Infinite-dimensional geometry and quantum field theory of strings .2. Infinite-dimensional noncommutative geometry of a self-interacting string field

A geometric interpretation of quantum self-interacting string field theory is given. Relationships between various approaches to the second quantization of an interacting string are described in terms of geometric quantization. An algorithm for constructing a quantum nonperturbative interacting string field theory in the quantum group formalism is suggested. Problems of a metric background (in)dependence are discussed.