INFORMATION RETRIEVAL DEVICE, INFORMATION RETRIEVAL METHOD, AND INFORMATION RETRIEVAL PROGRAM

PROBLEM TO BE SOLVED: To provide an information retrieval device or the like for facilitating information retrieval.SOLUTION: An information retrieval device 1 includes: an association part 2 which prepares tags for a plurality of first pieces of data 4, associates the tags with the first data 4 according to a predetermined format expressing first related information 5 within the first data 4, and makes a result as second associated information; and a retrieval part 3 which retrieves second data associated with specific first data 4 in the first related information 5, and retrieves a specific tag associated with the second data in the second associated information.