Communication system and bandwidth control method

A communication system comprising:

• a first virtual customer premises equipment (CPE) capable of providing a network function to a first CPE;
• and
• a second virtual CPE capable of providing a network function to a second CPE,
• wherein the first virtual CPE comprises:
• a band acquisition unit configured to acquire a first contract band set for a first subscriber under control of the first CPE and acquire a value of decrease in the first contract band when at least one subscriber terminal of the first subscriber transitions from being under control of the first CPE to being under control of the second CPE, and
• a band control unit configured to control a communication band for the first CPE using a band value obtained by subtracting the value of decrease from the first contract band, and configured to receive a first notification from a server to change the band value of the first contract band when an application start time is reached and a second notification from the server to restore a band value of the first contract band when an application end time is reached, and
• wherein the second virtual CPE comprises:
• band acquisition unit configured to acquire a second contract band set for a second subscriber under control of the second CPE and acquire a value of increase in the second contract band corresponding to the value of decrease in the first contract band, and
• a band control unit configured to control a communication band for the second CPE using a band value obtained by adding the value of increase to the second contract band, wherein the value of increase is determined based on the value of decrease and a service quality associated with the first subscriber under control of the first CPE and a second subscriber under control of the second CPE.