1. An information processing system comprising: a plurality of processing devices each including a memory storing instructions; and one or more processors configured to execute the instructions to: store task information that indicates, for each of identifiers of one or more deployment tasks to be executed on the processing device among a plurality of deployment tasks for deploying a plurality of software components of a system respectively, an execution condition including an identifier of a dependent deployment task to be executed before executing a deployment task of the corresponding identifier, the plurality of deployment tasks being executed in the plurality of processing devices on which the plurality of software components are deployed, transmit, to a deployment device, an event subscription request including an identifier of the dependent deployment task included in the execution condition of the task information, and determine whether there is a deployment task satisfying the execution condition among the one or more deployment tasks included in the task information on the basis of a termination event of the dependent deployment task received from the deployment device, execute, when there is the deployment task satisfying the execution condition, the deployment task, and transmit, when the deployment task is terminated, a termination event of the deployment task to the deployment device; and the deployment device including a memory storing instructions; and one or more processors configured to execute the instructions to: store event information that indicates, for each of identifiers of the plurality of deployment tasks, an identifier of a processing device to which a termination event of the deployment task of the corresponding identifier is to be transmitted based on the event subscription request; and transmit, when receiving a termination event of a deployment task from any one of the plurality of processing devices, the received termination event to a processing device to which the termination event of the deployment task is to be transmitted, referring to the event information.