1. An operational assistance server device for providing operational assistance to a user operating an application, comprising: an operation table comprising previously defined (i) at least one operation on said application and (ii) at least one operation ID identifying at least one respective operation; an operation table storage unit for storing said operation table; at least one user's operation history consisting of at least one operation by said user; at least one operation sequence consisting of some of said at least one operation ID, generated by converting said at least one user's operation history into corresponding said at least one operation IDs with reference to said operation table; an operation sequence generation unit for generating said at least one operation sequence; an operation record storage unit for storing said at least one operation sequence generated by said operation sequence generation unit; at least one operation subsequence constituting said at least one operation sequence stored in said operation record storage unit; an appearing-operation-sequence extraction unit for extracting at least one appearing operation sequence from said at least one operation subsequence; and an appearing-operation-sequence storage unit for storing said at least one appearing operation sequences extracted by said appearing-operation-sequence extraction unit; wherein said at least one appearing operation sequence appears at a frequency higher than a predetermined value.