1. A magnetic resonance imaging (MRI) apparatus comprising: a data acquisition unit configured to acquire a first image by performing an MRI scan on an object; and an image acquisition unit configured to acquire a second image by performing de-noising filtering on the first image in a spatial domain, acquire a third image based on the first image and the second image, acquire a fourth image by performing low-pass filtering on the third image in a frequency domain, and acquire a final image based on the second image and the fourth image.