A non-transitory computer-readable storage medium storing a program that causes a first computer to execute a process, the process including, receiving an update request from a second computer, the update request including an identifier of data stored in a storage device, an arithmetic operator of a calculation for the data, and an argument value used for the calculation, the calculation being one of four arithmetic calculation and bit calculation, the data being stored in the storage device that denies an access from the second computer, executing the calculation for a value of the data based on the arithmetic operator and the argument value, the calculation executed by the first computer being limited to the four arithmetic calculation or the bit calculation, updating the value of the data to an output value of the executed calculation, and transmitting response information corresponding to the update request to the second computer.