A fundamental algorithm to simulate nanoweb morphology was developed. A nanofiber was generated by connecting beads of a fixed diameter. A single-layed nanoweb was created by repeating the nanofiber generation subroutine. The final nanoweb was constructed by superposing several layers of the simulated single-layered nanoweb. To estimate the pore size of the simulated nanoweb, an estimating algorithm was developed using a ghost particle having 0 mass and 0 volume. To assess the pore size and its distribution of the simulated nanoweb, the number of steps of the ghost particle to penetrate the web was measured.