1. An apparatus for obtaining information of an object in a turbid body, comprising: a light irradiation means for irradiating light onto a first light-irradiated region of a surface of the turbid body and an adjacent light-irradiated region of a surface of the turbid body, wherein the irradiating light has a different optical characteristic between the object and the turbid body; a detection means for detecting intensity of light back-scattered from the turbid body, the detection carried out at a first detection region of the surface of the turbid body, and an adjacent detection region of the surface of the turbid body, which are spaced apart from the first light-irradiated region and adjacent light-irradiated region; an analysis means for analyzing position information of the object in the turbid body from the intensity of the back-scattered light; and a scanning means for scanning the first light-irradiated region, adjacent light-irradiated region, and the first detection region and adjacent detection region on the surface of the turbid body at the same time, wherein a size of each of the first detection region and adjacent detection region is larger than a distance between a center of the first detection region and a center of the adjacent detection region, so that a portion of the first detection region overlaps a portion of the adjacent detection region, forming an overlap region.