PROBLEM TO BE SOLVED: To provide an information processing program which uses the actually measured brain activity states of multiple users.SOLUTION: An information processing system comprises head-mounted devices and an information processing device. Each head-mounted device comprises: detection means which is mounted to the head of a user and detects a blood flow rate in the head and transfer means which transfers a value detected by the detection means to a predetermined transfer destination. The information processing device comprises: reception means which receives the detected values of the users transferred from the transfer means and calculation means which, on the basis of the received detected values of the users, calculates a calculated value indicating correlation of the characteristics of the detected values between the users.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】複数利用者の現実に測定された脳活動状態を利用する情報処理プログラム等を提供する。【解決手段】利用者の頭部に装着され、前記頭部の血流量を検出する検出手段と、前記検出手段による検出値を所定の転送先に転送する転送手段と、を有する頭部装着装置、および、前記転送手段から転送された、複数の前記利用者の検出値を受信する受信手段と、前記受信した複数の前記利用者の検出値に基づいて、前記利用者の間の検出値の特性の関連性を示す算出値を算出する算出手段と、を有する情報処理装置を備える情報処理システムとする。【選択図】図1