  We have developed a new gravitaional-wave (GW) detector, TOrsion-Bar Antenna
(TOBA), with multiple-output configuration. TOBA is a detector with bar-shaped
test masses that rotate by the tidal force of the GWs. In our detector, three
independent information about the GW signals can be derived by monitoring
multiple rotational degrees of freedom, i.e., horizontal rotations and vertical
rotations of the bars. Since the three outputs have different antenna pattern
functions, the multi-output system improves the detection rate and the
parameter estimation accuracy. It is effective in order to obtain further
details of the GW sources, such as population and directions. We successfully
operated the multi-output detector continuously for more than 24 hours with
stable data quality. Also, the sensitivity of one of the signals is improved to
be $1 \times 10^{-10}$ ${\rm Hz}^{-1/2}$ at 3 Hz by the combination of the
passive and active vibration isolation systems, while sensitivities to possible
GW signals derived from the vertical rotations are worse than that from the
horizontal rotation.
