The present invention relates to an N-phenyl-2-pyrimidine-amine derivative showing a superior effect on lung cancer, gastric cancer, colon cancer, pancreatic cancer, hepatoma, prostatic cancer, breast cancer, chronic or acute leukemia, hematologic malignancy, encephalophyma, bladder cancer, rectal cancer, or cervical cancer, etc. of warm-blooded animals and its salt. The present invention also relates to a process for preparing the compound, and to a pharmaceutical composition for the treatment of the above various diseases, which comprises an effective amount of the compound as an active ingredient together with pharmaceutically acceptable inert carriers.