A blood purification system comprising: a blood purification apparatus that gives blood purification treatment to a patient; a managing apparatus that communicates with the blood purification apparatus in such a manner as to transmit and receive information on the blood purification treatment to and from the blood purification apparatus, the managing apparatus including a storage unit that stores the information on the blood purification treatment in a time course with progress of the treatment and accumulates the information as a history for each treatment session; and a display unit provided to the blood purification apparatus or to the managing apparatus and that displays the information on the blood purification treatment, wherein the history includes events having occurred unsteadily in the blood purification treatment or a parameter related to the treatment and that changes with time during the blood purification treatment, and wherein the history includes warnings and notifications generated by the blood purification apparatus and a record of actions including a log of operations performed in response to the warnings and notifications, wherein the blood purification system further includes an extracting unit that searches the histories accumulated in the storage unit and extracts, as reference histories, a plurality of histories each including any of the events having occurred during a current session of blood purification treatment or a plurality of histories each including the parameter approximate to the parameter observed during the current session of blood purification treatment; a list-creating unit that creates a list of the plurality of reference histories extracted by the extracting unit; and a display control unit that controls the list created by the list-creating unit to be displayed on the display unit, characterized in that, on condition that any warning or notification is generated during the current session of blood purification treatment, the extracting unit is allowed to extract, as the reference histories, histories each including the warning or notification as an event and a record of actions including a log of operations performed in response to the warnings and notifications, wherein the extracted reference histories are included in the list to be created by the list-creating unit. a blood purification apparatus that gives blood purification treatment to a patient; a managing apparatus that communicates with the blood purification apparatus in such a manner as to transmit and receive information on the blood purification treatment to and from the blood purification apparatus, the managing apparatus including a storage unit that stores the information on the blood purification treatment in a time course with progress of the treatment and accumulates the information as a history for each treatment session; and a display unit provided to the blood purification apparatus or to the managing apparatus and that displays the information on the blood purification treatment, wherein the history includes events having occurred unsteadily in the blood purification treatment or a parameter related to the treatment and that changes with time during the blood purification treatment, and wherein the history includes warnings and notifications generated by the blood purification apparatus and a record of actions including a log of operations performed in response to the warnings and notifications, wherein the blood purification system further includes an extracting unit that searches the histories accumulated in the storage unit and extracts, as reference histories, a plurality of histories each including any of the events having occurred during a current session of blood purification treatment or a plurality of histories each including the parameter approximate to the parameter observed during the current session of blood purification treatment; a list-creating unit that creates a list of the plurality of reference histories extracted by the extracting unit; and a display control unit that controls the list created by the list-creating unit to be displayed on the display unit, characterized in that, on condition that any warning or notification is generated during the current session of blood purification treatment, the extracting unit is allowed to extract, as the reference histories, histories each including the warning or notification as an event and a record of actions including a log of operations performed in response to the warnings and notifications, wherein the extracted reference histories are included in the list to be created by the list-creating unit.