The aim of study was to assess the effectiveness of dementia elderly persons on the cognitive function, Activities of Daily Living(ADL) and balance-performing ability the group therapeutic exercise programs. Fifteen community-dwelling subjects participated in this study. An 4-week group therapeutic exercise program, including strengthening and balance training, breathing and gait exercise, and recreation, consisted of activities related to daily living. The Mini-Mental State Examination-korean(MMSE-K), Modified Barthel Index(MBI), Berg Balance Scale(BBS), and Timed Up & Go (TUG) test were measured during before and after exercise points The results of this study were as follows : 1) After eight weeks, the MMSE-K and MBI total scores were significantly increased to more after than before(p<.05, p<.01). 2) in the MBI contents, personal hygiene, dressing, ambulation and chair, bed transfers scores were significant increased to after. 3) after BBS, TUG scores were statistically significant higher than the before scores(p<.05, p<.05, p<.01). These findings suggest that group therapeutic exercise program can be used to improve the cognitive function, ADL and balance-performing ability in dementia elderly persons.