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The producers and customers have difficulties in organizing, finding, retrieving and accessing dasiarightpsila media info, reasons for this problem stem from a lack of interoperability and semantic metadata share between several applications for multimedia processing and understanding. Thus, it is necessary to design a set of media info understanding-oriented MultiMedia Ontology (MMO). In order to effectively solve the problem of ldquosemantic gaprdquo between perceivable media world and high-level conceptual world, a novel method of semantic-layering and semantic-abstracting step by step is adopted, viz. the abstract from primary perceptive level to high-level perceptive level by various perceptual components and the abstract from high-level perceptive level to high-level conceptual level by mathematical model such as Hierarchical Hidden Markov Model (HHMM). MMO is designed by re-engineering MPEG-7 with OWL DL rules, which includes core ontology, media ontology and domain ontology, the reason for such design is to be convenient to adopt existing ontology(such as MPEG-7 and DOLCE) and easy to be extended and reused. A use case of semantic-abstracting and semantic-annotating is showed to testify the effect of MMO.