MCNet is a management system that control medical imaging information by data-base. It has a viewer function that displays CT, MRI, CR, ultrasound, endoscopic, and pathological microscopic images and in addition, it has multi-frame display, searching, marking, and measuring functions. It also manages virtual slide images for a pathological examination. MCNet is developed to manage files or DICOM receiver in combination with other applications including our software products such as examination departments support system MPM, MRI blood flow analysis program Flova, or MRI heart motion analysis program CardioDyna.