Boundary segmentation apparatus and method based on user interaction

The present invention relates to an apparatus for segmenting a region of interest in an image based on user interaction. An apparatus for segmenting a region of interest according to an embodiment includes an interface unit which provides a user terminal with an interface supporting one or more contour modification modes, overlays an image with a contour of a region of interest extracted from the image, and displays the image on the interface, and a contour modification unit which modifies a contour, based on a selected modification mode and an input depending on an operation, when a user selects one of the contour modification modes and performs the operation for modifying the contour, on the interface.