Inclusion Criteria:  Patients 19 years of age or older who have been diagnosed with prostate cancer Patients who have completed surgical treatment for cancer within 3 months of screening and have no additional treatment planned Patients who can use a prognosis management application and can perform regular follow-up examinations in outpatient settings Patients carrying an Android or iOS smartphone Patients who voluntarily decide to participate and give written consent after hearing detailed explanations about this study  Exclusion Criteria:  Patients who have been treated within the last 3 months for other serious diseases (hematologic cancer, malignancy, etc.) Patients for whom additional treatment was planned due to cancer recurrence or metastasis Patients with severe cardiopulmonary disease who are unable to proceed with rehabilitation exercise programs Patients who find it difficult to proceed with the rehabilitation exercise program due to pain caused by bone metastasis and concerns about pathological fractures Patients who underwent lower extremity artificial joint TKRA and THRA Patients who are not eligible for rehabilitation exercise as judged by medical personnel