In a management system, an acquisition unit acquires information regarding adjustment of an amount of resources to be used for a first processing system according to an instruction for switching a processing system that processes a request transmitted from a predetermined network system. An adjustment instruction unit issues an instruction for increasing the number of virtual machines in a second processing system as an adjustment instruction to adjust an amount of resources in the second processing system based on this acquired information. The processing system that processes the request transmitted from the predetermined network system is switched according to this adjustment instruction.