Abstract: A data recovery apparatus includes accepting unit configure to accept an instruction to recover data in a first storage device, generating unit configure to generate difference information describing differences between backup data backed up from the first storage device to a second storage device and data stored in the first storage device at the point in time when the data recovery instruction has been received by the accepting unit; and updating unit configure to update data stored in the first storage device on the basis of the difference information generated by the generating unit and the backup data.

Abstract: A method for seat reservation cancellation in a server that receives seat reservation applications including each number of seat from the first desired seat to the n-th desired seat (n is an integer not less than 2) comprises the step of, if any seat reservation cancellation occurs, comparing each number of seat from the first desired seat to the n-th desired seat in the seat reservation application with the number of seat of the canceled seat sequentially in order of receipt of the seat reservation applications, and then, if any seat reservation application wherein both numbers of seats match with each other is detected, assigning the number of seat of the canceled seat to the seat reservation application, whereby the method and a program for processing seat reservation cancellations that implement seat reservation in a so-called “first come, first served” manner so that, in other words, those who make seat reservations earlier can get more satisfactory seats, are provided.