An apparatus for evaluating validity of detection of a cancer region may be provided. The apparatus comprises a parametric magnetic resonance imaging (MRI) provider configured to provide at least one MRI constructed based on different parameters, a first cancer region input unit configured to receive a first cancer region based on the at least one parametric MRI, a cancer region processor including a cancer region detection model for receiving the at least one parametric MRI as input and outputting cancer region information and configured to generate and provide guide information corresponding to an image to be analyzed through the cancer region detection model, a second cancer region input unit configured to receive a second cancer region based on the guide information, and a validity evaluator configured to generate validity evaluation information of the second cancer region, by comparing the first cancer region with the second cancer region based on a pathology image obtained by mapping a region, in which cancer is present, of an extracted body portion.