Abstract: A point-to-multipoint network system using an in-house telephone line includes a master modem and a plurality of slave modems. The master modem is configured to allocate at least of a plurality of downstream bandwidths (hereinafter, referred to as a first bandwidth) and configured to allocate at least of a plurality of upstream bandwidths (hereinafter, referred to as a second bandwidth). The first bandwidth is capable of including non-contiguous frequency spaces and the second band is capable of including non-contiguous frequency spaces. The plurality of the slave modems are configured to respectively communicate with the master modem through the first and second bandwidths by using the in-house telephone line.