PROBLEM TO BE SOLVED: To provide a soil contamination purification cost computation system capable of computing soil contamination purification cost with adequacy while keeping secrecy and urgency. SOLUTION: This soil contamination purification cost computation system is provided with an input means to input main conditions and subsidiary conditions, a purification method selecting means to select purification methods applicable to a subject place based on the main conditions and information preliminarily stored in a technical requirements master 4, a necessary system number calculating means to calculate a system number necessary for each purification method based on the subsidiary conditions corresponding to each purification method and information preliminarily stored in a geological master 5, a purification cost calculating means to calculate cost on each purification method based on the necessary system number and unit prices of devices and facilities preliminarily stored in a device and facility unit price master 6, and an output means to output cost on each purification method.
