Provided is a data output method including: receiving unit-time or unit-size auditory data which are generated around a user and detected via a first apparatus; removing noises from the auditory data; extracting a frequency component included in the auditory data from which the noises have been removed; measuring at least one frequency of the auditory data on the basis of the frequency component; searching a database on the basis of the at least one frequency to find reference data oscillating at the at least one frequency; generating first output data providing semantic data included in the reference data; and generating and providing an output control signal for transmitting the first output data.