An ultrasound system(1B, 1D, 1F, 1K) comprising: an ultrasound probe(2B, 2D, 2F, 2K); a mobile information terminal(3B, 3D, 3F, 3K); and an external apparatus(4B, 4D, 4F, 4G, 4H, 4K), wherein the ultrasound probe(2B, 2D, 2F, 2K) includes a transducer array, a transmission and reception circuit that transmits an ultrasonic wave from the transducer array and generates a sound ray signal based on a reception signal acquired by the transducer array, an ultrasound image generation unit that generates an ultrasound image based on the sound ray signal generated by the transmission and reception circuit, and a probe-side wireless communication unit that wirelessly transmits the ultrasound image, the mobile information terminal(3B, 3D, 3F, 3K) includes a camera unit that acquires a view image obtained by imaging a scanning point of the ultrasound probe(2B, 2D, 2F, 2K) in a subject, and a terminal-side wireless communication unit that wirelessly transmits the view image acquired by the camera unit, the external apparatus(4B, 4D, 4F, 4G, 4H, 4K) includes an external wireless communication unit that is wirelessly connected to at least the terminal-side wireless communication unit, an external monitor, a display controller that displays the ultrasound image wirelessly transmitted from the ultrasound probe(2B, 2D, 2F, 2K) and the view image wirelessly transmitted from the mobile information terminal(3B, 3D, 3F, 3K) on the external monitor, and an external input device, and wherein the ultrasound system is operational such that, in a case where a probe freeze instruction is input from the external input device, the probe freeze instruction is transmitted from the external wireless communication unit to the probe-side wireless communication unit, and the transmission of the ultrasonic wave from the transducer array by the transmission and reception circuit of the ultrasound probe is stopped(2B, 2D, 2F, 2K), characterized in that the external apparatus (4, 4A, 4B, 4G, 4H) includes an image synchronization unit that synchronizes the ultrasound image and the view image with each other, the external apparatus includes an image memory that stores the ultrasound image and the view image synchronized with each other by the image synchronization unit each time the probe freeze instruction is input from the external input device, and the external apparatus includes a thumbnail image generation unit that generates a plurality of thumbnail images each consisting of the ultrasound image and the view image stored in the image memory and displays the plurality of generated thumbnail images in a list on the external monitor. an ultrasound probe(2B, 2D, 2F, 2K); a mobile information terminal(3B, 3D, 3F, 3K); and an external apparatus(4B, 4D, 4F, 4G, 4H, 4K), wherein the ultrasound probe(2B, 2D, 2F, 2K) includes a transducer array, a transmission and reception circuit that transmits an ultrasonic wave from the transducer array and generates a sound ray signal based on a reception signal acquired by the transducer array, an ultrasound image generation unit that generates an ultrasound image based on the sound ray signal generated by the transmission and reception circuit, and a probe-side wireless communication unit that wirelessly transmits the ultrasound image, the mobile information terminal(3B, 3D, 3F, 3K) includes a camera unit that acquires a view image obtained by imaging a scanning point of the ultrasound probe(2B, 2D, 2F, 2K) in a subject, and a terminal-side wireless communication unit that wirelessly transmits the view image acquired by the camera unit, the external apparatus(4B, 4D, 4F, 4G, 4H, 4K) includes an external wireless communication unit that is wirelessly connected to at least the terminal-side wireless communication unit, an external monitor, a display controller that displays the ultrasound image wirelessly transmitted from the ultrasound probe(2B, 2D, 2F, 2K) and the view image wirelessly transmitted from the mobile information terminal(3B, 3D, 3F, 3K) on the external monitor, and an external input device, and wherein the ultrasound system is operational such that, in a case where a probe freeze instruction is input from the external input device, the probe freeze instruction is transmitted from the external wireless communication unit to the probe-side wireless communication unit, and the transmission of the ultrasonic wave from the transducer array by the transmission and reception circuit of the ultrasound probe is stopped(2B, 2D, 2F, 2K), characterized in that the external apparatus (4, 4A, 4B, 4G, 4H) includes an image synchronization unit that synchronizes the ultrasound image and the view image with each other, the external apparatus includes an image memory that stores the ultrasound image and the view image synchronized with each other by the image synchronization unit each time the probe freeze instruction is input from the external input device, and the external apparatus includes a thumbnail image generation unit that generates a plurality of thumbnail images each consisting of the ultrasound image and the view image stored in the image memory and displays the plurality of generated thumbnail images in a list on the external monitor.