This paper details the full design, implementation and validation of an e-health service in order to improve the community health care services for patients with cognitive disorders. Specifically, the new service allows Parkinson's disease patients benefit from the possibility of doing Cognitive Stimulation Therapy at home by using a familiar device such as a TV set. Its use instead a PC could be a major advantage for some patients whose lack of familiarity with the use of a PC means that they can do therapy only in the presence of a therapist. For these patients this solution could bring about a great improvement in their autonomy. At the same time, this service provides therapists with the ability to conduct follow-up of therapy sessions via the web, benefiting from greater and easier control of the therapy exercises performed by patients and allowing them to customize new exercises in accordance with the particular needs of each patient. As a result, this kind of cognitive stimulation therapy is considered to be a complement of other therapies oriented to Parkinson patients. Further, with small changes, the system could be useful for patients with a different cognitive disease such as Alzheimers or Mild Cognitive Impairment.