A medical system includes: an image signal acquiring portion for acquiring a signal to generate an image corresponding to a picture of a subject an image generating portion for generating a real-time image of an inside of the test subject based on the acquired signal a detecting portion for outputting a position and an orientation of an image position and orientation detecting element as a detection value a reference image data storage portion for storing reference image data made up of anatomical images of the test subject a guide image generating portion for generating a guide image to provide guide information about at least one of an anatomical position and orientation within the test subject of the real-time image, based on the detection value and the reference image data and a detection state notification information generating portion for generating information to notify a detection state of the detection value.
