This invention is about WCTS Server System, WCTS Terminal and Method to provide Caption Telephone Service. By using voice in wireless and data network, WCTS Sever System provides Wireless Captioned Telephone Service, WCTS), which is one of Telecommunication Relay Service Types. This invention provides convenience by providing the same method of non-handicapped person with WCTS terminal when a deaf person who can speak is speaking on the phone with non-handicapped person. On the other hand, this invention also provides the method of direct dialing to a deaf person who can speak, not the method of indirect dialing that uses representative number of relay center.