PROBLEM TO BE SOLVED: To improve operability.SOLUTION: A plant operation support apparatus 100 comprises display means 211 and reception means 212. The display means 211 displays a plurality of columns capable of being allocated with processing information indicating processing executed in a plant in accordance with an arrangement rule predetermined in accordance with processing flow and displays input processing information indicating processing input with information from the plant, intermediate processing information executed by using processing results of the processing information and output processing information outputting the processing results as diagnostic results of the plant. The reception means 212 receives operation allocating the processing information to each of the plurality of columns displayed by the display means and receives operation connecting between a first column allocated with first processing information and a second column allocated with second processing information using processing results by the first processing information. The reception means 212 receives operation connecting between the first column and the second column by a connection line with an arrow directed to a first direction side as the operation connecting between the first column and the second column.
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