The present invention describes a standup assistance apparatus and method. According to one embodiment, a standup assistance apparatus includes a measurement unit, a detection unit and a determination unit. The measurement unit is configured to measure a center-of-gravity acceleration at which a position of a center-of-gravity of a subject moves. The detection unit is configured to detect whether or not buttocks of the subject contact a surface. The determination unit is configured to determine a standup ability of the subject in accordance with whether or not the buttocks contact the surface when the center-of-gravity acceleration reaches a first extreme value or a second extreme value which is a next extreme value of the first extreme value.