1. A computer comprising a processor and a memory coupled to the processor, configured to execute a process by using correlation matrix data which includes a plurality of elements each of which is a value indicating correlation between a plurality of indicators, wherein the computer comprises a graph generation unit configured to generate graph data from the correlation matrix data obtained from a storage apparatus, the graph data includes a plurality of vertexes each of which corresponds to an indicator, a plurality of edges each of which connects two of vertexes having correlation, and a plurality of weights of the plurality of edges each of which indicates a value of a element, wherein the graph process unit includes: a control factor calculation unit configured to calculate a control factor for generating compressed graph data based on a constraint condition on a process by using the correlation matrix data; and a graph generation unit configured to generate the graph data from the correlation matrix data by using the control factor, wherein the control factor calculation unit is configured to: obtain a target process time which is a completion time for the process by using the correlation matrix data, as the constraint condition; calculate a maximum of a number of edges to be included in the graph data to complete a process within the target process time; calculate a threshold for extracting the plurality of elements converted from the correlation matrix data to the graph data based on the maximum of the number of edges; and output the threshold as the control factor to the graph data generation unit, and wherein the graph generation unit is configured to: extract at least one of the plurality of elements from the correlation matrix data based on the threshold, and generate the graph data by generating information of the plurality of vertexes, the plurality of edges, and the plurality of weights of the plurality of edges based on a combination of the plurality of indicators for identifying the extracted at least one of the plurality of elements and a value of the at least one of the plurality of elements.