Most deaf persons experience difficulties in mastering their reading skills, and are often faced with comprehension problems in reading text. Thus, for assisting the deaf to overcome such problems and to be able to communicate in a world of spoken languages, we present the Thai Text-Thai Sign Translation Application (T³STA). T³STA is able to translate Thai text into Thai Sign language simply and conveniently anytime, anywhere. Thai Sign language is the language of the deaf in Thailand. In the translation process, the distinction between Thai text and Thai Sign Language in both grammar and vocabulary are concerned in each processing step to ensure the accuracy of translation. It provides the meaning of each word and describes the structure formation and word order of the translated sentence. With T³STA, the deaf are able to enhance their communication ability and to improve their knowledge and learning skills. In our initial experiment, T³STA was implemented to translate sentences/phrases collected from different sources including textbooks, bedtime stories, and the public labels. T³STA was tested and evaluated in terms of translation accuracy and user satisfaction. Evaluation results show translation accuracy acceptable and satisfy users' needs.