Provided are a group selector 431 configured to select collection groups from multiple subgroups obtained by dividing a memory area in a first storage unit 411b; a collection group assigner 432 configured to assign the selected collection groups to data collection apparatuses 41 to 43 in order to distribute load of data collection; and a schedule generator 433 configured to generate a schedule for reading the data from the first storage unit 411b. Each of the data collection apparatuses 42, 43 includes a schedule generator 443 configured to generate a schedule for reading the data from the first storage unit 411b on the basis of a collection cycle and the number of collection groups assigned to the data collection apparatus 42.