1. An apparatus for servicing a brain disease diagnosis based on an image obtained from a magnetic resonance imaging (MRI) apparatus, the apparatus comprising a processor, wherein said processor comprises: a receiving unit configured to receive an image of a diagnostic subject obtained from the MRI apparatus; a preprocessing unit configured to estimate a transformation matrix for matching a preset standard image to the image received from the receiving unit and apply the estimated transformation matrix to a preset standard brain region map such that an individual brain region map of the diagnostic subject is generated; a feature extracting unit configured to calculate an occupancy ratio of a brain lesion of each brain region in the generated individual brain region map of the diagnostic subject a disability type determining unit configured to determine a disability type based on the calculated occupancy ratio of the brain lesion of each brain region; a disability degree classifying unit configured to classify a disability degree corresponding to the calculated occupancy ratio of the brain lesion of the diagnostic subject, based on a reference value set by using occupancy ratios of brain lesions of diagnostic subjects having the same disability type as that determined by the disability type determining unit and a prognosis predicting unit configured to predict a prognosis of the determined disability type in accordance with the classified disability degree.