A search information analyzing unit (101) separates search information (15) into structured search information (152) representing a structure of moving image contents, semantic search information (153) representing characteristics in semantic context of the moving image contents, and signal search information (154) representing physical characteristics of signals of the moving image contents, and outputs the results. A structural search information disassembling unit (102) extracts and outputs, from the applied structural search information, information corresponding to at least one of the semantic search information and signal search information as structural information (50). A unit search information forming unit (103, 104) adds, to at least one of the applied semantic search information and signal search information, to form a small unit of search information (153A, 154A). Such a small unit of search information can be used as search information for the moving image contents, and hence, the amount of search information can be reduced.