The composite substrate is a substrate used to manufacture an acoustic wave device, and includes a support substrate, a piezoelectric substrate, and a adhesive layer with which the support substrate and the piezoelectric substrate are bonded to each other. By this method, a primary amine compound can be commercially advantageously produced by using a low-cost ammonia while suppressing production of a secondary amine as a by-product. Network performance parameters, for example, call set-up time, may be used to determine the optimum number of hierarchical levels for a given PNNI network. Respective, target search ranges are determined for the multiple search expressions such that a number of records to be searched with each of the multiple search expressions is approximately constant.