An ultrasound system (1) includes an ultrasound probe (2), a mobile information terminal (3), and an external apparatus (4). The ultrasound probe (2) includes a transmission and reception circuit (22) that transmits an ultrasonic wave from a transducer array (21) and generates a sound ray signal, and a reception data generation unit that generates reception data before imaging based on the sound ray signal. The mobile information terminal (3) includes a camera unit (33) that acquires a view image. The external apparatus (4) includes a display controller (44) that displays an ultrasound image generated based on the reception data and the view image on an external monitor (45), and an input device (47). In a case where a probe freeze instruction is input from the input device (47), the transmission of the ultrasonic wave from the transducer array (21) is stopped.