An information processing apparatus for separating input musical number information into a vocal information part containing lyrics in a first language and an accompaniment information part, and for producing second musical number information made of the accompaniment part and a translated vocal information part superimposed thereon. A vocal separation unit separates the first vocal information part and the accompaniment information part from the input first musical information. A processing unit generates first language lyric information by speech recognition of the separated first vocal information part, translates the generated first language lyric information into second language lyric information, and supplies the second language lyric information. A synthesis unit synthesizes the supplied second language lyric information, the accompaniment information part, and the separated first vocal information part to generate second musical information. The second musical information includes the accompaniment information part and a second language vocal information part.