The present invention comprises : a real estate database in which real estate-specific actual transaction price, geographical coordinates, and similar price zone segment data are stored in advance; a price estimation model design module, which applies a parametric model and a nonparametric model to the actual price, the geographical coordinates, and similar price zone segment data of the corresponding real estate so as to respectively calculate a model-specific price for predetermined real estate of a population, assigns weights, which are the same or different from each other, to each calculated model-specific price so as to calculate a weight-applied price, compares the calculated weight-applied price to the price zone segment data of corresponding real estate so as to determine similarity therebetween such that the price difference is determined according to physical location, and interpolating the weight-applied price in a space in consideration of physical location so as to calculate an estimated price, when the determination result price difference according to the physical location of the weight-applied price is greater than or equal to a predetermined reference value; an estimated price validation verification module for verifying the validation of the estimated price by comparing the estimated price with the actual transaction price; a population price estimation module for calculating the estimated price of the remaining real estates in the population according to the calculation method of the price estimation model design module when the validity is verified; an estimated price adequacy review module for reviewing the adequacy of the estimated price of the remaining real estate in the population by comparing the price range of the estimated price of the population real estate and the price range of the actual transaction price; and an estimated price provision module for providing the reviewed estimated price online when the estimated price is reviewed as being appropriate.