As for navigation device 1, 3 dimensional graphics data of the suffering inspection person who is acquired beforehand, the memory section the internal organs extraction sections the 1st block definition department the blood vessel extraction section and the blood vessel which extract the blood vessel inside the internal organs from 23 which appoints the tumor 60 in 22 which extract the specified internal organs from 21 which is remembered and 3 dimensional graphics data and 3 dimensional graphics data and 3 dimensional graphics data the blood vessel taxonomic section in one territory where is classified on the basis of 3 dimensional image information of 25 which is classified into either the artery or the veins and the blood vessel, on the basis of the anatomy feature of the internal organsIt is, the 2nd territory extraction section 26 which extracts the tumor excision territory which includes the tumor 60 and, it possesses.ナビゲーション装置1は、予め取得した被検者の3次元画像データ、を記憶する記憶部21と、3次元画像データから所定の臓器を抽出する臓器抽出部22と、3次元画像データにおける腫瘍60を指定する第1の領域指定部23と、3次元画像データから臓器の内部の血管を抽出する血管抽出部と、血管を動脈または静脈のいずれかに分類する血管分類部25と、血管の3次元画像情報をもとに、臓器の解剖学的特徴にもとづき分類された一の領域であり、腫瘍60を含む腫瘍切除領域を抽出する第2の領域抽出部26と、を具備する。
