An information processing apparatus comprising: a control unit including a first clock device for providing a time of day; and a plurality of system boards (110, 210) each including a second clock device (111, 211) for providing a time of day and each configured to implement at least one logical domain that functions as a virtual information processing apparatus, wherein the control unit is configured to control a first time-of-day difference between the time of day on the second clock device (111, 211) of each system board (110, 210) and the time of day on the first clock device, wherein each system board (110, 210) is configured to manage a second time-of-day difference between a time of day on a logical domain implemented on the system board (110, 210) and the time of day on the second clock device (111, 211) of the system board (110, 210), wherein the information processing apparatus is configured to control the time of day on the logical domain implemented on each of the plurality of system boards (110, 210) based on the first time-of-day difference and the second time-of-day difference, wherein the control unit is configured to provide information on the time of day on a logical domain implemented by a first system board to the first system board when the first system board is started up, the information being generated based on the first time-of-day difference for the first system board and the second time-of-day difference for the logical domain notified when the logical domain was previously stopped, wherein the first system board and a second system board are configured to implement a hypervisor by each executing a hypervisor program and communicating with each other, the hypervisor storing the second time-of-day differences, and wherein when the logical domain migrates from the first system board to the second system board, the control unit is configured to provide a discrepancy between respective first time-of-day differences of the first and second system boards (110, 210) to the hypervisor, and the hypervisor is configured to update the second time-of-day difference for the logical domain according to the discrepancy. a control unit including a first clock device for providing a time of day; and a plurality of system boards (110, 210) each including a second clock device (111, 211) for providing a time of day and each configured to implement at least one logical domain that functions as a virtual information processing apparatus, wherein the control unit is configured to control a first time-of-day difference between the time of day on the second clock device (111, 211) of each system board (110, 210) and the time of day on the first clock device, wherein each system board (110, 210) is configured to manage a second time-of-day difference between a time of day on a logical domain implemented on the system board (110, 210) and the time of day on the second clock device (111, 211) of the system board (110, 210), wherein the information processing apparatus is configured to control the time of day on the logical domain implemented on each of the plurality of system boards (110, 210) based on the first time-of-day difference and the second time-of-day difference, wherein the control unit is configured to provide information on the time of day on a logical domain implemented by a first system board to the first system board when the first system board is started up, the information being generated based on the first time-of-day difference for the first system board and the second time-of-day difference for the logical domain notified when the logical domain was previously stopped, wherein the first system board and a second system board are configured to implement a hypervisor by each executing a hypervisor program and communicating with each other, the hypervisor storing the second time-of-day differences, and wherein when the logical domain migrates from the first system board to the second system board, the control unit is configured to provide a discrepancy between respective first time-of-day differences of the first and second system boards (110, 210) to the hypervisor, and the hypervisor is configured to update the second time-of-day difference for the logical domain according to the discrepancy.