Communication system and communication method

A communication system, comprising:

• a network slice being a virtual logical network provided on a physical resource;
• a slice gateway (SLG) provided at an end of the network slice;
• and a virtualized customer premieres equipment (vCPE) configured to accommodate a terminal,
• wherein the SLG includes a plurality of the SLGs, and
• the SLG includes:
• a selection unit, including one or more processors, configured to select, in receiving a network slice reservation request including a network condition from the vCPE, based on topology information, a latency state, and processing capability information regarding each of the other SLGs, a destination SLG of a network slice satisfying the network condition to reserve the network slice, and if there is no destination SLG satisfying the network condition, configured to newly activate a destination SLG to establish a network slice satisfying the network condition;
• and
• an allocation unit, including one or more processors, configured to allocate traffic transmitted from the vCPE to the network slice reserved or established by the selection unit.