| 摘要 |
In an e-mail creating/sending device, an ID corresponding to attached data representing image or voice/sound included in multimedia data is generated. This multimedia data with attached data converted to the ID is sent to an e-mail receiving/reproducing device via a network. In this e-mail receiving/reproducing device, real data corresponding to the ID is generated and image or voice/sound represented by this real data is reproduced. The attached data, ID and real data are categorized and registered and an approximate ID or real data substitutes based on the category.
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