In high intensity proton synchrotrons, linear and nonlinear betatron resonances cause beam loss. When the betatron tune spreads over a resonance line, the betatron oscillation amplitude will get larger, causing large beam loss. Our study aims for a direct measurement of the betatron tune spread by using a quadrupole kicker and a four-electrode monitor. The monochromatic RF signal is transfered to the kicker and we induce an oscillation by kicking the beam. The amplitude of the quadrupole oscillation will depend on the number of particles having a certain tune. In the beam test at J-PARC MR, the dipole kicker was used as a quadrupole kicker by exciting the two facing electrodes in-phase. We measured the response to the kick at several frequencies. We observed that the amplitude of the quad-rpole oscillation depends on the kicker frequency and the number of particles per bunch. This demonstrates that the quadrupole oscillation can be induced by a kicker and the possibility of measuring the number of particular tune particles from the response. We will present the result of the beam test and our prospect and the comparison between the experimental result and a numerical calculation.