An ink jet system includes a recording device on which a head unit that ejects ink is mounted and that executes a recording operation on a recording medium, a processing device coupled to the recording device and performing a data process for causing the recording device to execute the recording operation, and a server configured to be coupled to either the recording device or the processing device, wherein the server authenticates a user who causes the recording device to execute the recording operation, acquires recording operation information about the recording operation from the recording device, the processing device, or a terminal device used by the user, determines reward information indicating one or a plurality of rewards based on trigger information including part of or all of the recording operation information, and grants the user one or a plurality of rewards indicated by the reward information.