A radio LAN system includes a server configured to hold a file; an access point connected with the server; a LAN terminal connected with the access point by radio; and a client terminal configured to issue a file transfer request to the server. An operation mode between the access point and the LAN terminal is set to a non-compression mode in which compression of the file is not performed, when the file is in a compressed state, and to a compression mode in which compression of the file is performed, when the file is in a non-compressed state. The file is transferred from the server to the client terminal in the operation mode in response to the file transfer request.