A network system, a network control method, and a control apparatus are provided that can optimize the deployment of virtual network functions. A network control apparatus (10) monitors virtual components (VMM, VM, VNF) on a physical server and physical components (SV, 21A, 21 B, 21C) of a network and, based on network topology information concerning these components, manages at least one virtual network function (VNF) operating on the physical server, and performs setting control on at least one of the virtual components and the physical components so as to solve a problem when the problem occurs at at least one component on at least one of layers operating on the physical server.