To provide a communication system and a communication method where a base station and a plurality of mobile stations make mutual communication, the base station makes communication with any mobile station by using a slot assigned by the base station as conventionally and the mobile stations make communication by using a slot not assigned so as to effectively utilize radio wave resources and attain direct communication among the mobile stations.
The communication system is configured such that each mobile station is provided with a means for receiving a control slot sent from the base station, a means for analyzing the received control slot so as to detect a slot not in use, and a means for transmitting/receiving data with other mobile station by using the slot not in use.
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