To prevent a mobile station that received a communication packet from unnecessarily reading application data, when the mobile station cannot determine from the destination address of the communication packet whether the type of a destination communication device of the communication packet is a base station or a mobile station.

A communication packet transmitted by communication devices 2 and 3 includes information indicating a type of a destination communication device. The information indicating the type of the destination communication device is provided in a control field that is to be read by a layer higher than a MAC layer or a processing section accessed by the higher layer on the receiving side of the communication packet.