To guarantee to a user that a consigned package has not suffered any impact larger than a specified impact value.

The package 7 is mounted with an impact detector 9 having an impact sensor, and transported by a transport means 6. On this occasion, the impact detector 9 receives a limit value to impact on the package 7 specified by a user terminal 3 through a network 1 and transmitted from a server device 2 of a management service company through the network 1 and through a radio communication base station 5. The impact detector 9 produces alarm information based on the values of impact exerted on the package 7 and acquired by the impact sensor and on the specified limit value to impact. A worker can learn from the alarm information whether the package 7 has suffered an impact larger than the specified impact value or not, and when any alarm information is not produced, the worker can guarantee to the user that the package 7 has not suffered any impact larger than the specified impact value.