  We discuss the relation between the Wilson's numerical renormalization
group(NRG) for the Kondo impurity problem and a field theory in the background
AdS_3 space time, where the radial coordinate plays a role of the controlling
parameter of the effective mass scale. We find that the Wilson NRG can be
described by the boundary Rindler field and then the cutoff parameter \lambda
of the Wilson NRG is related to the AdS radius L through \lambda = 2k_F/\omega
L, where k_F is the effective Fermi wave number. It is also found that the
Rindler space is discretized with the lattice space of a=\pi/k_F.
