A cryopump system includes a cryopump, a compressor of a working gas for the cryopump, a control device configured to control an operation frequency of the compressor, a gas line connecting the cryopump and the compressor, and a gas quantity adjustment unit configured to switch a working gas quantity of the gas line between at least a first gas quantity and a second gas quantity. When the gas line has the first gas quantity, a controllable range of the operation frequency provides a first flow rate range of the working gas. When the gas line has the second gas quantity, the controllable range provides a second flow rate range of the working gas. The second flow rate range has a non-overlapping portion with the first flow rate range.