An access point comprising means configured to: acquire information obtained from a reception terminal or characteristics or performance of a reception terminal; and generate transition information on a basis of the acquired information, wherein: the transition information is related to transition from a first, current, mode in which centralized communication implementing multi-user communication triggered by a periodic trigger frame for a duration included in the trigger frame is performed by the access point with reception terminals, to a second mode, different from the first mode, in which autonomous decentralized communication between the access point and a reception terminal is performed, the access point characterized in that: the transition information comprises information indicating that a next trigger frame is not going to be transmitted from the access point within the duration of the first mode; the access point comprises means to generate a frame containing the transition information; and the access point comprises means to transmit the generated frame to a reception terminal causing the reception terminal, when no next trigger frame is transmitted by the access point until the end of the duration, to transition to the second mode. acquire information obtained from a reception terminal or characteristics or performance of a reception terminal; and generate transition information on a basis of the acquired information, wherein: the transition information is related to transition from a first, current, mode in which centralized communication implementing multi-user communication triggered by a periodic trigger frame for a duration included in the trigger frame is performed by the access point with reception terminals, to a second mode, different from the first mode, in which autonomous decentralized communication between the access point and a reception terminal is performed, the access point characterized in that: the transition information comprises information indicating that a next trigger frame is not going to be transmitted from the access point within the duration of the first mode; the access point comprises means to generate a frame containing the transition information; and the access point comprises means to transmit the generated frame to a reception terminal causing the reception terminal, when no next trigger frame is transmitted by the access point until the end of the duration, to transition to the second mode. the transition information is related to transition from a first, current, mode in which centralized communication implementing multi-user communication triggered by a periodic trigger frame for a duration included in the trigger frame is performed by the access point with reception terminals, to a second mode, different from the first mode, in which autonomous decentralized communication between the access point and a reception terminal is performed, the access point characterized in that: the transition information comprises information indicating that a next trigger frame is not going to be transmitted from the access point within the duration of the first mode; the access point comprises means to generate a frame containing the transition information; and the access point comprises means to transmit the generated frame to a reception terminal causing the reception terminal, when no next trigger frame is transmitted by the access point until the end of the duration, to transition to the second mode. the transition information comprises information indicating that a next trigger frame is not going to be transmitted from the access point within the duration of the first mode; the access point comprises means to generate a frame containing the transition information; and the access point comprises means to transmit the generated frame to a reception terminal causing the reception terminal, when no next trigger frame is transmitted by the access point until the end of the duration, to transition to the second mode.