A chart creation method to be used in a system including an image forming apparatus and a control apparatus which controls the image forming apparatus, the image forming apparatus including a print section and a color measurement section (33, 36), the method comprising: first creating a chart, including creating, by the control apparatus, a print image of a chart in which a plurality of color patches are arranged, giving, from the control apparatus, instructions to the image forming apparatus to print the chart and measure colors of the chart, and printing the chart and measuring colors of the chart by the image forming apparatus; performing rearrangement of the plurality of color patches of the chart by the control apparatus, the rearrangement including obtaining measured color values of the plurality of color patches of the chart from the image forming apparatus, and rearranging the plurality of color patches of the chart so as to restrict spread of average color values calculated for subgroups of color patches in the chart within a predetermined range, by calculating the average color values for the subgroups of the color patches in the chart while successively exchanging the measured color values between a pair of the color patches in the chart, the subgroups each consisting of one color patch and at least one neighboring color patch of the one color patch out of the plurality of color patches of the chart, the average color values each being an average of measured color values of color patches forming one of the subgroups; and second creating a chart with the rearranged color patches, including creating, by the control apparatus, a print image of a chart including the rearranged color patches, giving, from the control apparatus, instructions to the image forming apparatus to print the chart including the rearranged color patches and measure colors of the chart, and printing the chart including the rearranged color patches and measuring colors of the chart by the image forming apparatus. first creating a chart, including creating, by the control apparatus, a print image of a chart in which a plurality of color patches are arranged, giving, from the control apparatus, instructions to the image forming apparatus to print the chart and measure colors of the chart, and printing the chart and measuring colors of the chart by the image forming apparatus; creating, by the control apparatus, a print image of a chart in which a plurality of color patches are arranged, giving, from the control apparatus, instructions to the image forming apparatus to print the chart and measure colors of the chart, and printing the chart and measuring colors of the chart by the image forming apparatus; performing rearrangement of the plurality of color patches of the chart by the control apparatus, the rearrangement including obtaining measured color values of the plurality of color patches of the chart from the image forming apparatus, and rearranging the plurality of color patches of the chart so as to restrict spread of average color values calculated for subgroups of color patches in the chart within a predetermined range, by calculating the average color values for the subgroups of the color patches in the chart while successively exchanging the measured color values between a pair of the color patches in the chart, the subgroups each consisting of one color patch and at least one neighboring color patch of the one color patch out of the plurality of color patches of the chart, the average color values each being an average of measured color values of color patches forming one of the subgroups; and obtaining measured color values of the plurality of color patches of the chart from the image forming apparatus, and rearranging the plurality of color patches of the chart so as to restrict spread of average color values calculated for subgroups of color patches in the chart within a predetermined range, by calculating the average color values for the subgroups of the color patches in the chart while successively exchanging the measured color values between a pair of the color patches in the chart, the subgroups each consisting of one color patch and at least one neighboring color patch of the one color patch out of the plurality of color patches of the chart, the average color values each being an average of measured color values of color patches forming one of the subgroups; and second creating a chart with the rearranged color patches, including creating, by the control apparatus, a print image of a chart including the rearranged color patches, giving, from the control apparatus, instructions to the image forming apparatus to print the chart including the rearranged color patches and measure colors of the chart, and printing the chart including the rearranged color patches and measuring colors of the chart by the image forming apparatus. creating, by the control apparatus, a print image of a chart including the rearranged color patches, giving, from the control apparatus, instructions to the image forming apparatus to print the chart including the rearranged color patches and measure colors of the chart, and printing the chart including the rearranged color patches and measuring colors of the chart by the image forming apparatus.