An apparatus for converting luminance of an image, comprising: an obtainer for obtaining a first luminance signal which is a luminance signal of the image; a converter for (i) converting a first code value included in the first luminance signal into a first luminance value using a first Electro-Optical Transfer Function (EOTF) that indicates a relationship between a luminance value in a first luminance range and a code value; (ii) converting the first luminance value into a second luminance value associated with the first luminance value in advance in a second luminance range; and (iii) converting the second luminance value into a second code value using a second EOTF that indicates a relationship between a luminance value in the second luminance range different in a maximum value from the first luminance range and a code value; and an output unit for outputting a second luminance signal including the second code value, wherein the first luminance range is larger in a maximum luminance value than the second luminance range, when the first luminance value is in a low luminance region of the first luminance range, the converter converts the first luminance value into the second luminance value whose luminance value is approximately equal to the first luminance value; when the first luminance value is in a high luminance region of the first luminance range, the converter converts the first luminance value into the second luminance value so that the larger the first luminance value is, the smaller an increase amount of the luminance value is; when the decided first luminance value is the maximum luminance value in the first luminance range, the maximum luminance value in the second luminance range is the second luminance value; the converter decides a conversion method from the first luminance value into the second luminance value according to a scene of the image; and in said deciding, the converter is configured to select relational information according to the scene of the image from a plurality of pieces of relational information representing relationships between the luminance value in the first luminance range and the luminance value in the second luminance range, and the second luminance value is decided based on the decided first luminance value by using the selected relational information. an obtainer for obtaining a first luminance signal which is a luminance signal of the image; a converter for (i) converting a first code value included in the first luminance signal into a first luminance value using a first Electro-Optical Transfer Function (EOTF) that indicates a relationship between a luminance value in a first luminance range and a code value; (ii) converting the first luminance value into a second luminance value associated with the first luminance value in advance in a second luminance range; and (iii) converting the second luminance value into a second code value using a second EOTF that indicates a relationship between a luminance value in the second luminance range different in a maximum value from the first luminance range and a code value; and (i) converting a first code value included in the first luminance signal into a first luminance value using a first Electro-Optical Transfer Function (EOTF) that indicates a relationship between a luminance value in a first luminance range and a code value; (ii) converting the first luminance value into a second luminance value associated with the first luminance value in advance in a second luminance range; and (iii) converting the second luminance value into a second code value using a second EOTF that indicates a relationship between a luminance value in the second luminance range different in a maximum value from the first luminance range and a code value; and an output unit for outputting a second luminance signal including the second code value, wherein the first luminance range is larger in a maximum luminance value than the second luminance range, when the first luminance value is in a low luminance region of the first luminance range, the converter converts the first luminance value into the second luminance value whose luminance value is approximately equal to the first luminance value; when the first luminance value is in a high luminance region of the first luminance range, the converter converts the first luminance value into the second luminance value so that the larger the first luminance value is, the smaller an increase amount of the luminance value is; when the decided first luminance value is the maximum luminance value in the first luminance range, the maximum luminance value in the second luminance range is the second luminance value; the converter decides a conversion method from the first luminance value into the second luminance value according to a scene of the image; and in said deciding, the converter is configured to select relational information according to the scene of the image from a plurality of pieces of relational information representing relationships between the luminance value in the first luminance range and the luminance value in the second luminance range, and the second luminance value is decided based on the decided first luminance value by using the selected relational information.