A station device comprising: a communication unit configured to receive a response frame not including information indicating a transmission source; and a control unit configured to determine whether or not the response frame is a frame transmitted from another device belonging to a same network as the station device, on a basis of information regarding the response frame; wherein the information regarding the response frame is information regarding reception power of the response frame; characterized in that the control unit is configured to determine that the response frame is a frame transmitted from another device belonging to the same network as the station device in a case where the reception power is greater than a threshold; wherein the control unit is configured to set a first transmission suppression period for the same network as the station device in a case of determining that the response frame is a frame transmitted from another device belonging to the same network as the station device, and to set a second transmission suppression period for another network in a case of determining that the response frame is not a frame transmitted from another device belonging to the same network as the station device; wherein the communication unit is configured to receive a CF-End frame, and the control unit is configured to end one of the first transmission suppression period and the second transmission suppression period on a basis of reception of the CF-End frame; wherein, in a case where reception power of the CF-End frame that is received during the second transmission suppression period set on a basis of one or more previously received response frames is less than a maximum value of reception power of the one or more previously received response frames, the control unit is configured to reduce transmission power of a signal transmitted by the station device, and to cancel the second transmission suppression period. a communication unit configured to receive a response frame not including information indicating a transmission source; and a control unit configured to determine whether or not the response frame is a frame transmitted from another device belonging to a same network as the station device, on a basis of information regarding the response frame; wherein the information regarding the response frame is information regarding reception power of the response frame; characterized in that the control unit is configured to determine that the response frame is a frame transmitted from another device belonging to the same network as the station device in a case where the reception power is greater than a threshold; wherein the control unit is configured to set a first transmission suppression period for the same network as the station device in a case of determining that the response frame is a frame transmitted from another device belonging to the same network as the station device, and to set a second transmission suppression period for another network in a case of determining that the response frame is not a frame transmitted from another device belonging to the same network as the station device; wherein the communication unit is configured to receive a CF-End frame, and the control unit is configured to end one of the first transmission suppression period and the second transmission suppression period on a basis of reception of the CF-End frame; wherein, in a case where reception power of the CF-End frame that is received during the second transmission suppression period set on a basis of one or more previously received response frames is less than a maximum value of reception power of the one or more previously received response frames, the control unit is configured to reduce transmission power of a signal transmitted by the station device, and to cancel the second transmission suppression period.