A method for judging feature of malignant tumor is described herein. The method comprises obtaining step, first comparing step, second comparing step, and judging step. The obtaining step comprises obtaining a first parameter based on activity and expression level of a first CDK contained in a tumor cell of the malignant tumor, a second parameter based on activity and expression level of a second CDK contained in the tumor cell, a third parameter based on the first parameter and the second parameter, and a fourth parameter based on expression level of a growth factor receptor in the tumor cell. The first comparing step comprises comparing a first threshold value with the third parameter. The second comparing step comprises comparing a second threshold value with the fourth parameter. The judging step comprises judging the feature based on the comparison results of the first comparing step and the second comparing step. Also described is a computer program or program product executing the steps of the method.