An apparatus and method for generating print data about a phantom customized to a patent, the apparatus receive medical images including anatomical information of a patient's body and treatment plan information about a dose distribution of a radiation to be irradiated to a treatment area, reconstructs a three-dimensional phantom image in which internal and external structures of the patient's body are modeled which are based on the anatomical information and in which a space for a dosimeter is modeled which is to be inserted into the internal and external structures so as to verify the dose distribution according to the treatment plan information, and generates print data for three-dimensional printing, which is used for manufacturing the phantom customized to the patient on the basis of the reconstructed three-dimensional phantom image.
