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(57) ABSTRACT A packet generation unit (10) generates a predetermined number of measurement packets at predetermined transmis sion intervals that increase in equal increments, and a trans mission/reception unit (13) transmits the measurement pack ets to a reception device (2) in accordance with control performed by a transmission control unit (12). A calculation unit (21) calculates an available bandwidth in accordance with the reception intervals of the measurement packets received by a transmission/reception unit (20), and the trans mission/reception unit (20) transmits the available bandwidth to a transmission device (1). A resolution alteration unit (14) determines, in accordance with the available bandwidth received by the transmission/reception unit (13), whether or not to change the measurement resolution. A size alteration unit (15) changes the minimum packet size, maximum packet size and packet …