1. A system for search comprising at least one processor to implement: a preliminary data analysis part configured to analyze input images to extract a variety of attributes, analyze a trend about a category of information requested by a client by using the extracted variety of attributes, and store, based on trend analysis, trend information as metadata; an index part configured to make the metadata searchable by structuralizing the metadata and storing the structuralized metadata; and a search part configured to extract the trend information matching the category of information requested by the client from the searchable metadata and provide the trend information in a predetermined format, wherein the preliminary data analysis part comprises: an occurrence frequency analysis unit configured to analyze, as first trend information of the trend information, an occurrence frequency of the category in a random time period; a change analysis unit configured to analyze, as second trend information of the trend information, a change in the first trend information with respect to a set time; and a movement line analysis unit configured to provide, as third trend information of the trend information, a result of movement line analysis of the category, through detection and tracking of a motion in the category.