Disclosed is a smart antenna software definition radio terminal device. A software definition radio terminal device in a smart antenna software definition radio multi antenna system according to the present invention includes: a storage unit, a microprocessor, and at least one baseband accelerator. The microprocessor is configured to select a smart antenna algorithm; receive a control command from a radio controller layer for delivering a control command to control the baseband accelerator and a radio controller layer on the basis of the selected algorithm; read from the storage unit a code including a baseband driver layer that delivers the received control command to the baseband accelerator, and execute the read code; and load at least one functional block for realizing at least one smart antenna algorithm from the storage unit into the baseband accelerator. According to the terminal device, a terminal having a modem chip of a different structure may execute the same radio application through standard API.