This invention provides an electronic medical chart system which synchronize medical information on a database with medical information described in a paper medical chart. When data is directly changed by input part other than an electronic pen, a keyboard or the like, a correlation between the paper medical chart and electronic medical chart is released. When a medical record is described in the paper medical chart by the electronic pen, medical record data is reflected in the electronic medical chart based on handwriting data that is described. When the medical record data is directly changed, the correlation between the paper medical chart and electronic medical chart is released, and a new ID is assigned to a reprinted new paper medical chart. When an additional medical record is described in the new paper medical chart again by the electronic pen, the handwriting data is reflected in the electronic medical chart.