A used car information search method of inputting a search condition containing car type information for specifying a type of a used car, searching for used car data coincident with the search condition from a used car database containing the car type information and price information, and outputting the searched used car data. This method comprises a step of researching the price information in all records of used car data coincident with the car type information contained in the search condition, and creating price research information, and a step of transmitting the used car data coincident with the search condition and the price research information for displaying them to a user. This scheme enables an efficient search for the used car information regardless of how much a prospective purchaser is skilled at searching.