With a measurement device attached to the upper arm as a master, a measurement device, which is a slave, attached to the ankle is controlled to measure a pulse wave in synchronization. The measurement device on the master side obtains a measurement result from the measurement device on the slave side, and detects the appearance time difference of the pulse wave waveforms by synchronizing the pulse waves measured in both measurement devices, thereby calculating a Pulse Wave Velocity as the index of arterial sclerosis.
