A liquid supply system supplying a liquid to a printer, the liquid supply system comprising: one or a plurality of supply tubes configuring a supply flow path (W0; W10; W20; W30; S0) of the liquid to the printer, the one or plurality of supply tubes being connected to a tank configured to store the liquid, the tank being provided further upstream than the printer in the supply flow path, and the one or plurality of supply tubes configured to supply the liquid from the tank toward the printer; a supply mechanism (20, 21, 22, 23) being a mechanism provided in the one or plurality of supply tubes and configured to switch between a supply state of supplying the liquid from the tank toward the printer via the one or plurality of supply tubes, and a supply stopped state of stopping the liquid from being supplied from the tank toward the printer via the one or plurality of supply tubes; a first sensor configured to detect a server remaining amount, the server remaining amount being a remaining amount of the liquid inside the tank; and a processor (41; 51), characterized in that the processor performs determination processing of determining, based on a signal from the first sensor, whether the server remaining amount is equal to or less than a predetermined remaining amount, and supply processing of supplying the liquid from the tank toward the printer via the one or plurality of supply tubes, by controlling the supply mechanism to be in the supply state, when the server remaining amount indicated by the signal from the first sensor is determined by the determination processing to be equal to or less than the predetermined remaining amount. one or a plurality of supply tubes configuring a supply flow path (W0; W10; W20; W30; S0) of the liquid to the printer, the one or plurality of supply tubes being connected to a tank configured to store the liquid, the tank being provided further upstream than the printer in the supply flow path, and the one or plurality of supply tubes configured to supply the liquid from the tank toward the printer; a supply mechanism (20, 21, 22, 23) being a mechanism provided in the one or plurality of supply tubes and configured to switch between a supply state of supplying the liquid from the tank toward the printer via the one or plurality of supply tubes, and a supply stopped state of stopping the liquid from being supplied from the tank toward the printer via the one or plurality of supply tubes; a first sensor configured to detect a server remaining amount, the server remaining amount being a remaining amount of the liquid inside the tank; and a processor (41; 51), characterized in that the processor performs determination processing of determining, based on a signal from the first sensor, whether the server remaining amount is equal to or less than a predetermined remaining amount, and supply processing of supplying the liquid from the tank toward the printer via the one or plurality of supply tubes, by controlling the supply mechanism to be in the supply state, when the server remaining amount indicated by the signal from the first sensor is determined by the determination processing to be equal to or less than the predetermined remaining amount. determination processing of determining, based on a signal from the first sensor, whether the server remaining amount is equal to or less than a predetermined remaining amount, and supply processing of supplying the liquid from the tank toward the printer via the one or plurality of supply tubes, by controlling the supply mechanism to be in the supply state, when the server remaining amount indicated by the signal from the first sensor is determined by the determination processing to be equal to or less than the predetermined remaining amount.