An apparatus and a method for inspecting a semiconductor includes a water tank which includes a housing, an interior of which is filled with a liquid, and a support block which provides a settling surface for an inspection object inside the housing. A plurality of signal generators are installed on a bottom surface of the housing, and output a frequency signal in a direction in which the inspection object is located. A power supply operates the signal generators. A probe is placed above the inspection object, and a receiver which operates with the probe and is attached to a bottom surface of the support block. Foreign matter remaining on the inspection object are removed, using a plurality of frequency signals which are output by the plurality of signal generating units.