To provide a method for manufacturing a film-shaped product, in which the film-shaped product having a nano-sized network structure on the surface thereof can be manufactured easily by an electrospray deposition process, wherein a fibrous assembly such as a nonwoven fabric manufactured by the same process, is used for investigating influences of the network structure to be exerted on the propagation or differentiation of a cell.

The film-shaped product having at least the network structure of 1 nm to 1 m diameter on the surface thereof is manufactured in the electrospray deposition process using a cellulose diacetate solution prepared by dissolving cellulose diacetate in a solvent having 57-150C boiling point.