This assumes there is no typo, as quite rightly suggested by Gouranga Charan Pradhan, but in the absence of further context and if we assume there is no typo:

In the context of integrating the medium of sound with other media such as video and text, which is a form of sound manipulation, "field of multimedia integration" is appropriate, as exemplified by media transmission systems that perform digital processing to combine and transmit media such as video, speech(sound), and text:
デジタル処理の下，ビデオ画像，音声および文字情報等を複合化するマルチメディア伝送方式 found in:
http://agrinfo.narc.affrc.go.jp/fs/cdrom/1syou/102st/f02.htm

Just in case, in a more general context of information media integration, see 複合化in the first sentence of this article
http://www.nikkei.co.jp/value/