  We present statistics of $z\sim 6-9$ galaxy outflows indicated by
spatially-extended gas emission and broad lines. With a total of 61
spectroscopically confirmed galaxies at $z\sim 6-9$ in the JWST CEERS, GLASS,
and ERO data, we find four galaxies with [O{\sc iii}]+H$\beta$ ionized gas
emission significantly extended beyond the kpc-scale stellar components on the
basis of the emission line images constructed by the subtraction of NIRCam
broadband (line on/off-band) images. By comparison with low-$z$ galaxies, the
fraction of galaxies with the spatially extended gas, 4/18, at $z\sim 6-9$ is
an order of magnitude higher than those at $z\sim 0-1$, which can be explained
by events triggered by frequent major mergers at high redshift. We also
investigate medium- and high-resolution NIRSpec spectra of 30 galaxies at
$z\sim 6-9$, and identify five galaxies with broad ($140-800$ km s$^{-1}$)
lines in the [O{\sc iii}] forbidden line emission, suggestive of galaxy
outflows. One galaxy at $z=6.38$ shows both the spatially-extended gas emission
and the broad lines, while none of the galaxies with the spatially-extended gas
emission or broad lines present a clear signature of AGN either in the line
diagnostics or Type 1 AGN line broadening ($>1000$ km s$^{-1}$), which hint
outflows mainly driven by stellar feedback. The existence of galaxies
with/without spatially-extended gas emission or broad lines may be explained by
different viewing angles towards outflows, or that these are galaxies in the
early, late, post phases of galaxy outflows at high redshift, where the
relatively large fractions of such galaxies indicate the longer-duration and/or
more-frequent outflows at the early cosmic epoch.
