This paper describes an automatic multimedia content indexing system that includes acoustic segmentation, automatic speech recognition, topic segmentation, and video indexing features. The system is intended for indexing of multimedia news programs. Speech segments extracted from news content are delivered to the speech recognition module. The speech recognition result is segmented into topics using a segmentation algorithm based on word conceptual vectors. The indexing results derived from audio and speech information are integrated with video indexing results to extract the story structure. Experimental results show that topic segmentation using word conceptual vectors is superior to the conventional method using local word co-occurrence frequencies, and that the integrated segmentation provides better news story structures than would be possible with any single type of information.