  We present two derivations of the multiple D2 action from the multiple
M2-brane model proposed by Bagger-Lambert and Gustavsson. The first one is to
start from Lie 3-algebra associated with given (arbitrary) Lie algebra. The Lie
3-algebra metric is not positive definite but the zero-norm generators merely
correspond to Lagrange multipliers. Following the work of Mukhi and
Papageorgakis, we derive D2-brane action from the model by giving a variable a
vacuum expectation value. The second derivation is based on the correspondence
between M2 and M5. We compactify one dimension and wind M5 brane along this
direction. This leads to a noncommutative D4 action. Multiple D2 action is then
obtained by suitably choosing the non-commutative parameter on the two-torus.
It also implies a natural interpretation to the extra generator in Lie
3-algebra, namely the winding of M5 world volume around $S^1$ which defines the
reduction of M theory to \IIA superstring.
