  We present the behavior of the magnetic field and activity indicators of the
single late-type giant Beta Ceti in the period June 19, 2010 - December 14,
2010. We used spectropolarimetric data obtained with two telescopes - the
NARVAL spectropolarimeter at Telescope Bernard Lyot, Pic du Midi, France and
the ESPaDOnS spectropolarimeter at CFHT, Hawaii. The data were processed using
the method of Least Square Deconvolution which enables to derive the mean
photospheric profiles of Stokes I and V parameters. We measured the
surface-averaged longitudinal magnetic field Bl, which varies in the interval
0.1 - 8.2 G, the line activity indicators CaII K, H_alpha, CaII IR (854.2 nm)
and radial velocity. By analyzing the Bl variations, was identified a possible
rotational period P = 118 days. A single, large magnetic spot which dominates
the field topology is a possible explanation for the Bl and activity indicator
variations of Beta Ceti.
