1. A music piece reproducing apparatus comprising: a sound collecting unit collecting noise data of an ambient environment; an analyzing unit performing a frequency analysis to the noise data collected by said sound collecting unit and extracting a feature amount showing a feature of said noise data; a noise parameter database classifying the noise data every environment; and a reproducing unit reproducing music piece data which has been recorded in a recording medium and classified every category, wherein said analyzing unit classifies said noise data with reference to said noise parameter database on the basis of the extracted feature amount of said noise data, selects the previously-corresponded category of music pieces in accordance with a classification result of said noise data, and selects predetermined music piece data from music piece data classified into said selected category.