1. A method of inspecting defects of a sample, the method comprising the steps of: a first step for, on a basis of position information of defects on a sample placed on a table that is movable in an X-Y plane in which the position information of defects is previously detected and obtained by inspecting the sample by an other inspection system, driving the table and making the defects come into a viewing field of an optical microscope, and adjusting focus of the optical microscope onto the sample; a second step for re-detecting the defects, based on the position information, by the optical microscope to obtain a first detection result; a third step for correcting displacement amounts of the position information of defects on a basis of position information of defects re-detected from the first detection result obtained at the second step; and a fourth step for reviewing the defects, whose position information is corrected at the third step, by an electron microscope to obtain a second detection result; wherein types of defects are classified based upon defects on a surface and inside the sample being detected by the first detection result and defects on the surface of the sample being detected by the second detection result.