The information processing device is equipped with: a reception unit for receiving, by being attached to a user's head, a detection value detected by a head-mounted device for detecting the flow rate of blood in the head, an identifier for a specific action performed by the user at the time of the detection of the detection value, and an identifier for the user； a storage unit for storing the received detection value, the identifier for the specific action, and the identifier for the user in a manner associated with one another； and a calculation unit for calculating, on the basis of the detection value stored in the storage unit, a brain activity value indicating a degree of the user's brain activity when the user performed the specific action.採用一種資訊處理裝置，具備接收部、記憶部和算出部，該接收部係接收透過被裝戴於利用者的頭部並針對前述頭部的血流量進行檢測的頭戴裝置而檢測出的檢測值、在檢測出前述檢測值時前述利用者所進行的既定行動的識別符、和前述利用者的識別符，該記憶部係將所接收的前述檢測值、前述既定行動的識別符、和前述利用者的識別符賦予對應而儲存，該算出部係根據儲存於前述記憶部的前述檢測值，而算出腦活動值，該腦活動值係顯示前述利用者進行前述既定行動時的前述利用者的腦活動的狀態的程度。
