A probe-side processor generates image information data on the basis of a sound ray signal generated, and the image information data generated by the probe-side processor is stored in a probe-side cine-memory. In a case where a freeze mode is designated, the past image information data stored in the probe-side cine-memory is wirelessly transmitted from the probe-side wireless communication circuit, and a terminal-side processor displays an ultrasound image on a monitor on the basis of the past image information data received by a terminal-side wireless communication circuit.