1. A Region of Interest (ROI) detection apparatus comprising: a memory configured to store instructions; and a processor that, upon executing the stored instructions, is configured to: acquire an imaging mode of a plurality of imaging modes, determine a selecting criterion corresponding to the acquired imaging mode, receive a current image, select at least one suspicious area from a plurality of areas dividing the current image based on the selecting criterion, and detect at least one ROI from the selected at least one suspicious area, wherein the selecting criterion comprises at least one of a certain number of windows to be selected as the suspicious area or a certain size of a window for dividing the corresponding image, and wherein, to select the at least one suspicious area based on the selecting criterion, the processor is further configured to divide the current image to the window of the certain size, and select the certain number of windows.