A search device has a know-how storing unit for storing a log indicating a past crisis response instance, one of a “problem” label indicating that the log is of a problem instance that is to be responded and solved, a “result” label indicating that the log is of a result brought about by a responding action, and a “response” label indicating that the log is of a responding action that has been performed to solve a problem, and a task number corresponding to the log, in association with each other. Further, there is a know-how search unit for repeating a search to retrieve a log similar to a first search key that is an input log from logs assigned the “problem” label in the know-how storing unit, and a search to retrieve a log similar to a second search key.