  We report a multiplanetary system found from the analysis of microlensing
event OGLE-2018-BLG-1011, for which the light curve exhibits a double-bump
anomaly around the peak. We find that the anomaly cannot be fully explained by
the binary-lens or binary-source interpretations and its description requires
the introduction of an additional lens component. The 3L1S (3 lens components
and a single source) modeling yields three sets of solutions, in which one set
of solutions indicates that the lens is a planetary system in a binary, while
the other two sets imply that the lens is a multiplanetary system. By
investigating the fits of the individual models to the detailed light curve
structure, we find that the multiple-planet solution with planet-to-host mass
ratios $\sim 9.5\times 10^{-3}$ and $\sim 15\times 10^{-3}$ are favored over
the other solutions. From the Bayesian analysis, we find that the lens is
composed of two planets with masses $1.8^{+3..4}_{-1.1}~M_{\rm J}$ and
$2.8^{+5.1}_{-1.7}~M_{\rm J}$ around a host with a mass
$0.18^{+0.33}_{-0.10}~M_\odot$ and located at a distance
$7.1^{+1.1}_{-1.5}~{\rm kpc}$. The estimated distance indicates that the lens
is the farthest system among the known multiplanetary systems. The projected
planet-host separations are $a_{\perp,2}=1.8^{+2.1}_{-1.5}~{\rm au}$
($0.8^{+0.9}_{-0.6}~{\rm au}$) and $a_{\perp,3}=0.8^{+0.9}_{-0.6}~{\rm au}$,
where the values of $a_{\perp,2}$ in and out the parenthesis are the
separations corresponding to the two degenerate solutions, indicating that both
planets are located beyond the snow line of the host, as with the other four
multiplanetary systems previously found by microlensing.
