The present invention is a law retrieval apparatus composed of: data storage means including a constitution and statute database and a judicial case database, and including at least one database out of a meta-keyword database, a verb and object database, and an aid flow database; and a law retrieval server including, in correspondence with each database accumulated in the data storage means, at least one retrieval processing means out of meta-keyword retrieval processing means for reading a retrieval keyword associated with a non-retrieval keyword received from the meta-keyword database to perform retrieval processing, verb and object retrieval processing means for reading a retrieval keyword associated with a combination of the received verb and object from the verb and object database to perform retrieval processing, and aid flow retrieval processing means, when a retrieval pattern matches a pattern of an aid flowchart, for requesting additional information in accordance with the flowchart.