A maintenance operation assistance system, comprising: a failure knowledge database in which failure knowledge data regarding a failure of an asset is recorded; characterized by a failure knowledge coupling unit that is configured to reconstruct, as integrated failure knowledge data, a plurality of instances of partial failure knowledge data which are instances of the failure knowledge data created by being partially divided; and an inspection procedure generation unit that is configured to present an inspection procedure to a maintenance operator by using the integrated failure knowledge data, wherein the failure knowledge coupling unit is configured to evaluate and adjust a relatedness between description contents of instances of different partial failure knowledge data in a graph format using nodes among the plurality of instances of partial failure knowledge data, and to generate the failure knowledge data after reconstruction by connecting the instances of different partial failure knowledge data, and the inspection procedure generation unit is configured to set priorities when the inspection procedure is presented to the maintenance operator by the inspection procedure generation unit a after reconstruction, and to present the inspection procedure to a diagnostic interface unit based on the priorities, wherein the failure knowledge data describes a failure candidate of the asset and a related phenomenon and describes a knowledge having a configuration in which structural and functional configurations of the asset have no inconsistency or duplication as a whole, wherein the instances of partial failure knowledge data include information regarding a target component of the asset, a failure mode, a failure cause causing the failure mode, and a failure effect due to the failure mode, wherein the failure knowledge coupling unit is configured to calculate a score indicating a coincidence between types of the nodes, and wherein the inspection procedure generation unit is configured to change the priorities based on degrees of enrichment of the instances of partial failure knowledge data. a failure knowledge database in which failure knowledge data regarding a failure of an asset is recorded; characterized by a failure knowledge coupling unit that is configured to reconstruct, as integrated failure knowledge data, a plurality of instances of partial failure knowledge data which are instances of the failure knowledge data created by being partially divided; and an inspection procedure generation unit that is configured to present an inspection procedure to a maintenance operator by using the integrated failure knowledge data, wherein the failure knowledge coupling unit is configured to evaluate and adjust a relatedness between description contents of instances of different partial failure knowledge data in a graph format using nodes among the plurality of instances of partial failure knowledge data, and to generate the failure knowledge data after reconstruction by connecting the instances of different partial failure knowledge data, and the inspection procedure generation unit is configured to set priorities when the inspection procedure is presented to the maintenance operator by the inspection procedure generation unit a after reconstruction, and to present the inspection procedure to a diagnostic interface unit based on the priorities, wherein the failure knowledge data describes a failure candidate of the asset and a related phenomenon and describes a knowledge having a configuration in which structural and functional configurations of the asset have no inconsistency or duplication as a whole, wherein the instances of partial failure knowledge data include information regarding a target component of the asset, a failure mode, a failure cause causing the failure mode, and a failure effect due to the failure mode, wherein the failure knowledge coupling unit is configured to calculate a score indicating a coincidence between types of the nodes, and wherein the inspection procedure generation unit is configured to change the priorities based on degrees of enrichment of the instances of partial failure knowledge data.