Objective: In this practical study, mindfulness-based “Loving-Kindness and Mindfulness Meditation” was carried out for breast cancer patients. Methods: 60-minute meditation sessions were carried out every two weeks for a total of four sessions. At Month 1 and in the period up to Month 3 after intervention, changes in quality of life (QOL) were assessed using SF-36 v2 for a total of five times. Participants were taught to practice meditation at home, and their daily meditation experiences were written down as records. Results: Participants were divided into two groups, with two subjects in the intervention group and one subject in the non-intervention group. RCS based on SF-36 v2 were in the intervention group, and could be maintained or improved even one month after completion of intervention compared to before intervention. The records were divided into “Introduction phase” (for meditation in the first intervention); “Acquisition phase” (in and after the second); “Stable phase” (in and after the third); and “Establishment phase” (in and after the fourth). Correspondence analysis was performed for the fourth term by Text Mining. Conclusion: During early intervention at the “Introduction phase,” intentional concentration on what is occurring is carried out. As meditations continue, a change in the sense of self-consciousness, which cannot be experienced in daily life, is thought to occur.