An apparatus, a system and a method for setting security information on a wireless network, wherein the security information of a wireless networking apparatus is set by means of a portable device which can be used conveniently by a user, to thereby enhance the security over wireless communications. An apparatus for setting security information in a wireless network includes a limit communication module to receive encryption information sorted by an access point, a key creation module to create encryption keys based on the received encryption information or encryption information input by a user, and an authentication information creation module to create authentication information according to rules associated with the authentication information sent by the access point and stations.