PROBLEM TO BE SOLVED: To support the production of a musical piece based on sound source data provided.SOLUTION: A musical piece production support device 300 comprises: musical piece producer information reception means that receives musical piece producer information about a musical piece producer from a musical piece producer terminal 200 operated by the musical piece producer; musical piece producer information recording means that records in a recording device the musical piece producer information received by the musical piece producer information reception means; musical piece producer information transmission means that, in response to a request from a sound source provider terminal 100 operated by a sound source provider, reads out the musical piece producer information recorded in the recording device and transmits the musical piece producer information to the sound source provider terminal 100; sound source data receiving means that receives sound source data from the sound source provider terminal 100; sound source data recording means that records in the recording device the sound source data received by the sound source data receiving means; and request destination information reception means that receives request destination information from which a musical piece producer is determined to ask for musical piece production using sound source data recorded by the sound source data recording means from the sound source provider terminal 100.
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