| http://www.w3.org/ns/prov#value | - Namely, sound data delivering server 20 in step 1110 writes data to that effect into fee-charging database 23 in association with the user that has purchased the music data, and at a predetermined timing, sound data delivering server 20 transmits to fee-charging server 30 a data needed in specifying the user, such as a telephone number or a name as well as a data on the fee (See the arrow (10) of
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