  At the future $e^{+}e^{-}$ linear collider ILC/CLIC it will be able to
measure the photon structure functions in a wider range of kinematic variables
x and $Q^{2}$ in comparison to the previous results of experiments at LEP. The
classical way to measure the photon structure functions is the study of
$e^{+}e^{-} \rightarrow e^{+}e^{-} {\gamma}{\gamma} \rightarrow e^{+}e^{-}$ X
process, where X is the leptonic or hadronic final state. For the study of the
QED and hadronic photon structure functions the simulations of two-photon
processes were performed at the ILC center-of-mass energy equal to 500 GeV
using the PYTHIA and the ILCSoft package. The analysis used information related
to the forward detectors, tracking detectors and calorimeters which are parts
of the ILD detector concept.
