  In the narrow-line Seyfert 1 galaxy 1H 0707-495, recently a transient
quasi-periodic oscillation (QPO) signal with a frequency of $\sim 2.6\times
10^{-4}$ Hz has been detected at a high statistical significance. Here, we
reanalyze the same set of XMM-Newton data observed on 2008 February 4 with the
Weighted-Wavelet Z-transform (WWZ) method. In addition to confirming the
previous findings, we also find another QPO signal with a frequency of $\sim
1.2\times 10^{-4}$ Hz in a separated X-ray emission phase at the significance
level of $\sim 3.7\sigma$. The signal is also found fitting an auto-regressive
model though at a lower significance. The frequency ratio between these two
signals is $\sim 2:1$. The analysis of other XMM-Newton measurements of 1H
0707-495 also reveals the presence of the $\sim 2.6\times 10^{-4}$ Hz ($\sim
1.2\times 10^{-4}$ Hz) QPO signal on 2007 May 14 (2010 September 17) at the
significance level of $\sim 4.2\sigma$ ($\sim 3.5\sigma$). The QPO frequency
found in this work follows the $f_{QPO}-M_{BH}$ relation reported in previous
works spanning from stellar-mass to supermassive black holes. This is the first
time to observe two separated transient X-ray QPO signals in active galactic
nuclei (AGNs), which sheds new light on the physics of accreting supermassive
black holes.
