1. A magnetic resonance imaging (MRI) apparatus comprising: a scanner configured to acquire a first image that is a T1-weighted image and a second image that is a fluid attenuated inversion recovery (FLAIR) image by performing an MRI scan on a brain; an image processor configured to: determine a white matter region in the second image based on the first image and the second image; and detect a white matter hyperintensity (WMH) region in the determined white matter region; and an output interface configured to display the detected WMH region and a change in the WMH region over time.