The psychological state and changes over time of cancer patients in the active treatment stage were classified into emotions by the speech and behavior of the patient described in the medical record article of the cancer psychological interview record, and the analysis of the "emotional state map" was attempted. In all cases, positive / negative emotions were mixed and appeared with variation, but a relatively large number of positive emotions, including , , and , were manifested, and the same was true in patients who experienced stressful treatment events. In the background, the existence of appropriate support from medical professionals and psychological characteristics peculiar to the stage of active treatment was inferred, such as the active treatment of the target patient, the hospitalization environment in which mental and physical pain promptly appealed to medical professionals, and the influence of psychological interviews. Cancer patients during active treatment perceived and expressed changes in the body and pain caused by the disease, and after responses from medical professionals and family members, they were conscious of their physical condition and emotions. It is suggested that this analysis method helps to objectively understand and explain the invisible and ever-changing psychological state of cancer patients in the active treatment stage.