1. A method of a mobile terminal for fitting a hearing aid connected to the mobile terminal, the method comprising: acquiring location information comprising a location of the mobile terminal and movement information of the mobile terminal by using a positioning system; acquiring situation information by using at least one of a camera disposed on the mobile terminal, a user input, and a microphone of the mobile terminal; transmitting the location information and the situation information to a server; determining to receive a fitting parameter model based on the movement information and the situation information; receiving, from the server, the fitting parameter model corresponding to the situation information and the location information of the mobile terminal, and hearing characteristics of a user from among a plurality of fitting parameter models of the hearing aid; and controlling the hearing aid according to the fitting parameter model, wherein the situation information indicates at least one of surroundings, an occasion, and a situation of the user, which are determined based on at least one of an input, a sound, and a scene.