1. A method of mapping image information of a target object onto an interface of the target object in magnetic resonance imaging (MRI), the method comprising: obtaining the image information of the target object in a path connected between a predetermined point on an external interface of the target object and a point on an internal interface of the target object corresponding to the predetermined point on the external interface of the target object; analyzing the obtained image information; extracting one piece of the obtained image information based on the analysis result; allotting the extracted image information onto the interface of the target object to adjust the interface in an MRI image of the target object; and generating and displaying the MRI image of the target object with the adjusted interface, wherein obtaining the image information of the target object comprises, obtaining distance information of tissues included in the target object; detecting a first position on the path adjacent to the external interface and corresponding to a maximum value of the image information and a second position on the path adjacent to the external interface and corresponding to a minimum value of the distance information; and obtaining a predetermined position range between the first position and the second position.