An ultrasonic probe and an ultrasonic diagnosis device which can improve electrical safety for an operator are provided. One end of the metal legs connects with one end of the connecting line. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22a for receiving an input at its rear end, and a hydraulic motor 23 having a motor shaft 23a for delivering a front wheel driving force and a rear wheel driving force from the front end and rear end thereof, respectively. At least one of transmission, storage and play back of the at least one media stream is controlled in the SIP session at the first andor second entity. Next, write access to the persistent object is prevented to all threads except the respective thread.