PROBLEM TO BE SOLVED : To provide a real estate information providing system capable of providing real estate information of a photographing object property by easily and accurately specifying the photographing object property without excessively requiring many processes.SOLUTION : A real estate information providing system 1 includes an information processing device 2 and a user terminal 3. The information processing device 2 includes a first database DB1 storing image information obtained by extracting at least line segments from a plurality of images obtained by photographing the same object real estate property in advance in association with position information of the object real estate property, and real estate specification means 22 for specifying a photographing object property from a photographed image transmitted from the user terminal 3 and its relevant information, and provides the user terminal with real estate information relevant to the photographing object property specified by the real estate specification means 22.SELECTED DRAWING : Figure 1