An object of the present invention is to provide a method of controlling and observing binding of sample substances in an aqueous solution. An apparatus of the present invention has a unit applying a strong magnetic field to a sample and an oscillator applying an electromagnetic wave in a THz field onto the sample. A probe and an observing unit which can bring about nuclear magnetic resonance in the sample and detect it are arranged. An electric signal is sent to a THz-ray oscillator to apply an electromagnetic wave having a resonance frequency of unpaired electron spin of the sample onto the sample. An electric characteristic of the nuclear magnetic resonance is detected to observe a binding change in the sample.

 
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