Gas filling system

A gas filling system configured to connect to a high pressure container and fill the high pressure container with gas, the gas filling system comprising:

• a receiver configured to receive a temperature in the high pressure container measured by a temperature sensor through communication;
• a flow rate control device configured to control a flow rate of the gas for filling;
• a pressure sensor configured to measure a pressure of the gas for filling;
• and
• a controller configured to calculate a filling rate of the gas in the high pressure container based on the temperature received by the receiver and the pressure measured by the pressure sensor, and control a pressure rise rate of the gas with which the high pressure container is filled by controlling the flow rate control device,
• wherein the controller is configured to control the flow rate control device such that the high pressure container is filled with the gas at a preset first pressure rise rate, until the filling rate of the high pressure container reaches a preset first target filling rate, and the high pressure container is filled with the gas at a preset second pressure rise rate lower than the first pressure rise rate, until the filling rate of the high pressure container reaches, from the first target filling rate, a preset second target filling rate higher than the first target filling rate.