The object of the invention is to make the adjustment of a hearing aid more convenient, for which purpose the frequency response data relating to the frequency response individually measured for the present hearing aid (HG) is stored in a memory device (S) of the hearing aid. As a result the length of a sound tube installed in the hearing aid can also be taken directly into account, for example. For the purpose of adjusting the hearing aid, the individual frequency response can then be read out from the hearing aid, thereby enabling the adjustment process to be performed much more quickly.