INFORMATION SEARCH METHOD, INFORMATION SEARCH DEVICE AND INFORMATION SEARCH SYSTEM

Provided are an information search method, an information search device, and an information search system, which enable a searcher (user) to easily understand an influence degree of the presence or absence of a search keyword input from the searcher (user) on a search result. An information search device 1 includes a keyword input receiving unit 21 that receives an input of a plurality of search keywords, a search executing unit 22 that extracts a plurality of documents from a document database 25 that stores a plurality of documents including document data and/or image data as a search result on the basis of the plurality of received search keywords, a search keyword influence degree calculating unit 23 that obtains an influence degree of the presence or absence of the received search keywords on the search result for each search keyword, and a display unit 3 that displays the influence degree of each search keyword on a screen together with the search result.