1. A capsule endoscope system comprising: a capsule endoscope configured to be introduced into an inside of a subject and to image the inside of the subject; a guiding unit configured to generate a magnetic field to guide the capsule endoscope; a guidance magnetic field control unit configured to switch between ON and OFF of the magnetic field generated by the guiding unit; a body posture discriminating unit configured to discriminate a body posture of the subject; a model extracting unit configured to extract a body posture model according to the body posture of the subject discriminated by the body posture discriminating unit, from among prepared body posture models, and to extract an organ model according to the body posture of the subject discriminated by the body posture discriminating unit, from among prepared organ models correlated with the body posture of the subject; and a display control unit configured to: distinguish between ON and OFF of the magnetic field generated by the guiding unit, based on switching by the guidance magnetic field control unit; superimpose the organ model according to the body posture of the subject extracted by the model extracting unit, on the body posture model extracted by the model extracting unit to produce a superimposed image, and to display the superimposed image when the magnetic field generated by the guiding unit is distinguished to be ON; and display the body posture model extracted by the model extracting unit and to hide the organ model when the magnetic field generated by the guiding unit is distinguished to be OFF.