A medical guiding system of the invention includes: a detection portion (4) for detecting and outputting a position and an orientation of an ultrasound transducer (31)； a reference image storage portion (52) for storing reference image data having anatomical positional information of an organ of a human body； and a guide image creation portion for creating, based on the output from the detection portion and the reference image data, a guide image configured of: an anatomical model image of the organ of the human body； an ultrasound tomographic image marker showing a position and an orientation with respect to the model image of the latest ultrasound tomographic image； and an image scan history marker showing a position and an orientation with respect to the model image, of a region where the ultrasound tomographic image has been scanned in the past.
