1. A method of detecting a specific object using a multi-dimensional image including the specific object implemented by an apparatus for detecting a specific object in an image, the method comprising: with respect to each window slide of the image subjected to window sliding by applying a previously generated 3D cube filter, normalizing, by the apparatus, data of an area corresponding to the window sliding in a previously defined specific form; assigning, by the apparatus, a corresponding part of the normalized data to each cell in the 3D cube filter and then calculating a volume of each of the cells, thereby expressing the volumes of the cells as one volumetric feature vector having a volumetric feature; and applying, by the apparatus, the volumetric feature vector to a classifier so as to decide whether or not the data of the area corresponding to the window slide corresponds to the specific object.