To suitably determine a measurement cycle at which to measure cracks that occur in structures formed from concrete or the like. Resolution Means: A measurement cycle determination device (2) includes a related information acquisition unit (41) that acquires at least one of geographic information including items related to a geography of a site where a structure is located, weather information including items related to weather at the site, and structure information including items related to the structure; a crack information acquisition unit (42) that acquires crack information related to a crack that has occurred in the structure; a measurement cycle determination unit (44) that determines, on the basis of at least one of the geographic information, the weather information, the structure information, and the crack information, a measurement cycle at which to measure a width of the crack; and a measurement cycle output unit (46) that outputs a measurement cycle signal indicating measurement cycle information related to the determined measurement cycle.