the light-emitting devices that belong to green in the visible light range, and a group of the light-emitting devices that belong to red in the visible light range, and controls the image pick-up device unit to capture a moving image while the groups of the light-emitting devices are sequentially lighted-on.