1. A reproducing apparatus comprising: a reproduction unit configured to reproduce content data from a recording medium; a classification unit configured to classify a plurality of content data recorded on the recording medium into a plurality of groups; a receiving unit configured to receive a reproduction stop instruction to stop reproducing the content data, the reproducing unit stopping reproducing the content data in response to the reproduction stop instruction; a discrimination unit configured to discriminate whether the content data stopped from being reproduced by the reproduction stop instruction has already been classified into one of the groups; an inquiry unit configured to inquire of a user whether to execute, by the classification unit, a classification operation for classifying the content data stopped from being reproduced by the reproduction stop instruction into one of the groups; and a control unit configured to control, in accordance with a discrimination result by the discrimination unit, whether the inquiry unit performs the inquiry, wherein the control unit controls the classification unit to execute the classification operation in accordance with an instruction to execute the classification operation as a result of the inquiry.