1. An image compression device using a prediction coding method, the image compression device comprising: plural types of predictors; plural types of quantizers; a global evaluation unit to perform a prediction for one line in an image to be compressed by using each of the plural types of predictors, and to determine one quantizer out of the plural types of quantizers based on a prediction error amount of a predictor having a smallest prediction error; a local evaluation unit to perform a prediction for a prescribed pixel block in the one line by using each of the plural types of predictors, and to identify one predictor out of the plural types of predictors based on a type of a predictor having a smallest prediction error; and a compression unit to compress data of the prescribed pixel block by using the predictor identified by the local evaluation unit and the quantizer determined by the global evaluation unit.