An operating status monitoring device detects execution of a machine instruction included in an execution module that is obtained by translating a source program into machine language, specifies a step in the source program corresponding to the detected machine instruction with reference to a definition list that stores correspondence between each step in the source program and a machine instruction in the execution module, updates a data table, which defines correspondence between a step position in the source program and the execution count of the step, by adding the execution count of the specified step in the data table, and outputs an operating status map in which execution count of each step can be visually recognized by arranging unit marks and by changing a displaying pattern of each unit mark in response to the execution count.