1. A computer-aided diagnostic (CAD) apparatus comprising: at least one processor; and at least one memory storing one or more computer programs configured to be executed by the at least one processor, the one or more computer programs including instructions to: select an image analysis algorithm based on a speed of a probe or a resolution of a current image frame obtained by the probe, and detect and classify a region of interest (ROI) in the current image frame using the selected image analysis algorithm.