A computer supports an operation by an operator of a target device. The computer stores a first topology indicating dependency relationship of a plurality of device types including a device type of the target device. The computer generates a second topology indicating dependency relationship of a plurality of devices including the target device, by performing, based on the first topology, a topology discovery for the plurality of devices. Each of the plurality of devices has any one of the plurality of device types. The computer provides an operation sequence of the plurality of devices to the operator. The operation sequence is generated based on the second topology.