An edge computing method for flexibly allocating a computing resource includes receiving an edge module and a container resource allocation value, generating a container based on the container resource allocation value and arranging the edge module in the generated container. The edge module is distributed to an edge computing device to perform a predetermined data processing. The container is a software component of the edge computing device providing an isolated computing environment for driving the edge module. The edge computing device is installed on-premise. The edge computing device can flexibly adjust available computing resources according to the current working situation and a resource requirement. In response to an environment, in which data traffic is flexible according to time or situation, such as a manufacturing plant, allocated resources of the edge computing device can be quickly adjusted, thereby a stable service can be provided.