1. An apparatus for providing additional information for region of interest, the apparatus comprising: a region of interest extractor configured to extract regions of interest from a first medical image and at least one second medical image; a region of interest merger configured to merge a region of interest of the at least one second medical image into the first medical image; an additional information determiner configured to determine additional information required for each region of interest; and an additional information provider configured to provide the determined additional information for the each region of interest.