A liquid ejection apparatus comprising: a liquid container for containing liquid which has a refilling port for refilling the liquid container with liquid contained in an external container; a contained liquid information memory unit for storing information on the liquid contained in the liquid container; a refilling liquid information memory unit for storing information on the liquid contained in the external container that is to be supplied for refilling the liquid container, a liquid ejection head for ejecting the liquid supplied from the liquid container; and a control unit for controlling an operation of the liquid ejection apparatus according to the information stored in the contained liquid information memory unit and the information stored in the refilling liquid information memory unit; characterized in that the control unit obtains, by calculation, information relating to an evaporation rate of the liquid contained in the liquid container, from information relating to a used quantity and a retention period of the liquid contained in the liquid container or an evaporation rate of the liquid, which is stored in the contained liquid information memory unit, and information relating to a refilling quantity and an elapsed time since the last supply of the liquid to be supplied for refilling the liquid container or an evaporation rate of the liquid, which is stored in the refilling liquid information memory unit; and the control unit is adapted to control the operation of the liquid ejection apparatus, in a case where the calculated information relating to the evaporation rate of the liquid contained in the liquid container indicates an evaporation rate of the liquid contained in the liquid container which is higher than a first predetermined threshold value, by adjusting conditions of liquid ejection after a liquid refilling operation. a liquid container for containing liquid which has a refilling port for refilling the liquid container with liquid contained in an external container; a contained liquid information memory unit for storing information on the liquid contained in the liquid container; a refilling liquid information memory unit for storing information on the liquid contained in the external container that is to be supplied for refilling the liquid container, a liquid ejection head for ejecting the liquid supplied from the liquid container; and a control unit for controlling an operation of the liquid ejection apparatus according to the information stored in the contained liquid information memory unit and the information stored in the refilling liquid information memory unit; characterized in that the control unit obtains, by calculation, information relating to an evaporation rate of the liquid contained in the liquid container, from information relating to a used quantity and a retention period of the liquid contained in the liquid container or an evaporation rate of the liquid, which is stored in the contained liquid information memory unit, and information relating to a refilling quantity and an elapsed time since the last supply of the liquid to be supplied for refilling the liquid container or an evaporation rate of the liquid, which is stored in the refilling liquid information memory unit; and the control unit is adapted to control the operation of the liquid ejection apparatus, in a case where the calculated information relating to the evaporation rate of the liquid contained in the liquid container indicates an evaporation rate of the liquid contained in the liquid container which is higher than a first predetermined threshold value, by adjusting conditions of liquid ejection after a liquid refilling operation.