A center for storing and managing contents, and user terminals used by respective users are connected via networks. Also, apparatus for detecting contaminants on an external surface of a window of a viewing system comprises: at least one light source for reflecting light from contaminants on the external surface; an imager for capturing an image of the reflected light and converting the image into image data; and a processor for processing the image data to detect the contaminants on the external surface. Further, the apparatus includes a second semiconductor region that has the same depth as the depth of the first semiconductor region and a width narrower than the width of the first semiconductor region and can be potential barriers against the signal charge, between the first and a third photoelectric conversion element. The diagnostic device outputs a diagnostic message associated with a physiological condition of the patient based on the orientation of the vectors relative to the disease regions within the multidimensional space. Each of the monitoring platforms is equipped with at least one camera system in such a manner that the lines of sight of the camera systems of the two monitoring platforms being positioned opposite to and facing each other. In a preferred embodiment, the composition comprises a mixture of four prohormones, three anti-estrogen agents and at least one enteric coating.