  We propose a method to define a $d+1$ dimensional geometry from a $d$
dimensional quantum field theory in the $1/N$ expansion. We first construct a
$d+1$ dimensional field theory from the $d$ dimensional one via the gradient
flow equation, whose flow time $t$ represents the energy scale of the system
such that $t\rightarrow 0$ corresponds to the ultra-violet (UV) while
$t\rightarrow\infty$ to the infra-red (IR). We then define the induced metric
from $d+1$ dimensional field operators. We show that the metric defined in this
way becomes classical in the large $N$ limit, in a sense that quantum
fluctuations of the metric are suppressed as $1/N$ due to the large $N$
factorization property. As a concrete example, we apply our method to the O(N)
non-linear $\sigma$ model in two dimensions. We calculate the three dimensional
induced metric, which is shown to describe an AdS space in the massless limit.
We finally discuss several open issues in future studies.
