The Cancer Institute of Korea University Medical Center has developed Web version of cancer register program which is add on and revised information registry to the already existing government supported program. The previously registered government supported program gives too little information to use as either follow-up or therapeutic purpose, which leads to the necessity of newly developed program. This program consists chiefly of two parts of information to input. The first part consists again of two subparts; one part contains the same information that the already existed government supported program, and the other the necessary information of groups of hospitals and/or organizations. The second part consists of patient's additional or follow-up information that is necessary for studying or managing by clinician. The second part which is soly for clinician, who is taking care of cancer patient, can be organized by his own way for himself using varieties of combinations of group codes. All the data input and output for analysis can be done in Web basis.