Each time data is migrated, a management system stores information denoting a migration history related to the migration of the data, in history management information. The metadata describes a number of artifacts of the computer application. The safety valve device 101 includes a valve member 110 having a protruding wall 118 forming a valve internal space C communicated with a release hole 122 and has a hydrogen leakage function for allowing leakage of hydrogen gas in the case 102 out of the battery through the valve internal space C even when the internal pressure in the case 102 is the predetermined value or less. , from an application via an API. In this respect, a catalytic afterburner is associated with every single fuel cell or with a group formed of a plurality of fuel cells and the afterburners are arranged so that exhaust gas discharged from a fuel cell at the anode side or at the cathode side can enter directly into an afterburner. The void volume space allows this migration of fluid to occur without the fluid coming into contact with the topsheet, thereby avoiding a feeling of wetness for a wearer.