A method of measuring an otoacoustic emission (OAE) is provided. The method comprises generating a frequency OAE graph with N plot lines, by performing frequency sweeping on N signals having different levels, wherein N is a natural number of at least 2 and when there are plot lines that overlap each other in the frequency OAE graph, compensating values of the N plot lines of the frequency OAE graph in a predetermined frequency section including a frequency section where the plot lines overlap each other.
