  Few parameters dependent generalised entropy includes Tsallis entropy,
R{\'e}nyi entropy, Sharma-Mittal entropy, Barrow entropy, Kaniadakis entropy,
etc as particular representatives. Its relation to physical systems is not
always clear. In this paper, we propose the microscopic thermodynamic
description for an arbitrary generalised entropy in terms of the particle
system. It is shown that the change in the volume of the phase space of the
particle system in the micro-canonical description or the difference in the
integration measure in the phase space in the canonical description may lead to
generalised entropy. Our consideration may help us understand the structure of
quantum gravity.
