A transaction reviewing system, comprising: a display screen; an image server configured to store video data from a plurality of cameras; characterized by further comprising a video reproduction device configured to: reproduce first video data acquired by a first camera positioned to capture aspects of a registration process conducted on a commodity sales register, of the plurality of cameras; reproduce second video data acquired by a second camera positioned to capture aspects of a settlement process conducted on a settlement apparatus, of the plurality of cameras as shifted by a first offset time from a start time of the first video data, the first offset time corresponding to an expected time for a user to move from the commodity sales register to the settlement apparatus; and reproduce third video data acquired by a third camera positioned to capture aspects of a packing process conducted in a commodity packing area, of the plurality of cameras as shifted by a second offset time from the start time of the first video data, the second offset time corresponding to an expected time for the user to move from the settlement apparatus to a commodity packing area, wherein at least parts of the first video data which indicate aspects of the registration process, of the second video data which indicate aspects of the settlement process, and of the third video data which indicate aspects of the packing process, related to one transaction, are reproduced simultaneously on the display screen. a display screen; an image server configured to store video data from a plurality of cameras; characterized by further comprising a video reproduction device configured to: reproduce first video data acquired by a first camera positioned to capture aspects of a registration process conducted on a commodity sales register, of the plurality of cameras; reproduce second video data acquired by a second camera positioned to capture aspects of a settlement process conducted on a settlement apparatus, of the plurality of cameras as shifted by a first offset time from a start time of the first video data, the first offset time corresponding to an expected time for a user to move from the commodity sales register to the settlement apparatus; and reproduce third video data acquired by a third camera positioned to capture aspects of a packing process conducted in a commodity packing area, of the plurality of cameras as shifted by a second offset time from the start time of the first video data, the second offset time corresponding to an expected time for the user to move from the settlement apparatus to a commodity packing area, wherein at least parts of the first video data which indicate aspects of the registration process, of the second video data which indicate aspects of the settlement process, and of the third video data which indicate aspects of the packing process, related to one transaction, are reproduced simultaneously on the display screen. reproduce first video data acquired by a first camera positioned to capture aspects of a registration process conducted on a commodity sales register, of the plurality of cameras; reproduce second video data acquired by a second camera positioned to capture aspects of a settlement process conducted on a settlement apparatus, of the plurality of cameras as shifted by a first offset time from a start time of the first video data, the first offset time corresponding to an expected time for a user to move from the commodity sales register to the settlement apparatus; and reproduce third video data acquired by a third camera positioned to capture aspects of a packing process conducted in a commodity packing area, of the plurality of cameras as shifted by a second offset time from the start time of the first video data, the second offset time corresponding to an expected time for the user to move from the settlement apparatus to a commodity packing area, wherein at least parts of the first video data which indicate aspects of the registration process, of the second video data which indicate aspects of the settlement process, and of the third video data which indicate aspects of the packing process, related to one transaction, are reproduced simultaneously on the display screen.