The power loss (P_cv) in Ni-Zn ferrite was analyzed by combining two methods. That is, P_cv was divided into hysteresis loss (P_h) and residual loss (Pr) from the frequency dependence of the power loss according to the method of Otsuki et al., as a first approach, and also the loss factors attributed to domain wall motion (P_w) and the rotation magnetization (P_rot) by adapting the method proposed by Visser et al. as the other one. The hysteresis loss dominates P_cv in the frequency range below 500kHz, while Pr becomes predominant factor in the higher frequency range more than 500kHz. On the other hand, P_w dominates P_cv in the measured frequency range. It was found, by comparing the loss factors obtained by the analyzing methods, that Pr is mainly attributed to the domain wall motion in the lower frequency range and to the both magnetization processes in the megahertz range. It was also found that P_w consists of P_h and another loss factor which can be attributed to the dynamic motion of the domain wall.