To measure and adjust a resonance frequency of each resonator, degrees of coupling between the resonators, and degrees of coupling between the resonators and input/output terminals as separate adjustment factors separately without taking into account the mutual interference in a high frequency filter with a cascade connection structure of a plurality of resonators.

When adjusting the high frequency filter containing two or more resonators in cascade connection, at first, two of the neighboring resonators are selected and enabled to adjust a coupling capacity between them. Then, the resonance frequency of each resonator 32, 33 is adjusted.